PROFESSIONAL LINE - Compression Driver
D405
LOUDSPEAKERS
2” (50 mm) exit compression driver for high sensitivity,
low distortion and smooth medium frequency response
applications. That leads the D405 driver to deliver high
performance, high quality and high value for the pinnacle in
sound reinforcement applications.
Its construction features include:
®
- ferrofluid (Ferrosound ) loaded gap reducing heat
build-up and offering consistent results over long-term
demanding concert usage;
- voice coil is made of high temperature wire wound
®
on Kapton former to withstand high operating
temperatures;
- injected plastic housing;
- precisely engineered diaphragm structure and
alignment mechanism allows for easy, reliable and cost
effective repair in case of diaphragm failure.
DRIVER x HORN CONNECTION
HL47-50R
HL14-50
SPECIFICATIONS
Nominal impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ω
Minimum impedance @ 2,900 H z . . . . . . . . . . . . . . . . . . . . . 6.8 Ω
Power handling
Musical Program(w/ xover 500 Hz 12 d B / oct) 1 . . . . 150 W
Musical Program(w/ xover 1,000 Hz 12 dB / oct) 1. . . 200 W
Sensitivity
On horn,1W @ 1m, on axis2 . . . . . . . . . . . . . . . . . . . . 110 dB SPL
3
On plane-wave tube,1mW . . . . . . . . . . . . . . . . . . . . 116 dB SPL
Frequency response @ -10 dB . . . . . . . . . . . . . . . 300 to 7,000 Hz
Throat diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 (2) mm (in)
Diaphragm material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Phenolic
Voice coil diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 (4) mm (in)
Re . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 Ω
Flux density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.60 T
Minimum recommended crossover (12 dB / oct). . . . . . . . . 500 Hz
HM39-50R
HM47-50R
D405
HC56-50
1
Specifications to handle normal speech and music program material with 5% maximum
acceptable distortion on amplifier, with the recommended passive crossover connected.
Power is calculated taking into account the true RMS voltage at amplifier output along
with transducer nominal impedance.
Musical Program= 2 x W RMS.
2
Measured with HL47-50R horn, 500 - 3,500 Hz average.
3
The sensitivity represents the SPL in a 25 mm terminated tube, 500 - 3,500 Hz average.
HC79-50
ADDITIONAL INFORMATION
Magnet material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barium ferrite
Magnet weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,640 (92) g (oz)
Magnet diameter x depth . . . . . . . . . . . . 200 x 24 (7.87 x 0.95) mm (in)
Magnetic assembly weight . . . . . . . . . . . . . . . . . 7,740 (17.06) g (lb)
Housing material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plastic
Housing finish. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black
Magnetic assembly steel finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . Zinc-plated
Voice coil material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copper
®
Voice coil former material . . . . . . . . . . . . . . . . . . . . . . . . . Polyimide (Kapton )
Voice coil winding length. . . . . . . . . . . . . . . . . . . . . . . 7.0 (23.0) m (ft)
Voice coil winding depth . . . . . . . . . . . . . . . . . . . . . . . 4.1 (0.16) mm (in)
Wire temperature coefficient of resistance (α25) . . . . . 0.00329 1/°C
3
Volume displaced by driver. . . . . . . . . . . . . . . . . . . . 2.2 (0.078) l (ft )
Net weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,300 (18.30) g (lb)
Gross weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,520 (18.78) g (lb)
Carton dimensions (W x D x H) . . . . 23 x 22.5 x 9.7 (9.1 x 8.9 x 3.8)
M6 4 x holes
86
ø 102
cm (in)
MOUNTING INFORMATION
Horn connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt on
Number of holes . . . . . . . . . . . . . . . . . . 4 (M6) equally spaced threaded holes
Threaded holes diameter . . . . . . . . . . . . . . . . . . . . . . . . 102 (4) mm (in)
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Push terminals
Polarity . . . . . . . . . . . . . . . . . Positive voltage applied to the positive terminal
(red) gives diaphragm motion toward the throat
Page: 1/2 Ed.: 00 - 08/01
ø 205
ø 50
Dimensions in mm.
PROFESSIONAL LINE - Compression Driver
D405
LOUDSPEAKERS
RESPONSE AND IMPEDANCE CURVES W/ HL47-50R HORN INSIDE AN
ANECHOIC CHAMBER, 1 W / 1 m
120
25
110
20
100
15
HARMONIC DISTORTION CURVES W / HL47-50R HORN, 10 W / 1 m.
140
120
100
90
10
80
5
80
70
60
0
200
500
1k
2k
Hz
5k
10k
200
20k
500
1k
2k
Hz
5k
10k
20k
Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.
Response Curve.
Impedance Curve.
RESPONSE AND IMPEDANCE CURVES W / PLANE-WAVE TUBE, 1 m W
1W 1mW
150 120
25
140 110
20
POLAR RESPONSE CURVES
500 Hz
30°
15
120
10
1 kHz
330°
-10
60°
130 100
0
-6
300°
-20
dB
90°
240°
110
80
150°
70
0
200
500
1k
2k
Hz
5k
10k
Frequency response and impedance curves measured with 50 mm
terminated plane-wave tube, with sensitivity referenced to a 25 mm tube.
330°
30°
300°
300°
-20
dB
270°
240°
120°
210°
210°
0
-6
150°
180°
210°
330°
-10
60°
300°
-20
dB
270° 90°
240°
180°
330°
8 kHz
120°
150°
180°
0
-6
-10
60°
270° 90°
240°
150°
-20
dB
90°
30°
300°
120°
210°
-10
60°
20k
Response Curve.
Impedance Curve.
0
-6
2 kHz
330°
-20
dB
4 kHz
5
30°
100
180°
0
-6
-10
60°
270° 90°
120°
90
30°
D405 driver
coupled to a
HL47-50R horn.
270°
240°
120°
150°
180°
210°
Polar Response Curve, Horizontal.
Polar Response Curve, Vertical.
HARMONIC DISTORTION CURVES W/ HL47-50R HORN , 1 W / 1 m.
120
HOW TO CHOOSE THE RIGHT AMPLIFIER
The power amplifier must be able to supply twice the RMS driver power. This
3 dB headroom is necessary to handle the peaks that are common to
musical programs. When the amplifier clips those peaks, high distortion
arises and this may damage the transducer due to excessive heat. The use
of compressors is a good practice to reduce music dynamics to safe levels.
100
80
FINDING VOICE COIL TEMPERATURE
It is very important to avoid maximum voice coil temperature. Since moving
coil resistance (RE ) varies with temperature according to a well known law,
we can calculate the temperature inside the voice coil by measuring the
voice coil DC resistance:
60
R

