15SW3A - Manual

15SW3A 4 W

The 1 SW3 is a high-power 1 -inch subwoofer, designed for use in car audio applications. It is specifically designed to reproduce the range of 3 to 150 Hz in a small vented box enclosure

The 15SW3A is capable of handling up to 1100 watts RMS (AES or 2200 watts continuous program power).

A bumped and undercut T-yoke assures a minimum of magnetic rectification

(off-centering) and a compatible maximum displacement (Xlim). The extended pole ensure a correct magnetic flux distribution and improve the thermal dissipation 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 15SW3A employ a 4” (100mm) diameter 4-layer aluminum round wire voice-coil. This is wound on a fiberglass-composite former, twice the thickness of typical formers, to drive the moving assembly with great rigidity.

The pressed-long-fiber-coated 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.

SPECIFICATIONS

Nominal diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380 (15) mm (in)

Nominal impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 W

Minimum impedance @ 88.6 Hz . . . . . . . . . . . . . . . . . . . . . 3.63

W

Power handling

Musical program . . . . . . . . . . . . . . . . . . . . . . . . . . . 2200 W

AES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1100 W

Sensitivity (2.0V@1m) averaged from 50 to 150 Hz . . . . . . . 92 dB SPL

Power compression @ 0 dB (nom. power) . . . . . . . . . . . . . . 2.0

dB

Power compression @ -3 dB (nom. power)/2. . . . . . . . . . . . 1.3

dB

Power compression @ -10 dB (nom. power)/10. . . . . . . . . . 0.9

dB

Frequency response @ -10 dB . . . . . . . . . . . . . . . . 38 to 1,500 Hz

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).

THIELE-SMALL PARAMETERS

Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Hz

3

Vas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76.3(2.68) l (ft )

Qts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.44

Qes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.45

Qms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.32

h o (half space) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.14%

2 2

Sd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0840 (130.20) m (in )

Vd (Sd x Xmax) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 651.0 (39.7) cm (in )

Xmax (max. excursion (peak) with 10% distortion) . . 7.75 (0.30) mm (in)

Xlim (max.excursion (peak) before physical damage)21.0 (0.83) mm (in)

Atmospheric conditions at TS parameter measurements:

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 (75.2) °C (°F)

Atmospheric pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,010 mb

Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 %

Thiele-Small parameters are measured after a 2-hour power test using half AES power .

A variation of ± 15% is allowed.

ADDITIONAL PARAMETERS b L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.8

Tm

Flux density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.58

T

Voice coil diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 (4) mm (in)

Voice coil winding length . . . . . . . . . . . . . . . . . . . . 46.5 (152.4) m (ft)

Wire temperature coefficient of resistance ( a25 ) . . . . . 0.00345

1/°C

Maximum voice coil operating temperature . . . . . . . . 295 (563) °C (°F) q vc (max.voice coil operating temp./max.power) . . 0.27 (0.52) °C/W(°F/W)

Hvc (voice coil winding depth) . . . . . . . . . . . . . . . . . 27.0 (1.06) mm (in)

Hag (air gap height). . . . . . . . . . . . . . . . . . . . . . . . . . 11.5 (0.45) mm (in)

Re . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.04

W

Mms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182,7 (0.41) g (lb)

Cms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80.0

m m/N

Rms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.90

kg/s

NON-LINEAR PARAMETERS

Le @ Fs (voice coil inductance @ Fs). . . . . . . . . . . . . . . . 5.112

mH

Le @ 1 kHz (voice coil inductance @ 1 kHz) . . . . . . . . . . 2.790

mH

Le @ 20 kHz (voice coil inductance @ 20 kHz) . . . . . . . . 1.529

mH

Red @ Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.32

W

Red @ 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.32

W

Red @ 20 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.61

W

Krm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7

W

Kxm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.7

mH

Erm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.94

Exm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.81

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 . . . . . . . . . . . . . . . . . . . 9,350 (20.61) g (lb)

Frame material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum

Frame finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black epoxy

Voice coil material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum

Voice coil former material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fiberglass

Cone material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressed long fiber pulp

3

Volume displaced by woofer . . . . . . . . . . . . . . . . . . . . 6.1 (0.215) l (ft )

Net weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,040 (24.33) g (lb)

Gross weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12,260 (28.95) g (lb)

Carton dimensions (W x D x H) . . . . . . 48 x 48 x 25 (18.9 x 18.9 x 9.9) 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)

Dimensions in mm.

RESPONSE CURVES (0° AND 45°) IN A TEST ENCLOSURE IN ANECHOIC

CHAMBER, 1 W / 1m

100

90

80

70

60

50

20 100 1k

Hz

Response Curve at 0°.

Response Curve at 45°.

Response curves measured in anechoic chamber with the subwoofer installed in a test enclosure, 1 W / 1 m.

IMPEDANCE AND PHASE CURVES, MEASURED IN FREE-AIR

400

300

90

45

15SW3A 4 W

SOFTWARE SIMULATED FREQUENCY RESPONSE CURVE dB 9

6

Ref Eff 0

-6

-12

-18

-24

-30

-36

5 10 50 100

Curva de Resposta em Closed box 90l.

Curva de Resposta em Closed Box 60l.

500 Hz

TYPE

15SW3A

SUGGESTED ENCLOUSURES

CLOSED BOX VENTED BOX

Internal Volume

(Liters)

XX

Internal Volume

(Liters)

90

60

Qty

3

3

Vent (s)

Diam. x Length (cm)

10 x 06

10 x 05

ENCLOUSURE INTERNAL VOLUME CALCULATION INSTRUCTIONS

TRAPEZOID RECTANGULAR RECTANGULAR

D

B

B

200 0

100

0

20 200 2k 20k

-90

Hz

Impedance Curve.

Phase Curve.

HARMONIC DISTORTION CURVES MEASURED AT 10% AES INPUT

POWER IN A TEST ENCLOSURE INSIDE AN ANECHOIC CHAMBER, 1 m

140

120

100

80

-45

A

A C

C

Internal Volume=

A x B x

( C + D

2

1000

(

Internal Volume=

A x B x C

1000

A, B C and D are internal dimension (in cm). The internal volume result is given in liters.

The suggested enclosure volumes are related to only one speaker, including woofer and duct(s) displaced volume.

For enclosure with more than one speaker, it is necessary to multiply the suggested volume and duct(s) by the quantity of speakers and build them with separated chambers (internal division).

Box volumes considering the bass lift inside the car with closed apertures.

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 the temperature inside the voice coil by measuring the voice coil DC resistance:

T

B

= T

A

+

æ

ç

è

R

B

R

A

1

ö

÷

ø

æ

ç

è

T

A

25 +

1 a

25

ö

÷

ø

60

20 200

Response Curve.

Distortion Curve, 2nd harmonic.

Distortion Curve, 3rd harmonic.

Hz

2k

TEST ENCLOSURE

100-liter volume with 3 ducts ø 6” by 7.87” length.

20k a

25

= 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 non- linear modeling parameters Krm,

Kxm, Erm and Exm from an empirical model, we can calculate voice coil impedance with good accuracy.

Devido aos avanços tecnológicos, reservamo-nos o direito de inserir modificações sem prévio aviso.

00 11 06 www.selenium.com.br

www.seleniumloudspeakers.com