SPECIFICATIONS Nominal diameter . . . . . . . . .... mm (in)

SPECIFICATIONS Nominal diameter . . . . . . . . .... mm (in)
SUBWOOFER
15SW2P / 15SW2P-SLF*
The 15 SW2P / 15 SW2P-SLF is a high-power 15 -inch subwoofer, designed for
use in professional applications. It is specifically designed to reproduce the range of 40
to 200 Hz in a 2.4 to 4.2 cubic foot (70-120 liter) vented box.
The 15SW2P / 15SW2P-SLF is capable of handling up to 600 watts RMS (AES
or 1,200 watts continuous program power).
A bumped and undercut T-yoke assures a minimum of magnetic rectification
(off-centering) and a compatible maximum displacement (Xmax). The magnet circuit
was optimized by finite element software. Special attention was given to the driver's
behavior under mechanical overload conditions, meaning that all but the most severe
abuse will be tolerated - without failure.
The 15SW2P / 15SW2P-SLF employs a 4” (100mm) diameter 4-layer copper
voice-coil using over 80 grams of copper. This is wound on a fiberglass-composite
former, twice the thickness of typical formers, to drive the moving assembly with great
rigidity.
The non-pressed-long-fiber-pulp cone has the necessary mass and stiffness to
withstand the tremendous accelerating forces required, and is precisely centered by
two counter-balancing, distortion canceling, polyester-cotton-fiber spiders.
A reinforced aluminum frame is highly effective in withstanding mechanical
shocks and vibration. It also acts as a heat-sink for the motor, without removing energy
from the loudspeakers intended magnetic gap. The aluminum frame includes six vents
that allow air exchange between the spider and the top-plate. This helps to reduce topplate temperature, in turn cooling the voice-coil. The magnetic-circuit also employs a
multi-cooling system (patent pending) consisting of a large diameter center hole,
surrounded by six smaller holes that forces cool air across the voice-coil. These features
insure an extremely efficient heat transfer from voice-coil to surroundings, resulting in
very high thermal power handling.
*15SW2P-SLF: Product without Selenium logo printed on the dust cap.
mm (in)
W
W
W
W
dB SPL
dB
dB
dB
Hz
THIELE-SMALL PARAMETERS
Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Vas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 (2.68)
Qts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.34
Qes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.35
Qms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.50
ho (half space) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3
Sd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0814 (126.17)
Vd (Sd x Xmax). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550 (33.56)
Xmax (max. excursion (peak) with 10% distortion) . . . 6.5 (0.26)
Xlim (max.excursion (peak) before physical damage)24.5 (0.96)
%
m2 (in2)
cm3 (in3)
mm (in)
mm (in)
Atmospheric conditions at TS parameter measurements:
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 (73.4)
Atmospheric pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,012
Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
°C (°F)
mb
%
Hz
l (ft3)
Thiele-Small parameters are measured after a 2-hour power test using half AES power .
A variation of ± 15% is allowed.
ADDITIONAL PARAMETERS
bL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.4
Flux density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.83
Voice coil diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 (4)
Voice coil winding length . . . . . . . . . . . . . . . . . . . . 50.5 (165.7)
Wire temperature coefficient of resistance (a25) . . . . . 0.00380
Maximum voice coil operating temperature. . . . . . . . 250 (482)
qvc (max.voice coil operating temp./max.power) . . 0.42 (0.81)
Hvc (voice coil winding depth) . . . . . . . . . . . . . . . . . 22.5 (0.88)
Hag (air gap height). . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 (0.35)
Re . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8
Mms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 (0.423)
Cms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Rms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.97
NON-LINEAR PARAMETERS
Le @ Fs (voice coil inductance @ Fs). . . . . . . . . . . . . . . . . . 8.9
Le @ 1 kHz (voice coil inductance @ 1 kHz) . . . . . . . . . . . . 4.3
Le @ 20 kHz (voice coil inductance @ 20 kHz) . . . . . . . . . . 2.2
Red @ Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.46
Red @ 1 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.03
Red @ 20 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173.01
Krm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.439
Kxm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.917
Erm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.952
Tm
T
mm (in)
m (ft)
1/°C
°C (°F)
°C/W(°F/W)
mm (in)
mm (in)
W
g (lb)
mm/N
kg/s
mH
mH
mH
W
W
W
W
mH
ADDITIONAL INFORMATION
Magnet material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barium ferrite
Magnet weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,440 (120) g (oz)
Magnet diameter x depth . . . . . . . . . . . . . . 220 x 24 (8.66 x 0.95) mm (in)
Magnetic assembly weight . . . . . . . . . . . . . . . . . . . 8,600 (18.96) g (lb)
Frame material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum
Frame finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black epoxy
Voice coil material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copper
Voice coil former material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fiberglass
Cone material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Non pressed long fiber pulp
Volume displaced by woofer . . . . . . . . . . . . . . . . . . . . 7.2 (0.254) l (ft3)
Net weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,400 (22.92) g (lb)
Gross weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,600 (25.57) g (lb)
Carton dimensions (W x D x H) . . . . . . 43 x 43 x 23 (16.9 x 16.9 x 9.0)
cm (in)
MOUNTING INFORMATION
Number of bolt-holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Bolt-hole diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 (0.27) mm (in)
Bolt-circle diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . 368 (14.48) mm (in)
Baffle cutout diameter (front mount) . . . . . . . . . . . . . 351 (13.81) mm (in)
Baffle cutout diameter (rear mount) . . . . . . . . . . . . . . 345 (13.58) mm (in)
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver-plated push terminals
Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . Positive voltage applied to the positive
terminal (red) gives forward cone motion
Minimum clearance between the back of the magnetic assembly and the
enclosure wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 (3) mm (in)
ø 388
190
8x ø 7
ø 368
ø 220
1
Power handling specifications refer to normal speech and/or music program material,
reproduced by an amplifier producing no more than 5% distortion. Power is calculated as
true RMS voltage squared divided by the nominal impedance of the loudspeaker.
