SM31-EZ(-T) Surface-Mount Speaker
Technical Information for System Engineers
Key Features
Specifications: SM31-EZ(-T)
System Type
Impedance (nominal) 1
Sensitivity dB @ 2.83 V/1 m
Sensitivity dB @ 1 W/1 m 2
Frequency Response (- 3 dB) 3
Frequency Response (-10 dB) 3
Max. Program Power 4
Max. Continuous Power RMS 5
Max. Power SPL @ 1 m 6
Coverage Angle (-6 dB @ 2 kHz)
Coverage Angle (-6 dB @ 10 kHz)
Coverage Angle (averaged from 2 to
10 kHz)
Angle of Pointability
Directivity Factor (Q)
Directivity Index (DI) dB
Tap Selector
Transducer - Full-Range Driver
Low Frequency Voice Coil
Enclosure Material
Grille
Inputs
Colors
Height
Width
Depth (including mounting bracket)
Weight
Shipping Weight
Packaging
Included Accessories
Optional Accessories
Regulatory - UL
Regulatory - CE
RoHS
1
2
3
4
5
6
Impedance listed per IEC 60268-5 with a minimum less than 80% the nominal impedance
1 W 1 m sensitivity determined using nominal
impedance
Frequency response measured in half or
full space as dictated by speaker mounting
configuration
Max program power is 3 dB above max
continuous power
3 inch full-range, surface-mount, 8 ohm with optional 10-watt
transformer for 25/70.7/100-volt applications
8 ohm
85.0 dB
85.0 dB
170 Hz - 14 kHz
120 Hz - 22 kHz
40 W
20 W
98.0 dB
70°
45°
80°
0 to 90° vertical 0 to 359° axial (full hemisphere)
4.9 (averaged 100Hz - 10kHz), 7.1 (2kHz)
5.1 (averaged 100Hz - 10kHz), 8.5 (2kHz)
Five--position tap switch (transformer accessory only)
76.1 mm (3.0 in.) Polypropylene driver with butyl rubber
surround
19.0 mm (0.75 in.)
ABS
Corrosion-resistant, powder-coated aluminum
Screw terminal
Black or white
110.4 mm (4.35 in.)
110.4 mm (4.35 in.)
96.9 mm (3.81 in.)
0.6 kg (1.4 lbs.)
0.9 kg (2.0 lbs.)
One per box
N/A
10-watt transformer (AC-SM31-XFMR), Single gang junction
box mounting plate (AC-SM31-MP)
UL 1480 (UEAY) approved (SM31-EZ and transformer)
Approved
Approved
Transformer Taps
70.7 V
Output
100 V
Output
10 W
95.0 dB
10 W
95.0 dB
1.3 W
86.0 dB
5W
92.0 dB
5W
92.0 dB
0.7 W
83.5 dB
2.5 W
89.0 dB
2.5 W
89.0 dB
0.4 W
81.0 dB
1.3 W
86.0 dB
1.3 W
86.0 dB
0.2 W
78.0 dB
0.7 W
83.5 dB
0.1 W
75.0 dB
Continuous power rating, EIA-426-B test
Max output based on max continuous power
© 2012 SoundTube Entertainment. All rights reserved. SM31-EZ REV 02.14.12
25 V
Output
• Two models are available, the SM31-EZ
and the SM31-EZ-T. The latter includes a
10-watt transformer.
• One 3 inch (76.1 mm) polypropylene
driver with butyl rubber surround
• Weatherized components for indoor/outdoor applications.
• Theft- and corrosion-resistant mounting
mechanism with an indexed swivel-joint
for precision aiming in any direction.
• Ultra-low profile ZeroReflection™ ABS
enclosure (4 inch diameter by 3.5 inch
deep, including mounting plate).
• Five position selectable tap switch (SM31EZ-T only)
• Corrosion-resistant, powder-coated aluminum grille.
• UL 1480 (UEAY) approved.
• High quality black or white paint finish.
• Optional accessories: the SM31-EZ-T
includes a 10-watt transformer (AC31-XFMR) that incorporates a 5 position
tap switch and a wall plate for installation in a single-gang deep junction box.
