Memphis Car Audio MJP1244 (MOJO Pro 12" DVC 4ohm)

12″ subwoofer · dual 4 Ω · 750 W RMS

Fs 36.7 HzQts 0.69Vas 1.09 ft³Xmax 0.51″

Recommended box

For a sedan, one sub, 750 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 volume1.87 ft³ (53 L)
Qtc0.87
Fc46 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/8″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)30 Hz
Portslot 2 3/4 × 14 5/16″, 31 11/16″ long
Port velocity at 750 W66 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 18 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36.7 Hz
Qts0.69
Qes0.764
Qms7.22
Vas1.09 ft³
Re (one coil)3.46 Ω
Sd82.3 in²
Xmax0.51″
Vd42.1 in³ calc.
Mms243 g calc.
BL15.9 T·m calc.
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m85 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power750 W

Mounting dimensions

Ø12 15/16″cutout Ø11 5/16″mounting depth 6 1/4″magnet Ø6 11/16″
Cutout diameter11 5/16″
Mounting depth6 1/4″
Overall diameter12 15/16″
Magnet diameter6 11/16″

“≈” 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