Alpine SWT-10S4 (Type-R thin)

10″ subwoofer · 4 Ω · 350 W RMS

Fs 30 HzQts 0.46Vas 1.35 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 350 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 volume0.67 ft³ (19 L)
Qtc0.80
Fc52 Hz
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 12 5/16″
Open sealed box in designer

Ported

Net volume1.98 ft³ (56 L)
Tuning (Fb)29 Hz
Portslot 1 9/16 × 14 5/16″, 32 3/8″ long
Port velocity at 350 W56 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.46
Qes0.54
Qms3.22
Vas1.35 ft³
Re3.7 Ω
Sd51.2 in²
Xmax0.43″
Vd22.2 in³ calc.
Mms113 g calc.
BL12.1 T·m calc.
EBP56 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.8 dB calc.

General

Size10″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

Ø10 11/16″cutout Ø8 15/16″mounting depth 4 3/16″magnet Ø≈ 5 13/16″
Cutout diameter8 15/16″
Mounting depth4 3/16″
Overall diameter10 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 10″ models