Massive Audio MMA124

12″ subwoofer · dual 4 Ω · 500 W RMS

Fs 34.9 HzQts 0.63Vas 1.93 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 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 volume1.80 ft³ (51 L)
Qtc0.91
Fc50 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)35 Hz
Portslot 2 3/16 × 14 5/16″, 17 7/16″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 11/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.9 Hz
Qts0.63
Qes0.71
Qms6.01
Vas1.93 ft³
Re (one coil)3.4 Ω
Sd79.1 in²
Xmax0.39″
Vd31.1 in³ calc.
Mms140 g calc.
BL12.1 T·m calc.
EBP49 — suits sealed calc.
Sensitivity, 1 W / 1 m87.2 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø12 5/16″cutout Ø10 13/16″mounting depth 6″magnet Ø≈ 7″
Cutout diameter10 13/16″
Mounting depth6″
Overall diameter12 5/16″

“≈” 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 Massive Audio 12″ models