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Edwards Systems Technology
Edwards Systems Technology
Speaker
Application
Guide
Layout of Speakers for Adequate Fire Alarm Signaling and
Emergency Voice Communication
(c) 1995 Edwards Systems Technology
85000-0033 Issue 2
It is our intention to keep the product information current and
accurate. We can not cover specific applications or anticipate all
requirements. All specifications are subject to change without
notice. For more information or questions relative to this document
contact EST.
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Table of Contents
1 Foreword........................................................................................................................................... 1
2 Behavior of Sound ........................................................................................................................... 2
2.1 General...................................................................................................................................... 2
2.2 Measurement of Sound ............................................................................................................. 2
2.2.1 Reverberant Room Testing............................................................................................... 3
2.2.2 Anechoic Chamber Testing .............................................................................................. 4
2.3 Voice Tones and Speech ............................................................................................................ 5
2.4 Effect of Distance ..................................................................................................................... 6
2.5 Effect of Power (watts) ............................................................................................................. 6
3 Codes & Standards - Requirements ............................................................................................... 7
3.1 ANSI/NFPA 72 National Fire Alarm Code 1993...................................................................... 7
3.1.1 Audible Characteristics - Public Mode ............................................................................ 7
3.1.2 Audible Characteristics - Private Mode ........................................................................... 8
3.1.3 Sleeping Areas ................................................................................................................. 8
3.1.4 Locating Speakers ............................................................................................................ 8
3.2 ADA Americans with Disabilities Act ...................................................................................... 8
3.3 N.B.C. National Building Code of Canada (1995) ................................................................... 9
3.3.1 Alert and Alarm Signals - Audibility ............................................................................... 9
3.3.2 Temporal Pattern .............................................................................................................. 9
3.3.3 Sleeping Rooms ............................................................................................................. 10
3.3.4 Acoustic Measurement................................................................................................... 10
3.4 CAN/ULC S524 Standard for the Installation of Fire Alarm Systems ................................... 10
3.4.1 Locating Speakers .......................................................................................................... 11
4 Speaker Application ....................................................................................................................... 12
4.1 Design Guidelines - General ................................................................................................... 12
4.2 Design Reference: Typical Ambient Sound Levels ................................................................ 13
4.3 Speaker Power (Wattage Tap) Selection ................................................................................. 14
4.4 Wire Run Limitations ............................................................................................................. 16
4.4.1 Speaker Wiring Lengths - 25 VRMS ............................................................................. 16
4.4.2 Speaker Wiring Lengths - 70 VRMS ............................................................................. 17
4.5 EST Speakers - Typical Sound Patterns .................................................................................. 17
4.5.1 Single Speaker and Speaker/Strobe ............................................................................... 18
4.5.2 Two Ceiling Mounted Speakers and Speaker/Strobes ................................................... 21
4.5.3 Two Wall Mounted Speakers and Speaker/Strobes ........................................................ 24
4.5.4 Bi-directional (Back-to-Back) Speakers and Speaker/Strobes ...................................... 28
5 Speaker Application - Typical Layout Sketches .......................................................................... 33
5.1 Corridor - Ceiling or Wall Mount ........................................................................................... 34
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5.2 Corridor - Bi-directional Mount ............................................................................................. 35
5.3 Office ...................................................................................................................................... 36
5.4 Lobby ...................................................................................................................................... 37
5.5 Manufacturing......................................................................................................................... 38
5.6 High Ceilings - Ceiling Mount ............................................................................................... 39
5.7 Large Rooms with High Ceilings ........................................................................................... 40
5.8 Stairwell - Cone Speakers ....................................................................................................... 41
5.9 Parking Garage ....................................................................................................................... 42
6 Glossary .......................................................................................................................................... 43
7 APPENDICES ................................................................................................................................ 45
7.1 Appendix A - EST Speakers: Specifications and Performance .............................................. 45
7.1.1 4" Cone Speakers - 964 & 965 Series............................................................................ 46
7.1.2 4" Cone Speakers - 964 & 965 Series............................................................................ 47
7.1.3 4" Cone Speaker/Strobes - 964 & 965 Series ................................................................ 48
7.1.4 4" Cone Speaker/Strobes - 964 & 965 Series ................................................................ 50
7.1.5 4" Cone Speaker/Strobes - 765 & 767 Series ................................................................ 52
7.1.6 8" Cone Speakers - 964 & 965 Series............................................................................ 54
7.1.7 8" Cone Speakers - 964 & 965 Series............................................................................ 55
7.1.8 8" Cone Speaker/Strobes - 964 & 965 Series ................................................................ 56
7.1.9 8" Cone Speaker/Strobes - 964 & 965 Series ................................................................ 58
7.1.10 Re-entrant Speakers - 894B Series .............................................................................. 60
7.1.11 4" Cone Speakers - CSVT Series ................................................................................ 61
7.1.12 Re-entrant Speakers - CVT/CVTF Series.................................................................... 62
8 Acknowledgements ........................................................................................................................ 63
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1 Foreword
Fire alarm systems alert occupants of a building and inform them that an emergency exists. Usually the
intent is to initiate evacuation. In high rise buildings a voice communication system is provided to give
the occupants more information, such as the nature and location of the fire or instructions for
evacuation. The system fails to meet its goals if the signal is not heard and clearly understood by the
occupants.
.... Robert P. Schifiliti, P.E.
This application guide provides information on the placement/layout of EST speakers for adequate fire
alarm tone signaling and emergency voice communication. The suggested placement should provide
safe, adequate coverage. In certain cases, the speaker spacing can be stretched. However, many factors
affect the transmission and attenuation of sound as it travels from a source to a target. Some of these are:
- ambient temperature, humidity and air viscosity.
- signal or tone (sound) frequency.
- location of the sound source (speaker) relative to the target (ear).
- room construction and materials of walls, floors and ceilings.
- room furnishings in the signaling area.
All of these factors must be considered when designing or analyzing a signaling system. For
maximum safety, EST recommends that fire alarm strobes be used to supplement audible signals.
The following standards, codes, and guides are referenced in this document and should be used to
supplement information contained herein.
• ANSI/NFPA 72 National Fire Alarm Code - 1993 Edition
• UL 464 Audible Signal Appliances
• UL 1480 Speakers for Fire Protective Signaling Systems
• ADA(AG) Americans with Disabilities Act Accessibility Guidelines
• National Building Code of Canada - 1995 Edition
• CAN/ULC S525 Audible Signal Appliances for Fire Alarm Systems
• CAN/ULC S541 Standard for Speakers for Fire Alarm Systems
• CAN/ULC S524 M91 Standard for the Installation of Fire Alarm Systems
• ANSI A117.1 1992 Standard for Accessible and Usable Buildings and Facilities
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2 Behavior of Sound
2.1 General
In theory, sound waves generated from an ideal “point source” will spread out in all directions,
similar to the wave pattern generated by dropping a stone into water. Most sound generators are not
“point sources”, and most applications require that sound sources be directed or concentrated in one
or more directions. Cupped hands, megaphones or horn speakers are examples of how we can direct
sound.
Since sound travels through air in the form of quickly changing variations in air pressure, we speak
of the loudness of sound to be its “sound pressure level”, or SPL. The sound pressure level is
measured in dB (decibels). Since the loudest SPL which our ear can hear without damage is
1,000,000 times greater than the softest SPL, we use a logarithmic scale to help describe SPL in
numbers which we can more easily relate to.
Unfortunately, sound pressure decibels are not the scale that the human ear uses to judge loudness.
This is because our ears are generally more sensitive to higher frequencies. Sound with frequencies
between 1,000-6,000 Hz (Hz = “Hertz” = “cycles per second”) are the easiest to hear; sound with
lower frequencies are more difficult.
This “frequency selectivity” of the human ear is shown if a person hears three single frequency
sounds at 50, 500, and 5,000 Hz. When their strength is adjusted until they sound equally loud, you
will find that the 50 Hz sound must be 19 dB stronger than the 5,000 Hz sound, and 12 dB stronger
than the 500 Hz sound.
The threshold of audibility is 0 dB. It is the softest SPL that an average person could hear. A 3 dB
increase or decrease in the sound pressure level is “just noticeable” to the human ear. The
threshold of pain is 120 dB. The maximum sound level attainable under atmospheric
conditions is 194 dB.
2.2 Measurement of Sound
Two types of sound chambers are commonly used to determine a speaker’s sound level rating reverberant and anechoic. Sound pressure levels for audible fire alarm signals determined in a
reverberant room are typically lower than for the same sound source in an anechoic chamber. This is
because the reverberant results include an acoustic averaging of the response at all angles, whereas
the anechoic readings are typically taken on-axis which is usually defined as the angle of maximum
output.
Reverberant room sound levels describe the device operation as might be found in a large ‘live’ room
having several hard surfaces, where room reflections (reverberation) will be significant. Anechoic
readings in conjunction with polar plots provide an indication of the device’s operation in a fairly
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‘dead’ room, perhaps having curtains, soft wall covering, rugs, or many people. (People are
generally quite sound-absorbant.) In a ‘dead’ environment, sound reaches the occupants primarily
directly from the source, in which case it is important to note the signaling device’s polar output
relative to position within the room.
The dB sound pressure level can be measured with a sound level meter. It is very important to know
on what “scale” you are measuring.
Two scales commonly used are:
dB
- “flat” response measures sound intensity without regard to the characteristics of the ear.
dBA - a measurement where a filter is added to adjust the response (A-Weighting) to give greater
consideration to the sounds with frequencies between 5,000 and 10,000 Hz so that the
sound meter responds closer to the characteristics of the human ear.
The weighting of the various frequencies is established by an internationally accepted A-Weighting
curve. If a sound pressure level is expressed in dB rather than dBA, the corresponding
frequency must be given for it to have any meaning as far as perceived loudness is concerned.
For instance, a 1,000 Hz signal at 20 dB in a room with no background noise would be audible. A
100 Hz signal at 20 dB would not be heard. A-Weighting allows a single number to describe the
sound pressure level produced by a signal containing frequencies between 20 and 20,000 Hz. Hence,
a 200 Hz signal at 50 dBA would sound approximately as loud as a 10,000 Hz signal at
50 dBA.
2.2.1 Reverberant Room Testing
Reverberant room testing is used by ULI (Underwriter’s Laboratories, Inc. U.S.A.) as their
standard method of determining sound level for audible devices including fire alarm speakers.
This method employs a reverberant chamber and is specified in the ANSI S1.21 standard. This
concept of sound level testing is much different from anechoic testing. Here, an enclosed room is
used which has hard, sound reflecting walls in order to capture the total sound emitted from a
source.
Measurements are made using one or more microphones placed in specific locations in the
chamber or else swept through an arc inside the chamber. The “total” sound captured during the
measuring time is used to calculate sound power, from which the equivalent average sound
pressure level at 10 ft (3.05 m) is derived.
In most cases, EST publishes “Reverberant Room” values as confirmed through testing at UL’s
laboratories. What you need to realize, is that UL rates audible signal output in
predetermined 3 dBA steps or “milestones”. In the case of speakers, this is very important!
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UL’s confirmed speaker ratings begin at 75 dBA, and move in 3 dBA (usually upward) bench
marks, ie. 75, 78, 81, 84, 87, 90, 93 dBA etc. All speakers tested by UL will get one or more of
those dBA ratings. For example, if UL tests a speaker at its 2 watt tap and it consistently
achieves 89.9 dBA output, they would allow a published rating of only 87 dBA for that model.
Almost a full 3 dBA less than the speaker’s actual performance!
