Memphis Car Audio MJ1212 (MOJO 12", 1ohm setting)

12″ subwoofer · 1 Ω · 1,500 W RMS

Fs 33 HzQts 0.44Vas 0.74 ft³Xmax 1.00″

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 volume0.79 ft³ (22.5 L)
Qtc0.62
Fc46 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)29 Hz
Portround port Ø3″, 13 1/4″ long
Port velocity at 1,500 W328 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)21 11/16″ × 15 3/4″ × 11″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs33 Hz
Qts0.44
Qes0.548
Qms2.32
Vas0.74 ft³
Re1 Ω
Sd76 in²
Xmax1.00″
Vd76 in³ calc.
Mms379 g calc.
BL12 T·m calc.
EBP60 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.4 dB calc.

General

Size12″
Voice coils1 Ω
RMS power1,500 W

Mounting dimensions

Ø12 13/16″cutout Ø11″mounting depth 8 1/2″magnet Ø9 5/16″
Cutout diameter11″
Mounting depth8 1/2″
Overall diameter12 13/16″
Magnet diameter9 5/16″

“≈” 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 Memphis Car Audio 12″ models