This transformer kit is also available as an
optional accessory.
Description
The SM31-EZ(-T) is a premium full-range
3 inch surface-mount speaker, with overall
dimensions smaller than a 4 inch sphere.
The SM31-EZ(-T) incorporates a proprietary
attachment with indexed swivel-joint for
complete hemispherical aiming. Components
have been weatherized for indoor/outdoor
applications.
The SM31-EZ is an 8 ohm speaker without
transformer. The SM31-EZ-T is shipped with
the AC-SM31-XFMR transformer module to
add a 20W transformer and 5 position tap
switch that mounts into a single-gang deep
junction box.
Applications
Engineered for rapid installation and low
profile mounting for smaller venues, the
SM31-EZ(-T) is ideal for retail, restaurants,
conference rooms, patio areas, educational
facilities or any setting where full-range
intelligibility, unobtrusive design and installation ease are paramount. For additional
bass response down to 41 Hz (- 10 dB), the
SM1001p powered 10-inch subwoofer may be
incorporated.
SM31-EZ(-T) Surface-Mount Speaker
Technical Information for System Engineers
Patented SoundTube
Technologies
SoundTube Entertainment and the
MSE Audio Group constantly develop
new technologies which enhance audio
product performance. SoundTube Entertainment innovations are protected by
multiple U.S. and international patents,
which explicitly cover SoundTube dome,
enclosure and dispersion technologies.
The MSE Audio Group actively defends
its patents in order to protect SoundTube
resellers and end-users.
Technical Data and
Specification Tools
Technical Data
SoundTube Entertainment strives to
provide complete and effective technical
information and data to dealers, engineers and designers. All data are available from SoundTube Entertainment or at
www.soundtube.com.
Technical data and downloads include:
EASE™ data – 3-D polar plots.
EASE™ Address – 2-D modeling for distributed systems
Autodesk® Revit® software
Tech Sheets – Technical information and
architectural specs for system engineers
SoundTubeSPEC™ – Proprietary speaker
placement software
Acquisition and Verification
All data for SoundTube speakers are
independently collected from and verified by NWAA Labs (www.nwaalabs.
com) using their proprietary MACH
testing system. All data are collected and
analyzed according to ASTM, ISO and
AES standards using EASERA, TEF and
MLSSA. Full balloon data including both
phase and magnitude is compiled into
a variety of formats including EASE 4.x,
GLL and CLF.
Architectural Specifications
The loudspeaker transducer shall
consist of one full-range 76.2 mm (3.0 in.)
polypropylene cone with butyl rubber surround. The low-frequency voice coil diam-
eter shall be 19.0 mm (0.75 in.).
Performance specifications for a typical production unit shall be as follows:
Useable frequency response shall extend
from 120 Hz – 22 kHz (- 10 dB). Measured
sensitivity (2.83 volt input, 1 meter) shall
be at least 85.0 dB. The speaker shall have
a nominal impedance of 8 ohms, with an
optional 10-watt transformer (AC-SM31XFMR) for distributed systems. The
optional transformer shall have a five-position tap switch for 25-, 70.7- and 100-volt
applications. Rated power capacity shall
be at least 20 watts continuous (RMS) and
conform to EIA-426-B. Maximum continuous power output at 1 meter shall be 98.0
dB.
Surface-mount installation for the unit
is designed to mount to wall, ceiling or
other rigid structure. When the optional
20-watt transformer is incorporated,
mounting shall be to a single-gang deep
junction box. Vertical and horizontal pivoting shall be employed to offer unlimited
aiming capability for indoor and outdoor
applications. Installation for the speaker
shall be by proprietary and corrosion-resistant ball mount with an indexed swiveljoint for precision aiming.
External wiring shall be by low-profile
screw terminal and shall accept from 10
– 22-gauge wire. The system shall be for
indoor/outdoor applications.
