Memphis Car Audio MJM822 (MOJO Mini 8" DVC 2ohm)

8″ subwoofer · dual 2 Ω · 900 W RMS

Fs 44.2 HzQts 0.54Vas 0.24 ft³Xmax 0.49″

Recommended box

For a sedan, one sub, 900 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 volume0.30 ft³ (8.5 L)
Qtc0.73
Fc59 Hz
F3 (−3 dB, no cabin gain)60 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 1/4″
Open sealed box in designer

Ported

Net volume0.64 ft³ (18 L)
Tuning (Fb)39 Hz
Portround port Ø2 1/2″, 11 15/16″ long
Port velocity at 900 W296 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)13 15/16″ × 15 3/4″ × 8 1/4″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs44.2 Hz
Qts0.54
Qes0.6
Qms5.9
Vas0.24 ft³
Re (one coil)≈ 1.7 Ω
Sd32.7 in²
Xmax0.49″
Vd16 in³ calc.
Mms120 g calc.
BL9.7 T·m calc.
EBP74 — sealed or ported calc.
Sensitivity, 1 W / 1 m81.9 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power900 W

Mounting dimensions

Ø8 11/16″cutout Ø7 5/16″mounting depth 5 3/4″magnet Ø6 1/8″
Cutout diameter7 5/16″
Mounting depth5 3/4″
Overall diameter8 11/16″
Magnet diameter6 1/8″

“≈” 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 Memphis Car Audio 8″ models