Alpine SWR-1522D (Type-R)

15″ subwoofer · dual 2 Ω · 750 W RMS

Fs 22 HzQts 0.41Vas 3.53 ft³Xmax 0.81″

Recommended box

For a sedan, one sub, 750 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 volume1.25 ft³ (35.5 L)
Qtc0.80
Fc43 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 11 11/16″
Open sealed box in designer

Ported

Net volume4.10 ft³ (116 L)
Tuning (Fb)25 Hz
Portslot 2 9/16 × 16 5/16″, 38 3/16″ long
Port velocity at 750 W63 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 20 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22 Hz
Qts0.41
Qes0.43
Qms8.57
Vas3.53 ft³
Re (one coil)1.6 Ω
Sd120.1 in²
Xmax0.81″
Vd97.9 in³ calc.
Mms445 g calc.
BL15.1 T·m calc.
EBP51 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.9 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power750 W

Mounting dimensions

Ø15 13/16″cutout Ø13 3/4″mounting depth 9 3/16″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth9 3/16″
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