Audio System R 12

12″ subwoofer · 4 Ω · 400 W RMS

Fs 27.7 HzQts 0.35Vas 2.98 ft³Xmax 0.33″

Recommended box

For a sedan, one sub, 400 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 volume0.74 ft³ (21 L)
Qtc0.79
Fc62 Hz
F3 (−3 dB, no cabin gain)60 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 7/8″
Open sealed box in designer

Ported

Net volume2.22 ft³ (63 L)
Tuning (Fb)33 Hz
Portslot 1 3/4 × 14 5/16″, 23 7/8″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.7 Hz
Qts0.35
Qes0.38
Qms4.84
Vas2.98 ft³
Re3 Ω
Sd82.3 in²
Xmax0.33″
Vd27.5 in³ calc.
Mms156 g calc.
BL14.7 T·m calc.
EBP73 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.7 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 9/16″cutout Ø11 7/16″mounting depth 6 3/4″magnet Ø≈ 7 7/16″
Cutout diameter11 7/16″
Mounting depth6 3/4″
Overall diameter12 9/16″

“≈” 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 Audio System 12″ models