Alpine R2-W12D2

12″ subwoofer · dual 2 Ω · 750 W RMS

Fs 29 HzQts 0.41Vas 1.30 ft³Xmax 0.79″

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 volume0.67 ft³ (19 L)
Qtc0.71
Fc50 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.52 ft³ (43 L)
Tuning (Fb)30 Hz
Portslot 1 3/4 × 14 5/16″, 45 1/2″ long
Port velocity at 750 W67 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.41
Qes0.44
Qms6.32
Vas1.30 ft³
Re (one coil)1.9 Ω
Sd74.2 in²
Xmax0.79″
Vd58.5 in³ calc.
Mms265 g calc.
BL14.4 T·m calc.
EBP66 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power750 W

Mounting dimensions

Ø12 5/8″cutout Ø10 7/8″mounting depth 6 7/16″magnet Ø≈ 7 1/16″
Cutout diameter10 7/8″
Mounting depth6 7/16″
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