It’s essential to understand this especially when comparing the performance of two different
speakers. Here’s why:
Speaker:
UL Confirmed SPL Rating:
Actual UL SPL Test Result:
Model A
90
92.9
Model B
87
87.1
Model C
90
90.1
Model D
87
89.9
Model A vs Model B - UL says: 3 dBA difference; Actual: 5.8 dBA difference
Model C vs Model D - UL says: 3 dBA difference; Actual: 0.2 dBA difference
This also applies when testing speaker/strobes. Lets assume we test a speaker (without strobe),
then mount a strobe in front of the grille and re-test. If there is only a 1 dBA loss bringing the
speaker output just below a “milestone”, UL lowers the rating by a full 3 dBA. However,
there is no need to be overly concerned. A 3 dBA change in sound output, is really only “just
noticeable” to the human ear. Good end results are achieved with optimal product application,
not just by the product alone.
2.2.2 Anechoic Chamber Testing
Anechoic testing is used by ULC (Underwriter’s Laboratories of Canada) as their standard
method of determining sound level emitted from audible devices including fire alarm speakers.
As the word implies, anechoic (“allowing no echoes”) tests are performed in environments free
from echoes.
In most cases this would be a chamber typically having walls, ceilings and floor covered with
sound absorbent materials, often having conical or triangular shapes designed to trap the sound
waves. At times a remote outdoor location is found and the source and microphone are mounted
high above the ground. It is important to have no reflecting surfaces nearby.
In an anechoic environment, unlike a reverberant room, a sound pressure level meter placed at a
distance from the sound source will only measure the sound generated in that direction. Thus it
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is possible to measure the sound level at various angles off-axis from a given source, and
produce a “polar plot” to describe sound level versus listening angle. These polar plots are the
basis for the design examples used in this guide.
For speakers, we expect that the most demanding applications will require complex changing
wave forms such as speech. Polar plots at various high and low frequencies are therefore needed
to fully describe the speaker’s full polar behavior.
2.3 Voice Tones and Speech
Although 20 Hz to 20,000 Hz (wavelengths from 55 ft to 0.66 in long) is usually quoted as our
hearing range, most people cannot hear above approximately 16,000 Hz.
The human voice has most of its power in the 200 Hz to 3,000 Hz region. The voice frequencies
above 3,000 Hz contain very little energy. The frequencies in the 800 Hz to 3,000 Hz range
contribute the most to voice intelligibility. Audibility and intelligibility, however, are two
different issues.
Audibility usually refers to the ability to “hear” a particular signal over the ambient noise level.
This is often the foremost consideration in selection and placement of horn or bell signals.
Intelligibility usually refers to the ability to “understand” messages or instructions delivered by a
sound system, typically involving loudspeakers. Excessive reverberation or distortion can cause a
very loud, audible signal to be unintelligible.
If the average ambient noise level in a space is found to be 75 dBA, it might be concluded that the
alarm signal level throughout the area should be between 80 to 90 dBA. But to achieve that sound
level 25 feet (7.6 m) from a speaker, the level in the area very near or just below the speaker might be
as high as 100 to 110 dBA. That alarm signal level would be clearly audible, however, the high
sound level close to the speaker might be too loud. Certainly potential distortion and the effect of
reverberation may make a voice message unintelligible.
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2.4 Effect of Distance
Under the “Anechoic” condition (see Section 2.2.2 above), the sound pressure level will change
approximately 6 dBA for each halving or doubling of distance from the source to the target.
This can be shown as:
base distance x 0.5 = base sound level + 6 dBA
BASE DISTANCE x 1 = BASE SOUND LEVEL
base distance x 2 = base sound level - 6 dBA
base distance x 4 = base sound level - 12 dBA
base distance x 8 = base sound level - 18 dBA
base distance x 16 = base sound level - 24 dBA
The illustration below shows how the sound pressure level changes with distance under ideal
conditions. Sound absorbing or reflecting materials in the listening area can modify the curve.
2.5 Effect of Power (watts)
Doubling or halving the power input to a speaker causes an increase or decrease of 3 dBA. This is
very significant when calculating amplifier size for sound distribution systems. Each time the
amplifier size is doubled, the potential sound pressure level (SPL) output from speakers is increased
by only 3 dBA, a “just noticeable” rise.
This can be shown as:
base power x 0.5 = base sound level - 3 dBA
BASE POWER x 1 = BASE SOUND LEVEL
base power x 2 = base sound level + 3 dBA
base power x 4 = base sound level + 6 dBA
base power x 8 = base sound level + 9 dBA
base power x 16 = base sound level + 12 dBA
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3 Codes & Standards - Requirements
3.1 ANSI/NFPA 72 National Fire Alarm Code 1993
The following information is extracted in part from ANSI/NFPA 72. There are numerous reference
figures and tables which are part of NFPA 72. They must be used along with this guide.
Chapter 3 of NFPA 72 indicates that audible signals for a fire alarm system shall be distinctive in
sound from other signals and that this sound not be used for any other purpose. To meet this
requirement, effective July 01, 1996, the fire alarm signal used for evacuation purposes shall be
ANSI S3.41, American National Standard Audible Emergency Evacuation Signal.
Chapter 6 of NFPA 72 classifies audible notification signals for fire alarm systems for specific uses
and purposes. Properly applied, EST speakers can meet the criteria for all of the following:
Coded - An audible signal conveying several discrete bits or units of information. An example is
numbered strokes (or tones) of a bell, chime, horn or speaker.
Non-coded - An audible signal conveying one discrete bit of information.
Non-coded Perceptually Constant - The continuous operation of a signal such as a bell, horn, siren,
or speaker tone.
Non-coded Perceptually Repetitious - The interrupted operation of a signal such as a bell, horn,
siren, or speaker tone that is operated at a continuous uniform rate.
Textual - A voice message.
General/Notification - Audible signals used for alerting the general public or specific individuals
responsible for implementation and direction of emergency action.
Operating Mode, Private - Audible signaling only to those persons directly concerned with the
implementation and direction of emergency action initiation.
Operating Mode, Public - Audible signaling to occupants of the area protected by the fire alarm
system.
3.1.1 Audible Characteristics - Public Mode
The code stipulates that the alarm or alert sound level should be at least 15 dBA above the normal
ambient sound level or 5 dBA above the normal maximum sound level having a duration of at
least 60 seconds (whichever is greater), measured 5 ft (1.5 m) above the floor. In areas where the
average ambient sound level is greater than 115 dBA, visible signal appliances (strobes) must be
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used. (Note: See ADA - Section 3.2)
Speakers intended for use in the public mode must produce a minimum sound level of 75 dBA at
10 ft (3 m) and cannot exceed 130 dBA at the minimum hearing distance to the speaker.
(Note: ADA allows only 120 dBA. See Section 3.2)
3.1.2 Audible Characteristics - Private Mode
Speakers used for private mode operation must have a minimum sound level of 45 dBA at 10 ft
(3 m) and cannot exceed 130 dBA at the minimum hearing distance from the speaker. In areas
where the average ambient sound level is greater than 115 dBA, visible signal appliances
(strobes) must be used. (Note: ADA allows only 120 dBA. See Section 3.2)
3.1.3 Sleeping Areas
When speakers are used in sleeping areas, they shall provide sound levels at all points in the area,
a maximum of 15 dBA above the average ambient noise with a minimum of 70 dBA.
3.1.4 Locating Speakers
When Emergency Voice/Alarm Communication speakers are used, there must be at least two
speakers in each paging zone of the building, so located that signals can be clearly heard
regardless of the maximum noise level produced by machinery or other equipment. Each
elevator car must have a speaker connected to the paging zone in which that elevator is located.
Ceiling mount speakers are allowed. Where ceiling heights permit, wall mounted speakers shall
have their tops at heights above the floor of not less than 90 in. (2.3 m) and below the ceiling of
not less than 6 in. (0.15 m). When combination speaker/strobes are used, visible signal
(strobe) installation guidelines must be followed.
3.2 ADA Americans with Disabilities Act
The landmark Americans with Disabilities Act, enacted by US Congress on July 26, 1990, provides
comprehensive civil rights protection to individuals in the area of employment (title I), State and
local government services (title II), public accommodation and commercial facilities (title III),
telecommunications (title IV). Title III of the act affects fire alarm systems and compliance requires
that:
Audible Emergency Alarms shall produce a sound that exceeds the prevailing equivalent sound
level in the room or space by at least 15 dBA or exceeds any maximum sound level with a duration
of 60 seconds by 5 dBA, whichever is louder. Sound levels for alarm signals shall not exceed
120 dBA. Note: This is less than the 130 dBA allowed by NFPA.
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Since we must have signals at 15 dBA above ambient, but cannot exceed 120 dBA, strobes are
therefore required anywhere the ambient is more than 105 dBA.
Audible emergency signals must have an intensity and frequency that can attract the attention of
individuals who have partial hearing loss. People over 60 years of age generally have difficulty
perceiving frequencies higher than 10,000 Hz. An alarm signal which has a periodic element to its
signal such as single stroke bells (clang-pause-clang-pause), hi-low (up-down-up-down) and fast
whoop (low sweeping to high, low sweeping to high) are best. Avoid continuous or reverberating
tones. Select a signal which has a sound easily characterized by three or four clear tones.
3.3 N.B.C. National Building Code of Canada (1995)
In a 2-stage fire alarm system, the same audible signal devices (speakers) are permitted to be used to
sound the alert signals and the alarm signals. If speakers are intended for paging and similar voice
message use, other than during a fire emergency, they must be installed so that alert signals and
alarm signals take priority over all other signals. Speakers forming part of a fire alarm or voice
communication system can not be used for playing music or background noise.
3.3.1 Alert and Alarm Signals - Audibility
Fire alarm system speakers must be installed in a building so that alert signals, alarm signals and
voice messages can be heard intelligibly throughout the floor area in which they are installed.
The sound pressure level from a fire alarm audible signal device in a floor area used for
occupancies other than residential occupancies must be at least 10 dBA above the ambient noise
level, but never less than 65 dBA. The fire alarm signal sound pressure level cannot exceed
110 dBA in any normally occupied area.
In any floor area where the ambient noise level is more than 87 dBA, or where the occupants of
the floor area use ear protective devices, are located within an audiometric booth, or are located
within sound insulating enclosures, the fire alarm audible signal devices shall be supplemented
by visual signal devices (strobes). Strobes are also required in assembly occupancies where
music and other sounds associated with performances could exceed 100 dBA.
In a building or portion thereof intended for use primarily by persons with hearing impairments,
fire alarm strobes shall be installed in addition to audible signal devices.
3.3.2 Temporal Pattern
The temporal pattern of an alarm signal shall conform to the temporal pattern defined in
Clause 4.2 of International Standard ISO 8201: 1987(E), “Acoustics - Audible Emergency
Evacuation Signal”. EST speakers are very suitable for producing this signal pattern.
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This pattern relates to the time while the signal is produced and the intervals between the
individual signal pulses. The characteristic of the pattern is a three pulse phase followed by an
off phase.
The signals from smoke alarms and the temporal patterns of alert signals shall be sufficiently
different from the signals or patterns of alarm signals so that there is no possibility of confusion.
3.3.3 Sleeping Rooms
The sound pressure level in sleeping rooms from a fire alarm audible signal device shall not be
less than 75 dBA in buildings of residential occupancy when any intervening doors between the
device and the sleeping room are closed.
In buildings with more than one dwelling unit that are served by corridors, it might not be
possible to place a speaker in the corridor or hallway to alert persons sleeping in suites and
dwelling units, because the sound level very near the device would exceed 110 dBA. (See above,
Section 3.3.1) In those cases it will be necessary to supplement the building fire alarm system
with an audible signal device in the individual suite or dwelling unit. These latter devices could
be mini-horns or speakers, subject to the device emitting the appropriate temporal pattern
required. (See above, Section 3.3.2)
An audible signal device located within a dwelling unit shall incorporate a means that enables
the device to be silenced for a period of not more than 10 minutes after which the device shall
restore to normal operation. The intent here is to minimize the annoyance caused by false and
unwanted alarms. The silence feature will reduce the likelihood of tampering with the audible
devices.
An audible signal device located within a dwelling unit or suite of residential occupancy must be
connected to the fire alarm system in a manner that disconnection of, or damage to, that device
will not interfere with the ability of devices in other dwelling units or suites to sound an alarm.
