Memphis Car Audio M71212 (M7 12", 2ohm setting)

12″ subwoofer · 2 Ω · 1,500 W RMS

Fs 36 HzQts 0.63Vas 0.65 ft³Xmax 0.77″

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 volume1.02 ft³ (29 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 14 3/16″
Open sealed box in designer

Ported

Net volume2.54 ft³ (72 L)
Tuning (Fb)26 Hz
Portslot 2 9/16 × 14 5/16″, 52 1/16″ long
Port velocity at 1,500 W88 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 7/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36 Hz
Qts0.63
Qes0.68
Qms8.16
Vas0.65 ft³
Re1.9 Ω
Sd76.1 in²
Xmax0.77″
Vd58.7 in³ calc.
Mms364 g calc.
BL15.2 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m83 dB calc.

General

Size12″
Voice coils2 Ω
RMS power1,500 W

Mounting dimensions

Ø12 3/4″cutout Ø10 13/16″mounting depth 8 3/4″magnet Ø7 1/2″
Cutout diameter10 13/16″
Mounting depth8 3/4″
Overall diameter12 3/4″
Magnet diameter7 1/2″

“≈” 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