2
AES Standard (60 - 600 Hz).
ø 349
SPECIFICATIONS
Nominal diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380 (15)
Nominal impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Minimum impedance @ 90 Hz. . . . . . . . . . . . . . . . . . . . . . . . 7.4
Power handling
Musical program1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,200
AES2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600
Sensitivity (2.83V@1m) averaged from 55 to 100 Hz . . . . . . 93
Power compression @ 0 dB (nom. power) . . . . . . . . . . . . . . 3,1
Power compression @ -3 dB (nom. power)/2. . . . . . . . . . . . 2,4
Power compression @ -10 dB (nom. power)/10. . . . . . . . . . 0,1
Frequency response @ -10 dB . . . . . . . . . . . . . . . . 40 to 1,200
60
118
12
Dimensions in mm.
SUBWOOFER
15SW2P / 15SW2P-SLF*
RESPONSE CURVES (0° AND 45°) IN A TEST ENCLOSURE ON GROUND
PLANE AND OUTDOOR ENVIRONMENT, 1 W / 1m
POLAR RESPONSE CURVES
50 Hz
100
30°
100 Hz
330°
-10
60°
90
0
-6
30°
-20
dB
90°
250 Hz
330°
-10
60°
300°
0
-6
270° 90°
330°
-10
60°
300°
-20
dB
0
-6
30°
300°
-20
dB
270° 90°
270°
80
240°
dB
120°
150°
70
180°
240°
120°
210°
150°
330°
30°
500 Hz
30°
60
20
100
Response Curve at 0°.
Response Curve at 45°.
B
K
240°
150°
Response curves measured on ground plane and outdoor environment with
the subwoofer installed in a test enclosure, 1 W / 1 m. This curves was
decreased 6 dB to compensate the ground plane gain.
180°
330°
30°
150°
180°
330°
300°
-20
dB
270° 90°
240°
0
-6
-10
60°
300°
120°
210°
180°
210°
1,25 kHz
-20
dB
270° 90°
120°
0
-6
-10
60°
300°
-20
dB
90°
1k
Hz
150°
800 Hz
-10
60°
50
0
-6
180°
240°
120°
210°
270°
240°
120°
210°
150°
180°
210°
Polar Response Curve.
IMPEDANCE AND PHASE CURVES, MEASURED IN FREE-AIR
400
90
300
degrees
ohms
45
200
0
100
-45
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.
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:
æR
öæ
1
TB = TA + çç B - 1÷÷ çç TA - 25 +
a 25
è RA
øè
0
-90
20
200
Hz
2k
Impedance Curve.
Phase Curve.
20k
B
K
HARMONIC DISTORTION CURVES MEASURED AT 10% AES INPUT
POWER IN A TEST ENCLOSURE INSIDE AN ANECHOIC CHAMBER, 1 m
140
ö
÷÷
ø
TA , TB= voice coil temperatures in °C.
RA , RB= voice coil resistances at temperatures TA and TB, respectively.
a25= voice coil wire temperature coefficient at 25 °C.
POWER COMPRESSION
Voice coil resistance rises with temperature, which leads to efficiency
reduction. Therefore, if after doubling the applied electric power to the driver
we get a 2 dB rise in SPL instead of the expected 3 dB, we can say that
power compression equals 1 dB. An efficient cooling system to dissipate
voice coil heat is very important to reduce power compression.
NON-LINEAR VOICE COIL PARAMETERS
Due to its close coupling with the magnetic assembly, the voice coil in
electrodynamic loudspeakers is a very non-linear circuit. Using the nonlinear modeling parameters Krm, Kxm, Erm and Exm from an empirical
model, we can calculate voice coil impedance with good accuracy.
dB
120
100
SUGGESTED PROJECTS
HB 1505 D1
HB 1502 B1
PAS 3G2
HB 1505 C1
80
For additional project suggestions, please access our website.
60
20
200
20k
Hz
Response Curve.
Distortion Curve, 2nd harmonic.
Distortion Curve, 3rd harmonic.
B
K
TEST ENCLOSURE
100-liter volume with 3 ducts ø 4” by 4.72” length.
Specifications subject to change
without prior notice.
Cod.: 151532
Rev.: 01 - 01 / 05
ELETRÔNICA SELENIUM S.A.
BR 386 Km 435 - Nova Santa Rita/RS - Brasil CEP 92480-000
Tel.: 51. 479 4000 Fax: 51. 479 1150
www.selenium.com.br
Atendimento Técnico: 0800 514161
FILIAL SÃO PAULO
Rua Aquinos, 157 - São Paulo/SP - Brasil - CEP 05036-070
PABX.: 11.2126 6300 Fax: 11.2126 6360
SELENIUM USA / SELENIUM EUROPE
www.seleniumloudspeakers.com
Toll Free: 1800 5620510
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