3.3.4 Acoustic Measurement
Appendix A-3.2.4.19 of the building code (1995) covers details and methods which should be
used when measuring the ambient noise level and alarm signal sound pressure levels on the
project site. These procedures must be followed to obtain accurate measurements.
There is a rule of thumb expressed that if SPL measurements are made in a totally bare room, the
SPL will be about 3 dB higher than if the room were carpeted. In most cases this will account
for most of the absorption in the room and no further correction is necessary. Adding heavy
drapes and sound absorptive furnishings to carpeted room can reduce the sound level by a further
2-3 dB.
Portable partitions or office screens in commercial buildings can cause even greater reductions.
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3.4 CAN/ULC S524 M91 Standard for the Installation of Fire Alarm Systems
3.4.1 Locating Speakers
Audible signal appliances (speakers) must be mounted with the center of the appliance not less
than 1.8 m above the floor level. Audible signal appliances shall be mounted, in accordance with
the manufacturer’s instructions, in enclosures which are intended and accepted for the purpose.
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4 Speaker Application
Edwards Systems Technology recommends that audible signal appliances always be installed in
accordance with the latest recognized edition of national and local fire alarm codes. EST recognizes that
the following guidelines may differ from the current standards and practices in some jurisdictions. We
recommend, however, that wherever possible you follow the application information herein to help
ensure maximum safety.
EST audible voice/tone signal products meet or exceed the needs of most persons, if properly applied.
They are designed to comply with or exceed the following standards and regulations:
ANSI/NFPA 72 National Fire Alarm Code
ANSI A117.1 (1992) Standard for Accessible and Usable Buildings and Facilities
ADA(AG) Americans with Disabilities Act (Accessibility Guidelines)
UL 464 Audible Signal Appliances
UL 1480 Speakers for Fire Protective Signaling Systems
ULC S525 Audible Signal Appliances for Fire Alarm Systems
ULC S524 Standard for the Installation of Fire Alarm Systems
ULC S541 Standard for Speakers for Fire Alarm Systems
NOTE: Audible signal applications vary widely and at all times must be considered along with visible
signal requirements to determine exact signal appliance needs. Combination audible/visible signaling
appliances are available from EST and should be used wherever possible.
The Appendices at the end of this guide provide EST speaker engineering and performance
specifications. The information here is based on that performance.
4.1 Design Guidelines - General
To be intelligibly heard throughout the building, a sufficient quantity of speakers should be installed
in each area. Usually, better sound distribution results from carefully positioning a larger quantity of
speakers set on “lower” power taps than a lesser quantity of speakers set to their highest tap.
Modern buildings are constructed with improved sound insulation between corridors and occupied
areas. This results in poor sound penetration by corridor-mounted speakers. Sound penetration
through walls depends upon the type of wall construction and SPL losses will vary from 15 to 40
dBA. A solid door reduces the level of sound reaching the room by 25 to 30 dBA. Raising the
output level of corridor speakers enough to penetrate into rooms could result in corridor sound
pressure levels that cause discomfort to people in the corridor. A practical solution is to install
signals with lower power in all parts of the entire floor area.
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Depending on a room’s acoustic characteristics, doubling the distance from a speaker causes a
6 dBA reduction in the received sound pressure level. Curtains or drapes close to the speaker can
decrease the sound pressure level by 2-3 dB from that of a more reflective surface. Carpeting may
cause a reduction in the sound level of approximately 3 dB from that of a more reflective surface.
Cone speakers usually have a broader frequency range and higher fidelity (less distortion) than
re-entrant type speakers. They should be used for most applications. The re-entrant speaker should
be used in high ambient noise applications or in locations where it will be exposed to weather or dust
such as in parking garages or factories. The re-entrant speaker can handle up to 15 watts of power
with minimum distortion. The higher capability is often needed to overcome high
background noise.
Speaker “Phasing” - When connecting speakers to the fire alarm system, wiring polarity is
important. If polarity of connections is not consistent, the speakers will be out of “phase”. This
means that when one speaker is “pushing” the air, another speaker can be “pulling” the air. The
result is a cancelling affect on the sound output.
4.2 Design Reference: Typical Ambient Sound Levels
Here, we’ve listed some typical environments which most fire alarm system designers will
recognize and can easily relate to. This information is for reference only and should not to be used in
lieu of actual site condition sound level measurements.
Noisy Background (Conversation Difficult or Impossible)
Subway Train Loading Platform
90-95 dB
Airport Loading Ramp
90 dB
Medium Background (Voice Must Be Raised To Be Understood)
Computer Room
70-75 dB
Quiet Background (Normal Conversation Easily Understood)
Average Conversation Level - 3 ft (1 m) away
55 dB
Very Quiet Conversation
20 dB
Whisper Conversation
15 dB
Outdoors - Minimum in Country
8-10 dB
Speaker Application Guide
Edwards Systems Technology
Page 14
NFPA 72 lists some typical average ambient sound levels one might expect in various types of
occupancies.
Type of Location
Business Occupancies
Educational Occupancies
Industrial Occupancies
Institutional Occupancies
Mercantile Occupancies
Piers and Water Surrounded Structures
Places of Assembly
Residential Occupancies
Storage Occupancies
Thoroughfares, High Density Urban
Thoroughfares, Medium Density Urban
Thoroughfares, Rural and Suburban
Tower Occupancies
Underground Structures and Windowless Buildings
Vehicles and Vessels
Average Ambient Sound Level
55 dBA
45 dBA
80 dBA
50 dBA
40 dBA
40 dBA
55 dBA
35 dBA
30 dBA
70 dBA
55 dBA
40 dBA
35 dBA
40 dBA
50 dBA
4.3 Speaker Power (Wattage Tap) Selection
To determine the correct power tap to use on the speaker, measure the distance from the speaker’s
location to the area to be covered. Next, refer to the specification sheet for the speaker you intend to
use. Look for the sound pressure level the unit can provide at a given power input over a given
distance.
It should be clear now that each time you double the power to the speaker, you gain 3 dBA. This is a
“just noticeable” increase in volume. And, each time you double the distance from the speaker you
lose 6 dBA. Likewise, each time you halve the power, you reduce the sound level 3 dBA. And, each
time you halve the distance, you increase the sound by 6 dBA.
For each particular application, we need to determine whether fewer higher-powered, centralized
speakers, or more lower-powered, better distributed speakers are best.
Example #1
In many areas such as offices, corridors, or classrooms, an 80 dBA emergency paging signal is more
than sufficient to overcome normal ambient noise levels. In this example, the distance across the
protected area is 20 ft and our speakers are to be wall mounted. Our goal is to provide 80 dBA
minimum throughout the area, based on a 1,000 Hz signal.
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From their specifications in Section 7 - Appendix, we see that EST’s model 964-1A-4R produces
88 dBA at 10 ft (3.05 m) with 2 watts input. We know that when we double the distance, we lose
6 dBA. Therefore, at 20 ft (6.1 m) we could expect 88 - 6 = 82 dBA. This meets our target.
However, sometimes it is more desirable to use more than one speaker in an area, especially in very
large projects. Additionally, we know we can obtain better sound quality using multiple speakers.
The 964-1A-4R at 2 watts input provides 82 dBA at 20 ft (6.1 m). Each time we reduce speaker
power by one half, we decrease the sound pressure level from the speaker by only 3 dBA. So, we
can reduce the power to 1 watt to get 79 dBA, 1/2 watt for 76 dBA, and 1/4 watt for 73 dBA at 20 ft
(6.1 m).
At 1/2 watt, if we half the distance of coverage to only 10 ft (3.05 m), the result is 82 dBA (76 dBA +
6 dBA).
Two speakers mounted on opposite walls and set at 1/2 watt are also sufficient! By using two
speakers, we require only half the power. 1 watt of power (2 speakers at 1/2 watt each) obtains the
equivalent result of one speaker set at 2 watts. This could save amplifier costs! We also achieve
much better sound distribution throughout the protected area.
Example #2
In noisy areas (compressor rooms, machine shops, and general manufacturing areas), the sound level
produced by the speaker must overcome the area’s high ambient noise. This is usually best accomplished with a re-entrant speaker.
Let’s assume that the measured distance from the speaker location to the area to be covered is 40 ft
(12.2 m). Our project calls for 87 dBA minimum to be provided throughout the area. From their
specifications in Section 7 - Appendix, EST’s model (USA: 894B-004/Canada: CVT-157UCR)
produces 99 dBA at 10 ft (3.05 m) with 15 watts input based on a 1,000 Hz tone.
So, beginning at 10 ft (3.05 m), we subtract 6 dBA each time we double the distance. In this instance
we have (at 15 watts): 99 dBA at 10 ft (3.05 m), 93 dBA at 20 ft (6.1 m), 87 dBA at 40 ft (12.2 m).
This seems adequate; our goal is 87 dBA.
However, the 99 dBA (at 15 watts) emitted by the re-entrant speaker would cause discomfort for
anyone who might be located close to the speaker. To correct this, we need to decrease the speaker’s
power.
Since at 15 watts we have 87 dBA at 40 ft (12.2 m), reducing the power to 8 watts produces 84 dBA,
4 watts 81 dBA, and at 2 watts we have 79 dBA. At 4 watts and at half the distance (20 ft
(6.1 m)), we can expect 87 dBA (81 dBA + 6 dBA). This is also sufficient assuming we locate 2
speakers on opposite sides of the area.
Speaker Application Guide
Edwards Systems Technology
Page 16
NOTE: We have accomplished our goal without causing discomfort to people who may be standing
near the speaker. We provided smoother area coverage. And we use 8 watts of power (2 speakers at
4 watts each) instead of 15 watts. THIS SAVES AMPLIFIER COSTS!
4.4 Wire Run Limitations
Power loss in a speaker circuit is just like line loss in a bell circuit. The same questions apply to
both. What is the length of the circuit? What size of wire is used? How many speakers are on the
circuit and what is the wattage (power tap setting) of those speakers?
The following charts show the normally accepted limits of the variables to ensure that each speaker
operates to its full potential.
NOTES:
1. For each speaker zone, select total zone power.
2. Distance shown is calculated to the last speaker, based on the worst case, assuming all speakers
are lumped at the end. Sometimes, adjusting (raising) the wattage tap on the last few speakers
on a wire run can help compensate for line loss.
