Memphis Car Audio M71212 (M7 12", 1ohm setting)

12″ subwoofer · 1 Ω · 1,500 W RMS

Fs 36 HzQts 0.74Vas 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 volume1.31 ft³ (37 L)
Qtc0.90
Fc44 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)13 3/4″ × 13 3/4″ × 17 3/8″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)26 Hz
Portslot 3 3/8 × 14 5/16″, 59″ long
Port velocity at 1,500 W72 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 21 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36 Hz
Qts0.74
Qes0.81
Qms8.18
Vas0.65 ft³
Re1 Ω
Sd76.1 in²
Xmax0.77″
Vd58.7 in³ calc.
Mms364 g calc.
BL10.1 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m82.2 dB calc.

General

Size12″
Voice coils1 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