Memphis Car Audio M71512 (M7 15", 1ohm setting)

15″ subwoofer · 1 Ω · 1,500 W RMS

Fs 30 HzQts 0.70Vas 2.85 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 volume3.11 ft³ (88 L)
Qtc0.97
Fc42 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 12 3/4″
Open sealed box in designer

Ported

Net volume5.26 ft³ (149 L)
Tuning (Fb)30 Hz
Portslot 3 15/16 × 16 11/16″, 30 3/8″ long
Port velocity at 1,500 W65 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 24 5/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts0.70
Qes0.78
Qms6.53
Vas2.85 ft³
Re1 Ω
Sd135.8 in²
Xmax0.77″
Vd104.8 in³ calc.
Mms379 g calc.
BL9.6 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size15″
Voice coils1 Ω
RMS power1,500 W

Mounting dimensions

Ø15 3/4″cutout Ø14 1/16″mounting depth 9 5/8″magnet Ø7 1/2″
Cutout diameter14 1/16″
Mounting depth9 5/8″
Overall diameter15 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 15″ models