Audio System R 12 FLAT

12″ subwoofer · 4 Ω · 375 W RMS

Fs 25.7 HzQts 0.58Vas 2.86 ft³Xmax 0.28″

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 volume1.80 ft³ (51 L)
Qtc0.93
Fc41 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)30 Hz
Portslot 1 3/4 × 14 5/16″, 20 3/8″ long
Port velocity at 375 W59 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 3/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25.7 Hz
Qts0.58
Qes0.67
Qms4.37
Vas2.86 ft³
Re3.2 Ω
Sd79.8 in²
Xmax0.28″
Vd22 in³ calc.
Mms178 g calc.
BL11.7 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m85.1 dB calc.

General

Size12″
Voice coils4 Ω
RMS power375 W

Mounting dimensions

Ø12 9/16″cutout Ø10 15/16″mounting depth 4 15/16″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth4 15/16″
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