4.4.1 Speaker Wiring Lengths - 25 VRMS
ALLOWABLE LENGTH (FEET) FOR 25 VRMS AUDIO CIRCUITS WITH 0.5dB (12.5%) LOSS
WIRE
RESISTANCE
NOMINAL POWER IN LOAD (load impedance ohms)
SIZE
PER 1000' PAIR
10W
15W
20W
30W
40W
(AWG)
(OHMS)
(61)
(41)
(31)
(20)
(15)
12
3.2
1130
775
575
390
290
14
5.2
700
475
350
240
175
16
8.0
450
300
225
150
110
18
13.0
290
190
140
95
70
50W
(12.5)
230
140
90
57
ALLOWABLE LENGTH (FEET) FOR 25 VRMS AUDIO CIRCUITS WITH 1.0dB (25%) LOSS
WIRE
RESISTANCE
NOMINAL POWER IN LOAD (load impedance ohms)
SIZE
PER 1000' PAIR
10W
15W
20W
30W
40W
(AWG)
(OHMS)
(61)
(41)
(31)
(20)
(15)
12
3.2
2260
1550
1150
780
580
14
5.2
1400
950
700
480
350
16
8.0
900
600
450
300
220
18
13.0
580
380
280
190
140
50W
(12.5)
460
280
180
114
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Edwards Systems Technology
4.4.2 Speaker Wiring Lengths - 70 VRMS
ALLOWABLE LENGTH (FEET) FOR 70 VRMS AUDIO CIRCUITS WITH 0.5dB (12.5%) LOSS
WIRE
RESISTANCE
NOMINAL POWER IN LOAD (load impedance ohms)
SIZE
PER 1000' PAIR
10W
15W
20W
30W
40W
60W
100W
(AWG)
(OHMS)
(490)
(327)
(245)
(163)
(122)
(81)
(49)
10
2.0
9900
7300
5000
3700
2500
1450
12
3.2
9100
6200
4600
3100
2300
1600
910
14
5.2
5600
3800
2800
1900
1400
950
560
16
8.0
3600
2400
1800
1200
900
600
370
18
13.0
2300
1500
1100
750
560
370
230
ALLOWABLE LENGTH (FEET) FOR 70 VRMS AUDIO CIRCUITS WITH 1.0dB (25%) LOSS
WIRE
RESISTANCE
NOMINAL POWER IN LOAD (load impedance ohms)
SIZE
PER 1000' PAIR
10W
15W
20W
30W
40W
60W
100W
(AWG)
(OHMS)
(490)
(327)
(245)
(163)
(122)
(81)
(49)
10
2.0
19800
14600
10000
7400
5000
2900
12
3.2
18200
12400
9200
6200
4600
3200
1820
14
5.2
11200
7600
5600
3800
2800
1900
1120
16
8.0
7200
4800
3600
2400
1800
1200
740
18
13.0
4600
3000
2200
1500
1120
740
460
200W
(24.5)
730
460
280
180
200W
(24.5)
1460
920
560
360
4.5 EST Speakers - Typical Sound Patterns
The speaker performance illustrated here is based on sound pressure level measurements made in an
anechoic chamber at a 10 ft (3.05 m) distance with a 1,000 Hz signal. Losses or gains caused by
room construction and materials in the space are not taken into account.
The speaker sound patterns shown represent the general sound dispersion only. The actual speaker
dispersion angle for EST speakers is defined as the angle for which sound is within 6 dBA of the
on-axis (directly in front/0 degrees) sound pressure level (SPL) at 1,000 Hz.
While the 8 inch speaker is more directional at 1,000 Hz, it should be noted that this particular
speaker has higher output at 1,000 Hz and also superior low frequency response than the 4 inch
speaker shown. The 4 inch speaker may be more cost effective. Thus, depending on the type of
alarm sound used and budget considerations, one may prefer either speaker for an application.
Speaker Application Guide
Edwards Systems Technology
4.5.1 Single Speaker and Speaker/Strobe
4 Inch Cone Speaker - EST Catalog 965 & 964 series
1,000 Hz Tone; 2 Watt Tap; sound dispersion pattern is symmetrical.
4 Inch Cone Speaker/Strobe - EST Catalog 965 & 964 series (USA Only)
1,000 Hz Tone; 2 Watt Tap; sound dispersion pattern is symmetrical.
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4 Inch Cone Speaker/Strobe - EST Catalog 765 & 767 series (USA Only)
1,000 Hz Tone; 2 Watt Tap; sound dispersion pattern is symmetrical.
4 Inch Cone Speaker - EST Catalog CSVT series (Canada Only)
1,000 Hz Tone; 7.5 Watt Tap; sound dispersion pattern is symmetrical.
Speaker Application Guide
Edwards Systems Technology
8 Inch Cone Speaker - EST Catalog 965 & 964 series
1,000 Hz Tone; 4 Watt Tap; sound dispersion pattern is symmetrical.
8 Inch Cone Speaker/Strobe - EST Catalog 965 & 964 series
1,000 Hz Tone; 4 Watt Tap; sound dispersion pattern is symmetrical.
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Re-entrant Speaker - EST Catalog 894B Series/CVT series
1,000 Hz Tone; 15 Watt Tap; sound dispersion pattern is symmetrical.
4.5.2 Two Ceiling Mounted Speakers and Speaker/Strobes
Perhaps the simplest multiple-speaker situation occurs with two ceiling mounted speakers. The
application could be a hallway or small room. These diagrams display the general effect expected from two ceiling-mounted units.
When calculating the sound pressure level (SPL) between multiple speakers, sometimes assumptions must be made regarding the output of a speaker at a particular angle. For example, we may
need to know the speaker’s output at 25 degrees off-axis. But we only have information at 20
degrees and 30 degrees. Depending on how we interpolate and round-off our numbers, we could
get SPL values which vary by +/- 1 dBA. Calculations made to within 1 or 2 dBA of actual
installed performance are generally quite acceptable.
All examples shown here use 30 ft (9.1 m) speaker spacing. Wattage tap selection on each
speaker will vary the dBA output as shown in the tables. All situations other than open-fields or
anechoic chambers (in other words, most actual usages) will experience sound level gains due to
reflections from walls, floors and other surfaces in the sound space.
Speaker Application Guide
Edwards Systems Technology
Page 22
4" Cone Speakers - EST Catalog 965 & 964 series
30 ft (9.1 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 73 dBA
1/2w = 76 dBA
1w = 79 dBA
2w = 82 dBA
4" Cone Speaker/Strobes - EST Catalog 965 & 964 series (USA Only)
30 ft (9.1 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 68 dBA
Speaker Application Guide
1/2w = 71 dBA
1w = 74 dBA
2w = 77 dBA
Page 23
Edwards Systems Technology
4" Cone Speaker/Strobes - EST Catalog 765 & 767 series (USA Only)
30 ft (9.1 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 70 dBA
1/2w = 73 dBA
1w = 76 dBA
2w = 79 dBA
8" Cone Speakers - EST Catalog 965 & 964 series
30 ft (9.1 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 75 dBA
1w = 78 dBA
2w = 81 dBA
4w = 84 dBA
Speaker Application Guide
Edwards Systems Technology
Page 24
8" Cone Speaker/Strobes - EST Catalog 965 & 964 series
30 ft (9.1 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 67 dBA
1w = 70 dBA
2w = 73 dBA
4w = 76 dBA
4.5.3 Two Wall Mounted Speakers and Speaker/Strobes
This condition shows two speakers wall mounted opposite from each other. In all cases, the
speakers are mounted at a typical height of 8 ft (2.4 m) and the sound pressure level is considered
at a height of 5 ft (1.5 m) above the floor.
The maximum recommended distance between cone type speakers is 60 ft (18.2 m) for these
conditions. When using EST re-entrant type speakers, even greater distances and higher dB
levels between speakers are possible.
As illustrated, EST’s 965 & 964 series 4 inch cone speakers can easily provide over 75 dBA
throughout the space when set at 1 watt input power.
Speaker Application Guide
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Edwards Systems Technology
4" Cone Speakers - EST Catalog 965 & 964 series
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 71 dBA
1/2w = 74 dBA
1w = 77 dBA
2w = 80 dBA
4" Cone Speakers - EST Catalog CSVT series (Canada Only)
80 ft (24.4 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 74 dBA
1w = 77 dBA
2w = 80 dBA
4w = 83 dBA
7.5w = 86 dBA
Speaker Application Guide
Edwards Systems Technology
Page 26
4" Cone Speaker/Strobes - EST Catalog 965 & 964 series (USA Only)
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 67 dBA
1/2w = 70 dBA
1w = 73 dBA
2w = 76 dBA
4" Cone Speaker/Strobes - EST Catalog 765 & 767 series (USA Only)
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 69 dBA
Speaker Application Guide
1/2w = 72 dBA
1w = 75 dBA
2w = 78 dBA
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Edwards Systems Technology
8" Cone Speakers - EST Catalog 965 & 964 series
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 76 dBA
1w = 79 dBA
2w = 82 dBA
4w = 85 dBA
8" Cone Speaker/Strobes - EST Catalog 965 & 964 series
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 70 dBA
1w = 73 dBA
2w = 76 dBA
4w = 79 dBA
Speaker Application Guide
Edwards Systems Technology
Page 28
Re-entrant Speakers - EST Catalog 894B Series/CVT series
80 ft (24.4 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
2w = 78 dBA
4w = 81 dBA
8w = 84 dBA
15w = 87 dBA
4.5.4 Bi-directional (Back-to-Back) Speakers and Speaker/Strobes
Often, speakers are hung back-to-back, especially along a long hallway. It appears that there is a
region of low sound level beneath the speakers. From information contained in Section 7 Appendix, we see that most speakers have less than a 10 dBA drop in sound output at 90 degrees
off-axis from their on-axis (0 degrees) SPLs.
Since the CSVT is rated to produce 88 dBA at 10 ft (3.05 m) on-axis at 1 watt, then we can
expect no less than 78 dBA beneath a speaker. In fact, since two speakers are sounding together,
the sound level at the center beneath them will be increased by 3 dBA to 81 dBA. Likewise, the
894B Series/CVT series is rated at 99 dBA on-axis. Therefore we’d expect 89 dBA minimum
beneath one speaker and 92 dBA beneath the pair. So, closeness to the speaker offsets the
concern of speaker dispersion angle.
Speaker Application Guide
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Edwards Systems Technology
4" Cone Speakers - EST Catalog 965 & 964 series
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 71 dBA
1/2w = 74 dBA
1w = 77 dBA
2w = 80 dBA
4" Cone Speakers - EST Catalog CSVT series (Canada Only)
80 ft (24.4 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 74 dBA
1w = 77 dBA
2w = 80 dBA
4w = 83 dBA
7.5w = 86 dBA
Speaker Application Guide
Edwards Systems Technology
Page 30
4" Cone Speaker/Strobes - EST Catalog 965 & 964 series (USA Only)
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 67 dBA
1/2w = 70 dBA
1w = 73 dBA
2w = 76 dBA
4" Cone Speaker/Strobes - EST Catalog 765 & 767 series (USA Only)
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/4w = 69 dBA
Speaker Application Guide
1/2w = 72 dBA
1w = 75 dBA
2w = 78 dBA
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Edwards Systems Technology
8" Cone Speakers - EST Catalog 965 & 964 series
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 76 dBA
1w = 79 dBA
2w = 82 dBA
4w = 85 dBA
8" Cone Speaker/Strobes - EST Catalog 965 & 964 series
60 ft (18.2 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
1/2w = 70 dBA
1w = 73 dBA
2w = 76 dBA
4w = 79 dBA
Speaker Application Guide
Edwards Systems Technology
Page 32
Re-entrant Speakers - EST Catalog 894B Series/CVT series
80 ft (24.4 m) between Speakers; 1,000 Hz Tone; minimum dBA measured 5 ft (1.5 m) above
floor
2w = 78 dBA
Speaker Application Guide
4w = 81 dBA
8w = 84 dBA
15w = 87 dBA
Edwards Systems Technology
Page 33
5 Speaker Application - Typical Layout Sketches
The placement of speakers shown in the following sketches is for emergency voice/tone communication
applications only; not visible signal (strobe) requirements. EST suggests you perform separate audible
and visible signaling requirements analysis. Only then can you determine exactly where combination
audible/visible signaling appliances can be installed.
Whenever more than one speaker sounds in an area, the effect from each speaker must be accounted for.
If there are two speakers equally contributing to an area, then the sound power is effectively doubled.
This results in an increase of 3 dBA. For example, if Speaker A produces 82 dBA + Speaker B
produces 82 dBA, then the result SPL = 85 dBA.
If two sources producing different SPL outputs are combined, the result can be determined using the
following chart.
Difference in dBA between two contributing
speakers
0
1
2
3
4
5
6
7
8
9
10
Incremental dBA to be added to the output from
the higher dBA source
3.0
2.5
2.0
1.8
1.5
1.2
1.0
0.8
0.6
0.5
0.4
For example, if Speaker A produces 82 dBA + Speaker B produces 77 dBA (a difference of 5 dBA, then
the result SPL = 82 + 1.2 = 83.2 dBA.
These typical layouts show suggested spacing for EST speaker products only and are based on the
following assumptions:
1. All sketches represent rooms with 10 ft (3.05 m) ceilings, unless noted.
2. All layouts are based on sound pressure level measurements made in an anechoic chamber (without
echoes). Acoustic losses or gains caused by room construction and materials in the space are not
taken into account.
