Alpine SWS-15D4 (Type-S)

15″ subwoofer · dual 4 Ω · 500 W RMS

Fs 27 HzQts 0.44Vas 3.78 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 500 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume1.59 ft³ (45 L)
Qtc0.80
Fc50 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 14 1/8″
Open sealed box in designer

Ported

Net volume4.66 ft³ (132 L)
Tuning (Fb)28 Hz
Portslot 2 3/8 × 16 5/16″, 23 1/16″ long
Port velocity at 500 W62 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 11/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.44
Qes0.46
Qms8.57
Vas3.78 ft³
Re (one coil)3.5 Ω
Sd120.7 in²
Xmax0.59″
Vd71.3 in³ calc.
Mms279 g calc.
BL19 T·m calc.
EBP59 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.6 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø15 13/16″cutout Ø13 11/16″mounting depth 6 15/16″magnet Ø≈ 8 7/8″
Cutout diameter13 11/16″
Mounting depth6 15/16″
Overall diameter15 13/16″

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Alpine 15″ models