Alpine S2-W12D4

12″ subwoofer · dual 4 Ω · 600 W RMS

Fs 28.8 HzQts 0.44Vas 1.82 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 volume0.78 ft³ (22 L)
Qtc0.80
Fc53 Hz
F3 (−3 dB, no cabin gain)50 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 11 3/8″
Open sealed box in designer

Ported

Net volume2.51 ft³ (71 L)
Tuning (Fb)29 Hz
Portslot 2 3/16 × 14 5/16″, 34 3/4″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.8 Hz
Qts0.44
Qes0.47
Qms5.9
Vas1.82 ft³
Re (one coil)3.6 Ω
Sd73.2 in²
Xmax0.59″
Vd43.2 in³ calc.
Mms187 g calc.
BL16.1 T·m calc.
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø12 11/16″cutout Ø10 5/8″mounting depth 4 7/8″magnet Ø≈ 6 15/16″
Cutout diameter10 5/8″
Mounting depth4 7/8″
Overall diameter12 11/16″

“≈” 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 12″ models