Massive Audio H124

12″ subwoofer · dual 4 Ω · 1,500 W RMS

Fs 43 HzQts 0.48Vas 0.79 ft³Xmax 0.56″

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 volume0.76 ft³ (21.5 L)
Qtc0.68
Fc61 Hz
F3 (−3 dB, no cabin gain)66 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 5/8″
Open sealed box in designer

Ported

Net volume1.59 ft³ (45 L)
Tuning (Fb)37 Hz
Portslot 2 3/4 × 14 5/16″, 43 5/16″ long
Port velocity at 1,500 W67 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs43 Hz
Qts0.48
Qes0.599
Qms2.38
Vas0.79 ft³
Re (one coil)3.2 Ω
Sd82.2 in²
Xmax0.56″
Vd46.2 in³ calc.
Mms245 g calc.
BL18.8 T·m calc.
EBP72 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.7 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,500 W

Mounting dimensions

Ø12 11/16″cutout Ø11 1/16″mounting depth 8 1/16″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth8 1/16″
Overall diameter12 11/16″

“≈” 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