The enclosure shall be constructed of
injection-molded, ABS. The grille shall be
constructed of powder-coated aluminum
for lasting performance and affix to the
speaker baffle via pressure fit. Overall
cabinet dimensions shall be no more than
110.4 mm (4.35 in.) in height by 110.4 mm
(4.35 in.) in width by 96.9 mm (3.81 in.) in
depth including the mounting bracket.
The system shall be the SM31-EZ for
low-impedance applications or the SM31EZ-T for high-impedance applications.
SoundTube Entertainment
6430 North Business Park Loop
Park City, Utah 84098
Phone
435.647.9555
Fax
435.647.9666
Toll Free 800.647.TUBE
www.soundtube.com
All SoundTube products come
with a 5-year limited warranty.
SM31-EZ(-T) Surface-Mount Speaker
Technical Information for System Engineers
Graphs and Plots
Phase/Impedance Response
Frequency Response
110
Frequency Response
64
100
Impedance/Phase
180
Impedance
Phase
56
135
90
60
Ohms
dBSPL
70
50
40
30
20
48
90
40
45
32
0
24
-45
16
-90
8
-135
0
-180
Phase(Degrees)
80
20000
10000
5000
2000
1000
500
Directivity Index (DI)
Vertical Beamwidth (- 6dB)
20
150
15
120
10
dB
90
60
Directivity Index (DI)
5
0
-3dB
-6dB
-9dB
30
-5
0
20000
5000
2000
10000
Hertz
1000
500
200
100
50
20
20000
5000
2000
10000
Hertz
1000
500
200
100
50
-10
20
Degrees
200
Hertz
Vertical Beamwidth (-6 dB)
180
100
20
20000
Hertz
10000
5000
2000
1000
500
200
100
50
20
0
50
10
SM31-EZ(-T) Surface-Mount Speaker
Technical Information for System Engineers
Horizontal
Vertical
Polar Plots
125Hz 1/3 Oct
125 Hz
250 Hz
Horiz Polar
Vert Polar
0
0
330
30
Horiz Polar
Vert Polar
330
-6
-12
60
-18
300
240
270
210
120
210
150
2KHz 1/3 Oct
330
300
4,000 Hz
Horiz Polar
Vert Polar
0
0
330
30
300
60
-30
270
90
240
120
8,000 Hz
30
330
120
210
150
150
180
8KHz 1/3 Oct
10,000 Hz
Horiz Polar
Vert Polar
0
0
330
30
10KHz 1/3 Oct
Horiz Polar
Vert Polar
0
0
-6
-6
-6
-12
-12
-12
-12
300
60
300
90
-36
240
120
150
90
120
240
210
180
150
180
60
-18
-30
-36
270
30
-24
-30
-36
270
300
60
-18
-24
-30
-30
210
60
-18
-24
-24
90
-36
180
Horiz Polar
Vert Polar
60
-24
210
4KHz 1/3 Oct
30
-18
-6
-18
270
150
0
0
-12
240
180
180
0
0
-12
-36
270
Horiz Polar
Vert Polar
-6
-30
90
-36
240
120
330
30
-24
-30
90
-36
0
0
1KHz 1/3 Oct
-6
-18
-24
-30
2,000 Hz
300
60
-18
-24
270
330
30
1,000 Hz
Horiz Polar
Vert Polar
-6
-12
300
0
0
500Hz 1/3 Oct
500 Hz
250Hz 1/3 Oct
210
90
120
240
120
240
-36
270
90
210
150
150
180
180
Technical data, EASE™ plots, SoundTubeSPEC™ software and product downloads available at www.soundtube.com
Mechanical Drawings
SM31-EZ
SM31-EZ-T
130.5 mm
(5.14 in.)
92.3 mm
(3.63 in.)
132.3 mm
(5.21 in.)
81.3 mm
(3.20 in.)
96.9 mm
(3.81 in.)
110.4 mm
(4.35 in.)
125.0 mm
(4.92 in.)
SoundTube Entertainment manufactures a complete line of speakers for:
Open-Ceiling • In-Ceiling • Surface-Mount • Outdoor • Sound-Focusing
All SoundTube products are designed and engineered in the USA.