3. All speakers are installed with baffles and grilles as supplied by EST. The speakers are installed
with back boxes as recommended or supplied by EST.
Speaker Application Guide
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5.1 Corridor - Ceiling or Wall Mount
Speaker layout for corridors is an application of the ceiling mounted, wall mounted or bi-directional
mounted speaker situations discussed in Section 4.5. In practice, there is a “rule of thumb” which
says that ceiling mounted speakers need to be mounted at a distance apart which is 3 times the floorto-ceiling height.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Suggested Spacing Criteria: Maximum 10 ft (3.05 m) from Walls, Maximum 30 ft (9.1 m) Spacing
Type of EST Speaker or
SPL/Wattage Tap
Speaker /Strobe
4" Cone Speaker
1/4w = 73 dBA, 1/2w = 76 dBA
964 & 965 series
1w = 79 dBA, 2w = 82 dBA
4" Cone Speaker/Strobe
1/4w = 68 dBA, 1/2w = 71 dBA
964 & 965 series
1w = 74 dBA, 2w = 77 dBA
4" Cone Speaker/Strobe
1/4w = 70 dBA, 1/2w = 73 dBA
765 & 767 series
1w = 76 dBA, 2w = 79 dBA
8" Cone Speaker
1/2w = 75 dBA, 1w = 78 dBA
964 & 965 series
2w = 81 dBA, 4w = 84 dBA
8" Cone Speaker/Strobe
1/2w = 67 dBA, 1w = 70 dBA
964 & 965 series
2w = 73 dBA, 4w = 76 dBA
Speaker Application Guide
Edwards Systems Technology
Page 35
5.2 Corridor - Bi-directional Mount
Suspended or wall-hung re-entrant speakers can achieve recommended maximum spacings of up to
80 ft (24.3 m) between units. This makes these speakers and method of installation ideal for very
long corridors or high ambient noise areas.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Type of EST Speaker or
Speaker /Strobe
4" Cone Speaker
964 & 965 series
4" Cone Speaker
CSVT series
4" Cone Speaker/Strobe
964 & 965 series
4" Cone Speaker/Strobe
765 & 767 series
8" Cone Speaker
964 & 965 series
8" Cone Speaker/Strobe
964 & 965 series
Re-entrant Speaker
894B Series/CVT series
Speaker Application Guide
SPL/Wattage Tap
Suggested Spacing Criteria
1/4w = 71 dBA, 1/2w = 74 dBA
1w = 77 dBA, 2w = 80 dBA
1/2w = 74 dBA, 1w = 77 dBA
2w = 80 dBA, 4w = 83 dBA, 7.5w = 86 dBA
1/4w = 67 dBA, 1/2w = 70 dBA
1w = 73 dBA, 2w = 76 dBA
1/4w = 69 dBA, 1/2w = 72 dBA
1w = 75 dBA, 2w = 78 dBA
1/2w = 76 dBA, 1w = 79 dBA
2w = 82 dBA, 4w = 85 dBA
1/2w = 70 dBA, 1w = 73 dBA
2w = 76 dBA, 4w = 79 dBA
2w = 78 dBA, 4w = 81 dBA
8w = 84 dBA, 15w = 87 dBA
Maximum 20 ft (6.1 m) from Walls,
Maximum 60 ft (18.2 m) Spacing
Maximum 30 ft (9.1 m) from Walls,
Maximum 80 ft (24.3 m) Spacing
Maximum 20 ft (6.1 m) from Walls,
Maximum 60 ft (18.2 m) Spacing
Maximum 20 ft (6.1 m) from Walls,
Maximum 60 ft (18.2 m) Spacing
Maximum 20 ft (6.1 m) from Walls,
Maximum 60 ft (18.2 m) Spacing
Maximum 20 ft (6.1 m) from Walls,
Maximum 60 ft (18.2 m) Spacing
Maximum 30 ft (9.1 m) from Walls,
Maximum 80 ft (24.3 m) Spacing
Page 36
Edwards Systems Technology
5.3 Office
Most modern offices consist of divided open space having approximately 10 ft (3.05 m) ceiling
heights. Best coverage is usually with ceiling mounted cone speakers. Although the recommended
spacing is the same for both 4 inch and 8 inch speakers, the “audio quality characteristics” for the
two speakers will be different under the same ambient conditions. The 8 inch speaker can be tapped
up to 4 watts, if desired.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Suggested Spacing Criteria: Maximum 10 ft (3.05 m) from Walls, Maximum 30 ft (9.1 m) Spacing
Type of EST Speaker or
SPL/Wattage Tap
Speaker /Strobe
4" Cone Speaker
1/4w = 73 dBA, 1/2w = 76 dBA
964 & 965 series
1w = 79 dBA, 2w = 82 dBA
4" Cone Speaker/Strobe
1/4w = 68 dBA, 1/2w = 71 dBA
964 & 965 series
1w = 74 dBA, 2w = 77 dBA
8" Cone Speaker
1/2w = 75 dBA, 1w = 78 dBA
964 & 965 series
2w = 81 dBA, 4w = 84 dBA
8" Cone Speaker/Strobe
1/2w = 67 dBA, 1w = 70 dBA
964 & 965 series
2w = 73 dBA, 4w = 76 dBA
Speaker Application Guide
Edwards Systems Technology
Page 37
5.4 Lobby
Often, lobbies feature a combination of high and low ceilings, irregular shapes, and open spaces.
Speaker choice and placement should direct sound toward areas where people traffic is expected.
Here, we see two wall mounted speakers intended for sound coverage at the front desk and stairway
areas. Similar results can be expected from ceiling mounted speakers.
Although the recommended spacing is the same for both 4 inch and 8 inch speakers, the “audio
quality characteristics” for the two speakers will be different under the same ambient conditions.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Suggested Spacing Criteria: Maximum 10 ft (3.05 m) from Walls, Maximum 30 ft (9.1 m) Spacing
Type of EST Speaker or
SPL/Wattage Tap
Speaker /Strobe
4" Cone Speaker
1/4w = 73 dBA, 1/2w = 76 dBA
964 & 965 series
1w = 79 dBA, 2w = 82 dBA
4" Cone Speaker/Strobe
1/4w = 68 dBA, 1/2w = 71 dBA
964 & 965 series
1w = 74 dBA, 2w = 77 dBA
4" Cone Speaker/Strobe
1/4w = 70 dBA, 1/2w = 73 dBA
765 & 767 series
1w = 76 dBA, 2w = 79 dBA
8" Cone Speaker
1/2w = 75 dBA, 1w = 78 dBA
964 & 965 series
2w = 81 dBA, 4w = 84 dBA
8" Cone Speaker/Strobe
1/2w = 67 dBA, 1w = 70 dBA
964 & 965 series
2w = 73 dBA, 4w = 76 dBA
Speaker Application Guide
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Edwards Systems Technology
5.5 Manufacturing
In many manufacturing areas, higher ambient noise levels are routine. Speakers such as re-entrant
type, with high wattage taps making them capable of higher SPLs are normally used. Ceiling
mounting is not usually advantageous due to obstructions, pipes, and lack of a ceiling tile system.
Speakers mounted on walls and structural columns are recommended.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Type of EST Speaker or
Speaker /Strobe
Re-entrant Speaker
894B Series/CVT series
SPL/Wattage Tap
Suggested Spacing Criteria
2w = 84 dBA, 4w = 87 dBA
8w = 90 dBA, 15w = 93 dBA
Maximum 10 ft (3.05 m) above Floor,
Maximum 40 ft (12.2 m) Spacing in ALL
directions, Maximum 20 ft (6.1 m) from
End Wall
Speaker Application Guide
Edwards Systems Technology
Page 39
5.6 High Ceilings - Ceiling Mount
In some cases, the greater distance from speakers to listeners may require higher power to provide
sound pressure levels that are at least 15 dBA over ambient levels. Thus, 965 & 964 series 8 inch
speakers having 4 watt capability are suggested.
This layout is based on a 20 ft (6.1 m) high ceiling. Wall mounted strobes are recommended.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Type of EST Speaker or
Speaker /Strobe
8" Cone Speaker
964 & 965 series
Speaker Application Guide
SPL/Wattage Tap
Suggested Spacing Criteria
1/2w = 72 dBA, 1w = 75 dBA
2w = 78 dBA, 4w = 81 dBA
Maximum 10 ft (3.05 m) from Walls,
Maximum 30 ft (9.1 m) Spacing
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Edwards Systems Technology
5.7 Large Rooms with High Ceilings
Sometimes, depending on floor and wall covering materials, confusing sound reflections are possible. In this case consider closer spacing than usual, wall mounted. Locate speakers exactly opposite one another on both sides of the room.
In these types of applications, SPLs near the center of the room are usually higher than those around
perimeter. This layout is based on a 20 ft 6.1 m) high ceiling.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Suggested Spacing Criteria: Maximum 10 ft (3.05 m) above Floor, Maximum 60 ft (18.2 m) Room Width, Maximum 40 ft
(12.2 m) Spacing along Wall, Maximum 15 ft (4.6 m) from End Wall
Type of EST Speaker or
SPL/Wattage Tap
Speaker /Strobe
4" Cone Speaker
1/4w = 70 dBA, 1/2w = 73 dBA
964 & 965 series
1w = 76 dBA, 2w = 79 dBA
4" Cone Speaker
1/2w = 71 dBA, 1w = 74 dBA
CSVT series
2w = 77 dBA, 4w = 80 dBA, 7.5w = 83 dBA
4" Cone Speaker/Strobe
1/4w = 66 dBA, 1/2w = 69 dBA
964 & 965 series
1w = 72 dBA, 2w = 75 dBA
4" Cone Speaker/Strobe
1/4w = 67 dBA, 1/2w = 70 dBA
765 & 767 series
1w = 73 dBA, 2w = 75 dBA
8" Cone Speaker
1/2w = 72 dBA, 1w = 75 dBA
964 & 965 series
2w = 78 dBA, 4w = 81 dBA
8" Cone Speaker/Strobe
1/2w = 64 dBA, 1w = 67 dBA
964 & 965 series
2w = 70 dBA, 4w = 73 dBA
Re-entrant Speaker
2w = 81 dBA, 4w = 84 dBA
894B Series/CVT series
8w = 87 dBA, 15w = 90 dBA
Speaker Application Guide
Edwards Systems Technology
Page 41
5.8 Stairwell - Cone Speakers
Normally, surface mounted enclosures are used here. We recommend 964/965 series (Square
Speakers) or the 765/767 series.
1,000 Hz Tone; dBA measured in Stairwell
Suggested Spacing Criteria: 1 Speaker at each Floor
Type of EST Speaker or
Speaker /Strobe
4" Cone Speaker
964 & 965 series
4" Cone Speaker
CSVT series
4" Cone Speaker/Strobe
964 & 965 series
4" Cone Speaker/Strobe
765 & 767 series
8" Cone Speaker
964 & 965 series
8" Cone Speaker/Strobe
964 & 965 series
Re-entrant Speaker
894B Series/CVT series
Speaker Application Guide
SPL/Wattage Tap
1/4w = 73 dBA, 1/2w = 74 dBA
1w = 77 dBA, 2w = 80 dBA
1/2w = 72 dBA, 1w = 74 dBA
2w = 78 dBA, 4w = 81 dBA, 7.5w = 84 dBA
1/4w = 66 dBA, 1/2w = 69 dBA
1w = 72 dBA, 2w = 75 dBA
1/4w = 68 dBA, 1/2w = 71 dBA
1w = 74 dBA, 2w = 77 dBA
1/2w = 73 dBA, 1w = 76 dBA
2w = 79 dBA, 4w = 82 dBA
1/2w = 65 dBA, 1w = 68 dBA
2w = 71 dBA, 4w = 74 dBA
2w = 81 dBA, 4w = 84 dBA
8w = 87 dBA, 15w = 90 dBA
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Edwards Systems Technology
5.9 Parking Garage
Parking garage installations can require speakers rated for outdoor use and high sound levels to
overcome ambient noise. Intelligibility can be difficult due to echoes caused by highly sound
reflective surfaces. Usually more speakers at moderate volumes spaced closer to listeners can be
more effective than a few very loud units.
