Alpine SWR-T12 (Type-R thin)

12″ subwoofer · 4 Ω · 600 W RMS

Fs 32 HzQts 0.68Vas 1.17 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 volume1.73 ft³ (49 L)
Qtc0.88
Fc41 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)28 Hz
Portslot 2 3/8 × 14 5/16″, 34 9/16″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs32 Hz
Qts0.68
Qes0.75
Qms7.15
Vas1.17 ft³
Re3.85 Ω
Sd76 in²
Xmax0.59″
Vd44.9 in³ calc.
Mms255 g calc.
BL16.2 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m83.6 dB calc.

General

Size12″
Voice coils4 Ω
RMS power600 W

Mounting dimensions

Ø12 5/8″cutout Ø10 13/16″mounting depth 3 1/2″magnet Ø≈ 7 1/16″
Cutout diameter10 13/16″
Mounting depth3 1/2″
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