1
TB = TA +  B − 1  TA − 25 +
α 25
 RA

40
200
500
1k
2k
Hz
Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.
®
Kapton : Du Pont trademark.
®
Ferrosound : Ferrofluidics Corporation trademark.
Specifications subject to
change without prior notice.
Page: 2/2 Ed.: 00 - 08/01
5k
10k
20k



T A , TB= voice coil temperatures in °C.
R A , RB= voice coil resistances at temperatures T A and TB, respectively.
α25= voice coil wire temperature coefficient at 25 °C.
EUROPE Address:
BRAZIL Address:
USA Address:
SELENIUM EUROPE
ELETRÔNICA SELENIUM S.A.
SELENIUM LOUDSPEAKER USA
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St. Elisabethenstrasse 6
1701 South Park Court, Bldg 102
65396 Walluf / Ober-Walluf - Germany
Chesapeake, VA 23320 - USA
Nova Santa Rita - RS - Brazil
Phone: +(49) 6123 601570
Phone: (757) 424-7516 / (800) 562-0510
Fax: +(55) 51 479-1120
Fax: +(49) 6123 601587
URL: www.selenium.com.br
Fax: (757) 424-5246
E-mail: sales@selenium-eu.com
E-mail: export@selenium-usa.com
URL: www.seleniumloudspeakers.com URL: www.seleniumloudspeakers.com