Diamond H124

12″ subwoofer · dual 4 Ω · 600 W RMS

Fs 29 HzQts 0.45Vas 1.47 ft³Xmax 0.65″

Recommended box

For a sedan, one sub, 600 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 volume0.71 ft³ (20 L)
Qtc0.79
Fc51 Hz
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume2.22 ft³ (63 L)
Tuning (Fb)28 Hz
Portslot 1 15/16 × 14 5/16″, 38 7/8″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.45
Qes0.52
Qms3.3
Vas1.47 ft³
Re (one coil)3.5 Ω
Sd76 in²
Xmax0.65″
Vd49.3 in³ calc.
Mms247 g calc.
BL17.4 T·m calc.
EBP56 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.9 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø12 1/2″cutout Ø10 15/16″mounting depth 7 3/8″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth7 3/8″
Overall diameter12 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 Diamond 12″ models