MTX Audio FPR12-04

12″ subwoofer · 4 Ω · 400 W RMS

Fs 30 HzQts 0.80Vas 1.56 ft³Xmax 0.51″

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 volume1.91 ft³ (54 L)
Qtc1.08
Fc40 Hz
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/2″
Open sealed box in designer

Ported

Net volume3.25 ft³ (92 L)
Tuning (Fb)29 Hz
Portslot 1 15/16 × 14 5/16″, 23 3/16″ long
Port velocity at 400 W59 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.80
Qes0.94
Qms5.52
Vas1.56 ft³
Re3.36 Ω
Sd84.2 in²
Xmax0.51″
Vd43.1 in³ calc.
Mms267 g calc.
BL13.4 T·m calc.
EBP32 — suits sealed calc.
Sensitivity, 1 W / 1 m83 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/16″mounting depth 3 3/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth3 3/8″
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 MTX Audio 12″ models