Audio System R12 FA EVO

12″ subwoofer · 4 Ω · 375 W RMS

Fs 37 HzQts 1.02Vas 0.95 ft³Xmax 1.02″

Recommended box

For a sedan, one sub, 375 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 volume1.77 ft³ (50 L)
Qtc1.27
Fc46 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 15/16″
Open sealed box in designer

Ported

Net volume3.00 ft³ (85 L)
Tuning (Fb)32 Hz
Portslot 1 15/16 × 14 5/16″, 20 1/8″ long
Port velocity at 375 W62 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37 Hz
Qts1.02
Qes1.14
Qms9.85
Vas0.95 ft³
Re3.3 Ω
Sd77.2 in²
Xmax1.02″
Vd79 in³ calc.
Mms241 g calc.
BL12.7 T·m calc.
EBP32 — suits sealed calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power375 W

Mounting dimensions

Ø12 1/2″cutout Ø11″mounting depth 6 5/16″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth6 5/16″
Overall diameter12 1/2″

“≈” 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