1,000 Hz Tone; dBA measured 5 ft (1.5 m) above floor
Type of EST Speaker or
Speaker /Strobe
4" Cone Speaker
CSVT series
SPL/Wattage Tap
Suggested Spacing Criteria
1/2w = 74 dBA, 1w = 77 dBA
2w = 80 dBA, 4w = 83 dBA, 7.5w = 86 dBA
Re-entrant Speaker
894B Series/CVT series
2w = 84 dBA, 4w = 87 dBA
8w = 90 dBA, 15w = 93 dBA
Maximum 10 ft (3.05 m) above Floor,
Maximum 40 ft (12.2 m) Spacing in ALL
directions, Maximum 20 ft (6.1 m) from
End Wall
Maximum 10 ft (3.01 m) above Floor,
Maximum 40 ft (12.2 m) Spacing in ALL
directions, Maximum 20 ft (6.1 m) from
End Wall
Speaker Application Guide
Edwards Systems Technology
Page 43
6 Glossary
Articulation Index - A weighted fraction representing, for a given speech channel and noise condition,
the effective proportion of the normal speech signal that is available to the listener for conveying speech
intelligibility.
Audible - A signal is usually considered to be clearly audible if the A-weighted sound level exceeds the
level of ambient noise by 15 dB or more. If octave band analysis is used then the sound level should
exceed the masked threshold by at least 10 dB in one or more octave bands between 300 and 3000 Hz.
If 1/3 octave band analysis is used the sound level should exceed the masked threshold by at least 13 dB
in one or more octave bands between 300 and 3000 Hz.
Audibility Threshold - The sound pressure level for a specified frequency, at which persons with normal
hearing begin to respond.
Awakening Threshold - The level of sound that will awaken a sleeping subject 50% of the time.
A-weighted - A frequency weighting network which emphasizes the middle frequency components
similar to the response of the human ear. The A-weighted sound level is found to correlate well with the
subjective assessment of the disturbing effects of sounds.
Crest Factor - The ratio of the peak or maximum value to the root-mean-square (RMS) value.
Decibel Scale - A linear numbering scale used to define a logarithmic amplitude scale, thereby
compressing a wide range of amplitude values to a small set of numbers.
Decibel (dB) - One-tenth of a bel, the number of decibels denoting the ratio of the two amounts of power
being ten times the logarithm to the base 10 of this ratio.
Dispersion Angle - For EST speakers, this is defined as the angle for which sound is within 6 dBA of
the on-axis sound pressure level (SPL) at 1,000 Hz.
Equivalent Level (Leq) - The energy averaged sound pressure level over a specified time period.
Free Field - An environment in which there are no reflective surfaces within the region of interest.
Hertz (Hz) - The unit of frequency measurement representing cycles per second.
Leq - See Equivalent Level.
Masked Threshold - The level of sound at which a signal is just audible in ambient noise. For octave
analysis the masked threshold is the ambient level or 7.5 dB less than the masked threshold of the next
lower band, whichever is greater. For 1/3 octave analysis the masked threshold is the ambient level or
Speaker Application Guide
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Edwards Systems Technology
2.5 dB less than the masked threshold of the lower band, whichever is greater.
Masking - The process by which the threshold of audibility of one sound is raised by the presence of
another (masking) sound.
Pink Noise - Broadband noise whose energy content is inversely proportional to frequency (-3 dB per
octave or -10 dB per decade).
Resonance - Condition of peak vibratory response where a small change in excitation frequency causes
a decrease in system response.
Reverberation - The persistence of sound in an enclosure after a sound source has been stopped. Reverberation time is the time, in seconds, for sound pressure at a specific frequency to decay 60 dB after a
sound source is stopped.
Sabin - A measure of sound absorption of a surface. 1 Sabin is equivalent to 1 square meter of perfectly
absorptive surface.
Sound - Energy that is transmitted by pressure waves in air or other materials and is the objective cause
of the sensation of hearing. Commonly called noise if it is unwanted.
Sound Intensity - The rate of sound energy transmission per unit area in a specified direction.
Sound Level - A sound pressure level obtained using a signal to which a standard frequency-weighting
has been applied.
Sound Power - The rate at which acoustic energy is radiated from a source.
Sound Pressure - The pressure at a point caused by sound in space minus the static pressure at that
point.
Sound Pressure Level (SPL) - The fundamental measure of sound pressure.
Speech Intelligibility - The percentage of syllables, words, or sentences understood correctly. The value
obtained depends on the particular test applied.
Weighting Network - An electronic filter in a sound level meter which approximates, under defined
conditions, various desired frequency responses. The A-weighting network is most commonly used to
approximate the response of human hearing.
White Noise - A broadband noise having constant energy per unit of frequency.
Speaker Application Guide
Edwards Systems Technology
7 APPENDICES
7.1 Appendix A - EST Speakers: Specifications and Performance
Speaker Application Guide
Page 45
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Edwards Systems Technology
7.1.1 4" Cone Speakers - 964 & 965 Series
Catalog Number
Voltage
Operating Environment
Speaker
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
964-1A-4R
965A-4R1
25.2 VRMS
70.7 VRMS
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
4" (102mm) rated at 7 watts; 120 gram (4.29 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/4, 1/2, 1, 2 Watt Input
78 dBA (1/4W), 81 dBA (1/2W), 84 dBA (1W), 87 dBA (2W)
Symmetrical at 170 degrees
Speaker - screw terminals
Steel - 7.35" (187mm) Diameter, White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-4RF Backbox or North-American 4" Sq. 2-1/8" (54mm) deep
electrical box c/w 1-1/2" (38mm) extension ring
ULC S541, UL 1480
Note 1 - Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480 at 10 ft (3 m).
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
4" Cone Speaker
964/965 Series 4" Speaker (2 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
68.3
81.5
62.9
-75
73.9
82.6
63.2
-60
78.2
83.9
64.2
-45
81.7
85.2
65.2
-30
87.1
86.2
65.8
-15
90.8
87.2
65.9
0
91.4
87.7
66.5
15
90.8
87.2
65.9
30
87.1
86.2
65.8
45
81.7
85.2
65.2
60
78.2
83.9
64.2
75
73.9
82.6
63.2
90
68.3
81.5
62.9
Speaker Application Guide
Edwards Systems Technology
Page 47
7.1.2 4" Cone Speakers - 964 & 965 Series
Catalog Number
Voltage
Operating Environment
Speaker
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
964-1A-4S
965A-4S
25.2 VRMS
70.7 VRMS
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
4" (102mm) rated at 7 watts; 120 gram (4.29 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/4, 1/2, 1, 2 Watt Input
78 dBA (1/4W), 81 dBA (1/2W), 84 dBA (1W), 87 dBA (2W)
Symmetrical at 170 degrees
Speaker - screw terminals
Steel - 7" (178mm) Square, White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-4SF Backbox or North-American 4" Sq. 2-1/8" (54mm) deep
electrical box c/w 1-1/2" (38mm) extension ring
Surface - EST 960A-4SS Backbox
ULC S541, UL 1480
Note 1 - Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480 at 10 ft (3 m).
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
4" Cone Speaker
964/965 Series 4" Speaker (2 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
68.3
81.5
62.9
-75
73.9
82.6
63.2
-60
78.2
83.9
64.2
-45
81.7
85.2
65.2
-30
87.1
86.2
65.8
-15
90.8
87.2
65.9
0
91.4
87.7
66.5
15
90.8
87.2
65.9
30
87.1
86.2
65.8
45
81.7
85.2
65.2
60
78.2
83.9
64.2
75
73.9
82.6
63.2
90
68.3
81.5
62.9
Speaker Application Guide
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Edwards Systems Technology
7.1.3 4" Cone Speaker/Strobes - 964 & 965 Series (USA only)
Catalog Number
Speaker Input (V RMS)
UL 1971 Rated Strobe Output
- candela (cd)
UL 1638/ULC S526 Rated
Strobe Output
Strobe Average Operating
Current (note 2)
Strobe Peak Operating
Current (note 2)
Strobe Average Operating
Current (note 3)
Strobe Peak Operating
Current (note 3)
Strobe Flash Rate
Strobe Operating Voltage
Operating Environment
Lens Markings
Flash Tube Enclosure
Speaker
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
Note 1 Note 2 Note 3 Note 4 -
964-5A-4R 965-5A-4R
25
70
15 cd (wall)
15 cd (not UL 1638)
964-7A-4R 965-7A-4R
25
70
15 cd
(wall or ceiling)
75 cd
964-8A-4R 965-8A-4R
25
70
110 cd (wall)
60 cd (ceiling)
120 cd
70 mA @ 24 Vdc
80 mA @ 20 Vdc
208 mA @ 20 Vdc
105 mA @ 24 Vdc
125 mA @ 20 Vdc
208 mA @ 20 Vdc
219 mA @ 24 Vdc
272 mA @ 20 Vdc
352 mA @ 20 Vdc
84 mA @ 24 Vdc
99 mA @ 20 Vdc
360 mA @ 20 Vdc
168 mA @ 24 Vdc
204 mA @ 20 Vdc
594 mA @ 20 Vdc
325 mA @ 24 Vdc
355 mA @ 20 Vdc
876 mA @ 20 Vdc
1 flash per second
20 to 24V dc (Continuous)
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
Supplied with LKW-1 "FIRE" red letters, vertical both sides (Wall Mount)
Clear LEXAN
4" (102mm) rated at 7 watts; 120 gram (4.29 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/4, 1/2, 1, 2 Watt Input
75 dBA (1/4W), 78 dBA (1/2W), 81 dBA (1W), 84 dBA (2W) at 10 ft. (3m)
Symmetrical at 140 degrees
Speaker - screw terminals; Strobe 7" (175mm) color-coded polarized leads 2 INs/2 OUTs
Steel - 7.35" (187mm) Diameter White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-4RF Backbox or North-American 4" Sq. 2-1/8" (54mm) deep
electrical box c/w 1-1/2" (38mm) extension ring
UL 1971, UL 1480
(Complies with ADA Code of Federal Regulation Chapter 28 Part 36 Final Rule)
Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480.
From a FILTERED dc source.
From an UNFILTERED (Full Wave Rectified) dc source.
Use the average current rating to establish the maximum number of strobes, wire gauge and standby power
requirements.
