Alpine S-W12D4

12″ subwoofer · dual 4 Ω · 600 W RMS

Fs 31 HzQts 0.52Vas 1.64 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 600 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 volume1.17 ft³ (33 L)
Qtc0.80
Fc48 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 15 13/16″
Open sealed box in designer

Ported

Net volume2.83 ft³ (80 L)
Tuning (Fb)29 Hz
Portslot 2 3/8 × 14 5/16″, 33 1/4″ long
Port velocity at 600 W60 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.52
Qes0.58
Qms4.68
Vas1.64 ft³
Re (one coil)3.8 Ω
Sd73.2 in²
Xmax0.59″
Vd43.2 in³ calc.
Mms179 g calc.
BL15.1 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.8 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø12 5/8″cutout Ø10 9/16″mounting depth 5 1/16″magnet Ø≈ 6 7/8″
Cutout diameter10 9/16″
Mounting depth5 1/16″
Overall diameter12 5/8″

“≈” 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 12″ models