Power Acoustik MOFO-122X

12″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 28.9 HzQts 0.40Vas 1.37 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 1,500 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 volume0.71 ft³ (20 L)
Qtc0.68
Fc50 Hz
F3 (−3 dB, no cabin gain)54 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 9 9/16″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)31 Hz
Portslot 1 3/4 × 14 5/16″, 44 5/8″ long
Port velocity at 1,500 W92 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 1/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.9 Hz
Qts0.40
Qes0.429
Qms5.56
Vas1.37 ft³
Re (one coil)1.96 Ω
Sd≈ 76 in²
Xmax0.59″
EBP67 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.4 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/4″mounting depth 6 7/8″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 7/8″
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 Power Acoustik 12″ models