Speaker Application Guide
Edwards Systems Technology
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
4" Speaker/Strobe
964/965 4" Speaker/Strobe (2 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
63.8
76.6
78.3
-80
67.2
77.5
78.7
-70
70.8
78.2
79.1
-60
72.7
79.2
79.6
-50
70.5
80.0
80.2
-40
66.0
81.0
80.5
-30
63.5
82.0
80.4
-20
70.0
83.0
81.2
-10
73.0
84.0
81.2
0
73.0
84.5
81.3
10
73.0
84.0
81.2
20
70.0
83.0
81.2
30
63.5
82.0
80.9
40
66.0
81.0
80.5
50
70.5
80.0
80.2
60
72.7
79.2
79.6
70
70.8
78.2
79.1
80
67.2
77.5
78.7
90
63.8
76.6
78.3
Speaker Application Guide
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Edwards Systems Technology
7.1.4 4" Cone Speaker/Strobes - 964 & 965 Series (USA only)
Catalog Number
Speaker Input (V RMS)
UL 1971 Rated Strobe Output
- candela (cd)
UL 1638/ULC S526 Rated
Strobe Output
Strobe Average Operating
Current (note 2)
Strobe Peak Operating
Current (note 2)
Strobe Average Operating
Current (note 3)
Strobe Peak Operating
Current (note 3)
Strobe Flash Rate
Strobe Operating Voltage
Operating Environment
Lens Markings
Flash Tube Enclosure
Speaker
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
Note 1 Note 2 Note 3 Note 4 -
964-5A-4S 965-5A-4S
25
70
15 cd (wall)
15 cd (not UL 1638)
964-7A-4S 965-7A-4S
25
70
15 cd
(wall or ceiling)
75 cd
964-8A-4S 965-8A-4S
25
70
110 cd (wall)
60 cd (ceiling)
120 cd
70 mA @ 24 Vdc
80 mA @ 20 Vdc
208 mA @ 20 Vdc
105 mA @ 24 Vdc
125 mA @ 20 Vdc
208 mA @ 20 Vdc
219 mA @ 24 Vdc
272 mA @ 20 Vdc
352 mA @ 20 Vdc
84 mA @ 24 Vdc
99 mA @ 20 Vdc
360 mA @ 20 Vdc
168 mA @ 24 Vdc
204 mA @ 20 Vdc
594 mA @ 20 Vdc
325 mA @ 24 Vdc
355 mA @ 20 Vdc
876 mA @ 20 Vdc
1 flash per second
20 to 24V dc (Continuous)
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
Supplied with LKW-1 "FIRE" red letters, vertical both sides (Wall Mount)
Clear LEXAN
4" (102mm) rated at 7 watts; 120 gram (4.29 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/4, 1/2, 1, 2 Watt Input
75 dBA (1/4W), 78 dBA (1/2W), 81 dBA (1W), 84 dBA (2W) at 10 ft. (3m)
Symmetrical at 140 degrees
Speaker - screw terminals; Strobe 7" (175mm) color-coded polarized leads 2 INs/2 OUTs
Steel - 7" (178mm) Square White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-4SF Backbox or North-American 4" Sq. 2-1/8" (54mm) deep
electrical box c/w 1-1/2" (38mm) extension ring
Surface - EST 960A-4SS Backbox
UL 1971, UL 1480
(Complies with ADA Code of Federal Regulation Chapter 28 Part 36 Final Rule)
Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480.
From a FILTERED dc source.
From an UNFILTERED (Full Wave Rectified) dc source.
Use the average current rating to establish the maximum number of strobes, wire gauge and standby power
requirements.
Speaker Application Guide
Edwards Systems Technology
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
4" Speaker/Strobe
964/965 4" Speaker/Strobe (2 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
63.8
76.6
78.3
-80
67.2
77.5
78.7
-70
70.8
78.2
79.1
-60
72.7
79.2
79.6
-50
70.5
80.0
80.2
-40
66.0
81.0
80.5
-30
63.5
82.0
80.4
-20
70.0
83.0
81.2
-10
73.0
84.0
81.2
0
73.0
84.5
81.3
10
73.0
84.0
81.2
20
70.0
83.0
81.2
30
63.5
82.0
80.9
40
66.0
81.0
80.5
50
70.5
80.0
80.2
60
72.7
79.2
79.6
70
70.8
78.2
79.1
80
67.2
77.5
78.7
90
63.8
76.6
78.3
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Edwards Systems Technology
7.1.5 4" Cone Speaker/Strobes - 765 & 767 Series (USA only)
Catalog Number
Speaker Input (V RMS)
UL 1971 Rated Strobe Output
- candela (cd)
UL 1638/ULC S526 Rated
Strobe Output
Strobe Average Operating
Current (note 2)
Strobe Peak Operating
Current (note 2)
Strobe Average Operating
Current (note 3)
Strobe Peak Operating
Current (note 3)
Strobe Flash Rate
Strobe Operating Voltage
Operating Environment
Lens Markings
Flash Tube Enclosure
Speaker
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Housing*
Mounting
Agency Listings
765-5A-*
767-5A-*
25
70
15 cd (wall)
15 cd (not UL 1638)
765-7A-*
767-7A-*
25
70
15 cd
(wall or ceiling)
75 cd
765-8A-*
767-8A-*
25
70
110 cd (wall)
60 cd (ceiling)
120 cd
70 mA @ 24 Vdc
80 mA @ 20 Vdc
208 mA @ 20 Vdc
105 mA @ 24 Vdc
125 mA @ 20 Vdc
208 mA @ 20 Vdc
219 mA @ 24 Vdc
272 mA @ 20 Vdc
352 mA @ 20 Vdc
84 mA @ 24 Vdc
99 mA @ 20 Vdc
360 mA @ 20 Vdc
168 mA @ 24 Vdc
204 mA @ 20 Vdc
594 mA @ 20 Vdc
325 mA @ 24 Vdc
355 mA @ 20 Vdc
876 mA @ 20 Vdc
1 flash per second
20 to 24V dc (Continuous)
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
Supplied with LKW-1 "FIRE" red letters, vertical both sides (Wall Mount)
Clear LEXAN
4" (102mm) rated at 7 watts; 120 gram (4.29 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/4, 1/2, 1, 2 Watt Input
72 dBA (1/4W), 75 dBA (1/2W), 78 dBA (1W), 81 dBA (2W) at 10 ft. (3m)
Symmetrical at 120 degrees
Speaker - screw terminals; Strobe 7" (175mm) color-coded polarized leads 2 INs/2 OUTs
Textured color impregnated Noryl - exceeds 94V-0 U.L. flammability rating
North-American 4" Sq. 2-1/8" (54mm) deep flush electrical box;
Surface - EST 897A-012 or 897A-112 Backbox
UL 1971, UL 1480
(Complies with ADA Code of Federal Regulation Chapter 28 Part 36 Final Rule)
* Suffix "-006" for Red housing, "-106" for Beige housing.
Note 1 - Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480.
Note 2 - From a FILTERED dc source.
Note 3 - From an UNFILTERED (Full Wave Rectified) dc source.
Note 4 - Use the average current rating to establish the maximum number of strobes, wire gauge and standby power
requirements.
Speaker Application Guide
Edwards Systems Technology
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
Speaker/Strobe
765/767 Series Speaker/Strobe (2 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
75.0
79.0
71.0
-75
79.0
79.0
73.0
-60
78.0
81.0
75.0
-45
75.0
84.0
76.0
-30
76.0
86.0
77.0
-15
77.0
87.0
78.0
0
82.0
87.0
78.0
15
77.0
87.0
78.0
30
76.0
86.0
77.0
45
75.0
84.0
76.0
60
78.0
81.0
75.0
75
79.0
79.0
73.0
90
75.0
79.0
71.0
Speaker Application Guide
Page 53
Page 54
Edwards Systems Technology
7.1.6 8" Cone Speakers - 964 & 965 Series
Catalog Number
Voltage
Operating Environment
Speaker Cone
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
964-1A-8R
965A-8R1
25.2 VRMS
70.7 VRMS
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
8" (203mm) rated at 5 watts; 152 gram (5.36 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/2, 1, 2, 4 Watt Input
81 dBA (1/2W), 84 dBA (1W), 87 dBA (2W), 90 dBA (4W) at 10 ft (3 m)
Symmetrical at 115 degrees
Speaker - screw terminals
Steel - 12-1/2" (318mm) Diameter, White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-8RF Backbox
ULC S541, UL 1480
Note 1 Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480 at 10 ft (3 m).
85 dBA @ 10 ft (3.05 m) on the 4W tap in an anechoic chamber using a 600-4,000 Hz sinusoidal source per
ULC S541.
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
8" Cone Speaker
964/965 Series 8" Speaker (4 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
70.5
82.6
78.2
-75
74.3
84.6
79.8
-60
76.4
86.9
81.6
-45
77.8
89.5
82.9
-30
86.7
91.9
84.1
-15
91.4
93.6
84.9
0
93.9
94.1
85.3
15
91.4
93.6
84.9
30
86.7
91.9
84.1
45
77.8
89.5
82.9
60
76.4
86.9
81.6
75
74.3
84.6
79.8
90
70.5
82.6
78.2
Speaker Application Guide
Edwards Systems Technology
Page 55
7.1.7 8" Cone Speakers - 964 & 965 Series
Catalog Number
Voltage
Operating Environment
Speaker Cone
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
964-1A-8S
965A-8S1
25.2 VRMS
70.7 VRMS
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
8" (203mm) rated at 5 watts; 152 gram (5.36 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/2, 1, 2, 4 Watt Input
81 dBA (1/2W), 84 dBA (1W), 87 dBA (2W), 90 dBA (4W) at 10 ft (3 m)
Symmetrical at 115 degrees
Speaker - screw terminals
Steel - 12-1/2" (318mm) Square, White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-8SF Backbox; Surface - EST 960A-8SS Backbox
ULC S541, UL 1480
Note 1 meets
Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480. The sound pressure level
85 dBA @ 10 ft (3.05 m) on the 4W tap in an anechoic chamber using a 600-4,000 Hz sinusoidal source per
ULC S541.
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
8" Cone Speaker
964/965 Series 8" Speaker (4 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
70.5
82.6
78.2
-75
74.3
84.6
79.8
-60
76.4
86.9
81.6
-45
77.8
89.5
82.9
-30
86.7
91.9
84.1
-15
91.4
93.6
84.9
0
93.9
94.1
85.3
15
91.4
93.6
84.9
30
86.7
91.9
84.1
45
77.8
89.5
82.9
60
76.4
86.9
81.6
75
74.3
84.6
79.8
90
70.5
82.6
78.2
Speaker Application Guide
Page 56
Edwards Systems Technology
7.1.8 8" Cone Speaker/Strobes - 964 & 965 Series
Catalog Number
Speaker Input (V RMS)
UL 1971 Rated Strobe Output
- candela (cd)
UL 1638/ULC S526 Rated
Strobe Output
Strobe Average Operating
Current (note 2)
Strobe Peak Operating
Current (note 2)
Strobe Average Operating
Current (note 3)
Strobe Peak Operating
Current (note 3)
Strobe Flash Rate
Strobe Operating Voltage
Operating Environment
Lens Markings
Flash Tube Enclosure
Speaker Cone
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
964-5A-8R 965-5A-8R
25
70
15 cd (wall)
15 cd (not UL 1638)
964-7A-8R 965-7A-8R
25
70
15 cd
(wall or ceiling)
75 cd
964-8A-8R 965-8A-8R
25
70
110 cd (wall)
60 cd (ceiling)
120 cd
70 mA @ 24 Vdc
80 mA @ 20 Vdc
208 mA @ 20 Vdc
105 mA @ 24 Vdc
125 mA @ 20 Vdc
208 mA @ 20 Vdc
219 mA @ 24 Vdc
272 mA @ 20 Vdc
352 mA @ 20 Vdc
84 mA @ 24 Vdc
99 mA @ 20 Vdc
360 mA @ 20 Vdc
168 mA @ 24 Vdc
204 mA @ 20 Vdc
594 mA @ 20 Vdc
325 mA @ 24 Vdc
355 mA @ 20 Vdc
876 mA @ 20 Vdc
1 flash per second
20 to 24V dc (Continuous)
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
Supplied with LKC-1 "FIRE" red letters, horizontal both sides (Ceiling Mount)
Clear LEXAN
8" (203mm) rated at 5 watts; 152 gram (5.36 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/2, 1, 2, 4 Watt Input
78 dBA (1/2W), 81 dBA (1W), 84 dBA (2W), 87 dBA (4W) at 10 ft. (3m)
Symmetrical at 84 degrees
Speaker - screw terminals; Strobe 7" (175mm) color-coded polarized leads 2 INs/2 OUTs
Steel - 12-1/2" (318mm) Diameter, White, Baked Epoxy Polyester
Powder-coat finish
Flush - EST 960A-8RF Backbox
ULC S541, ULC S526, UL 1971, UL 1480
(Complies with ADA Code of Federal Regulation Chapter 28 Part 36 Final Rule)
Note 1 - Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480. The sound pressure level meets
85 dBA @ 10 ft. (3.05 m) on the 4W tap in an anechoic chamber using a 600-4,000 Hz sinusoidal source per
ULC S541.
Note 2 - From a FILTERED dc source.
Note 3 - From an UNFILTERED (Full Wave Rectified) dc source.
Note 4 - Use the average current rating to establish the maximum number of strobes, wire gauge and standby power
requirements.
Speaker Application Guide
Edwards Systems Technology
Page 57
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
8" Speaker/Strobe
964/965 8" Speaker/Strobe (4 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
72.6
74.5
84.8
-80
77.1
75.3
85.2
-70
81.5
76.5
85.7
-60
84.9
78.8
86.3
-50
86.0
81.0
86.8
-40
86.2
83.7
87.3
-30
86.7
86.0
88.0
-20
89.2
87.8
88.3
-10
92.5
89.0
88.3
0
94.3
90.0
88.6
10
92.5
89.0
88.3
20
89.2
87.8
88.3
30
86.7
86.0
88.0
40
86.2
83.7
87.3
50
86.0
81.0
86.8
60
84.9
78.8
86.3
70
81.5
76.5
85.7
80
77.1
75.3
85.2
90
72.6
Speaker Application Guide
74.5
84.8
Page 58
Edwards Systems Technology
7.1.9 8" Cone Speaker/Strobes - 964 & 965 Series
Catalog Number
Speaker Input (V RMS)
UL 1971 Rated Strobe Output
- candela (cd)
UL 1638/ULC S526 Rated
Strobe Output
Strobe Average Operating
Current (note 2)
Strobe Peak Operating
Current (note 2)
Strobe Average Operating
Current (note 3)
Strobe Peak Operating
Current (note 3)
Strobe Flash Rate
Strobe Operating Voltage
Operating Environment
Lens Markings
Flash Tube Enclosure
Speaker Cone
Speaker Power Taps
Sound Output (note 1)
Sound Dispersion Angle
Wire Connections
Baffle & Finish
Mounting
Agency Listings
964-5A-8S 965-5A-8S
25
70
15 cd (wall)
15 cd (not UL 1638)
964-7A-8S 965-7A-8S
25
70
15 cd
(wall or ceiling)
75 cd
964-8A-8S 965-8A-8S
25
70
110 cd (wall)
60 cd (ceiling)
120 cd
70 mA @ 24 Vdc
80 mA @ 20 Vdc
208 mA @ 20 Vdc
105 mA @ 24 Vdc
125 mA @ 20 Vdc
208 mA @ 20 Vdc
219 mA @ 24 Vdc
272 mA @ 20 Vdc
352 mA @ 20 Vdc
84 mA @ 24 Vdc
99 mA @ 20 Vdc
360 mA @ 20 Vdc
168 mA @ 24 Vdc
204 mA @ 20 Vdc
594 mA @ 20 Vdc
325 mA @ 24 Vdc
355 mA @ 20 Vdc
876 mA @ 20 Vdc
1 flash per second
20 to 24V dc (Continuous)
INDOOR: 85% @ 30o C RH; 32-120o F (0-49o C) ambient temperature
Supplied with LKC-1 "FIRE" red letters, horizontal both sides (Ceiling Mount)
Clear LEXAN
8" (203mm) rated at 5 watts; 152 gram (5.36 oz) Ceramic Magnet; 8 Ohm
Voice Coil
1/2, 1, 2, 4 Watt Input
78 dBA (1/2W), 81 dBA (1W), 84 dBA (2W), 87 dBA (4W) at 10 ft. (3m)
Symmetrical at 84 degrees
Speaker - screw terminals; Strobe 7" (175mm) color-coded polarized leads 2 INs/2 OUTs
Steel - 12-1/2" (318mm) Square, White, Baked Epoxy Polyester Powder-coat finish
Flush - EST 960A-8SF Backbox; Surface - EST 960A-8SS Backbox
ULC S541, ULC S526, UL 1971, UL 1480
(Complies with ADA Code of Federal Regulation Chapter 28 Part 36 Final Rule)
Note 1 - Measured in a reverberation room using 400-4,000 Hz band pink noise per UL 1480. The sound pressure level meets
85 dBA @ 10 ft. (3.05 m) on the 4W tap in an anechoic chamber using a 600-4,000 Hz sinusoidal source per
ULC S541.
Note 2 - From a FILTERED dc source.
Note 3 - From an UNFILTERED (Full Wave Rectified) dc source.
Note 4 - Use the average current rating to establish the maximum number of strobes, wire gauge and standby power
requirements.
Speaker Application Guide
Edwards Systems Technology
Page 59
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
8" Speaker/Strobe
964/965 8" Speaker/Strobe (4 Watt)
SPL - Polar Data
Degrees 4000 Hz 1000 Hz 400 Hz
-90
72.6
74.5
84.8
-80
77.1
75.3
85.2
-70
81.5
76.5
85.7
-60
84.9
78.8
86.3
-50
86.0
81.0
86.8
-40
86.2
83.7
87.3
-30
86.7
86.0
88.0
-20
89.2
87.8
88.3
-10
92.5
89.0
88.3
0
94.3
90.0
88.6
10
92.5
89.0
88.3
20
89.2
87.8
88.3
30
86.7
86.0
88.0
40
86.2
83.7
87.3
50
86.0
81.0
86.8
60
84.9
78.8
86.3
70
81.5
76.5
85.7
80
77.1
75.3
85.2
90
72.6
Speaker Application Guide
74.5
84.8
Page 60
Edwards Systems Technology
7.1.10 Re-entrant Speakers - 894B Series (USA only)
Catalog Number
Housing Color
Power Taps
Voltage
Voice Coil Impedance
* Average Sound Pressure Level
Frequency
Sound Dispersion Angle
Ambient Operating Temperature
Wiring Connection
Baffle/Housing - Material
Agency Listings
894B-004
Red
894B-104
Beige
2, 4, 8, 15 Watt
70.7 VRMS
8 Ohm
92 dBA (2W); 94 dBA (4W); 97 dBA (8W); 99 dBA (15W)
400 to 5,000 Hz
Symmetrical at 150 degrees
-30o F to 150o F (-35o C to 66o C)
Terminals
Colored Lexan
UL 1480
* Sound level rating is determined at 1,000 Hz at a distance of 3.05 m (10 ft) in an anechoic chamber on an "A" weighted scale.
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
894B/CVT Re-entrant Speaker (15 Watt)
Degrees
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
SPL - Polar Data
4000 Hz 1000 Hz
95.8
92.2
97.2
92.5
98.0
93.2
100.2
94.0
102.2
95.2
102.2
96.3
101.5
97.3
101.5
98.0
103.2
98.4
104.5
98.6
103.2
98.4
101.5
98.0
101.5
97.3
102.2
96.3
102.2
95.2
100.2
94.0
98.0
93.2
97.2
92.5
95.8
92.2
400 Hz
75.8
76.9
77.6
78.3
79.0
80.0
80.3
81.3
81.8
82.2
81.8
81.3
80.3
80.0
79.0
78.3
77.6
76.9
75.8
Speaker Application Guide
Edwards Systems Technology
Page 61
7.1.11 4" Cone Speakers - CSVT Series (Canada only)
Catalog Number
Housing Color
Power Taps
Voltage
Frequency
Sound Dispersion Angle
Ambient Operating Temperature
Sensitivity as Microphone
Wiring Connection
Baffle/Housing - Material, Finish
Agency Listings
Distance
4' (1.2 m)
10' (3 m)
CSVT-27UCR
CSVT-77UCR
CSVTF-77UCR
1/2, 1, 2 Watt
1, 2, 4, 7-1/2 Watt
Surface or Semi-flush
Flush
70.7 VRMS
400 to 4000 Hz
Symmetrical at 150 degrees
-30 deg. F to 150 deg. F (-35 deg. C to 66 deg. C)
-29 dBM (Ref: 1 KHz., 10 dynes/sq.cm)
6" (150 mm) color-coded Wire Leads
Molded Noryl 190 Plastic with textured Red Finish
ULC S541
dBA Sound Pressure Levels - CSVT/CSVTF Series (note 1)
7-1/2 Watt
4 Watt
2 Watt
1 Watt
105
102
99
96
96
93
90
87
Note 1 - Measured in a reverberation room using 400-4000 Hz band pink noise per UL 1480.
CSVT
CVST 4" Speaker (7.5 Watt)
SPL - Polar Data
Degrees
1000 Hz
-90
86.0
-80
89.0
-70
92.0
-60
94.0
-50
95.0
-40
94.0
-30
95.0
-20
96.0
-10
96.0
0
96.0
10
96.0
20
96.0
30
95.0
40
94.0
50
95.0
60
94.0
70
92.0
80
89.0
90
86.0
Speaker Application Guide
CSVTF
1/2 Watt
93
84
Page 62
Edwards Systems Technology
7.1.12 Re-entrant Speakers - CVT/CVTF Series (Canada only)
Catalog Number
Wattage Taps
Power Taps
Voltage
Voice Coil Impedance
Frequency
Sound Dispersion Angle
Ambient Operating Temperature
Sensitivity as Microphone
Wiring Connection
Housing Material/Finish
Agency Listings
Distance
10' (3 m)
CVT-17UCR
CVT-157UCR
CVTF-157UCR
1/4, 1/2, 1 Watt
2, 4, 8, 15 Watt
Surface or Semi-flush
Flush
70.7 VRMS
8 Ohm
400 to 5,000 Hz
Symmetrical at 150 degrees
-30o F to 150o F (-35o C to 66o C)
-26 dBM (Ref: 1 KHz., 10 dynes/sq.cm)
Terminals
Die-cast Zinc Alloy with Red Baked Epoxy Finish
ULC S541
dBA Sound Pressure Level Table - CVT/CVTF Series (Note 1)
15 Watt
8 Watt
4 Watt
2 Watt
1 Watt
102
99
96
93
90
1/2 Watt
87
1/4 Watt
84
Note 1 - Measured in a reverberation room using 400-4000 Hz band pink noise per UL 1480.
Polar Data measured in an Anechoic Chamber at 10 ft (3.05 m).
CVT
CVTF
894B/CVT Re-entrant Speaker (15 Watt)
Degrees
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
SPL - Polar Data
4000 Hz 1000 Hz
95.8
92.2
97.2
92.5
98.0
93.2
100.2
94.0
102.2
95.2
102.2
96.3
101.5
97.3
101.5
98.0
103.2
98.4
104.5
98.6
103.2
98.4
101.5
98.0
101.5
97.3
102.2
96.3
102.2
95.2
100.2
94.0
98.0
93.2
97.2
92.5
95.8
92.2
400 Hz
75.8
76.9
77.6
78.3
79.0
80.0
80.3
81.3
81.8
82.2
81.8
81.3
80.3
80.0
79.0
78.3
77.6
76.9
75.8
Speaker Application Guide
Edwards Systems Technology
8 Acknowledgements
Section 3.1 - Based in part on ANSI/NFPA 72 1993 National Fire Alarm Code published
by the National Fire Protection Association.
Section 3.3 - Based in part on NATIONAL BUILDING CODE of CANADA (1995)
published by National Research Council Canada.
Section 3.4 - Based in part on CAN/ULC S524 M91 Standard for the Installation
of Fire Alarm Systems published by Underwriters’ Laboratories of Canada.
Speaker Application Guide
Page 63
Please contact your local Edwards Systems Technology Representative for
information on our complete line of fire alarm system products
or call us direct at one of the addresses below.
Head Offices
625 6th Street East
Owen Sound, Ontario
Canada N4K 5P8
TEL: (519) 376-2430
FAX: (519) 376-7258
6411 Parkland Drive
Sarasota, Florida
U.S.A. 34243
TEL: (813) 756-3278
FAX: (813) 751-6384
195 Farmington Avenue
Farmington, Connecticut
U.S.A. 06034
TEL: (203) 678-0410
FAX: (203) 677-1621
International Sales Office
6300 Northwest Drive
Mississauga, Ontario
Canada L4V 1J7
TEL: (905) 678-6767
FAX: (905) 678-9791
™
85000-0033 Issue 2
© 1995 EST
Printed in Canada