Diamond H122

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 25 HzQts 0.40Vas 1.47 ft³Xmax 0.70″

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)
Qtc0.71
Fc44 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.62 ft³ (46 L)
Tuning (Fb)27 Hz
Port2 round ports Ø2 1/2″, 20 11/16″ long
Port velocity at 600 W144 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)28 1/2″ × 15 3/4″ × 9 13/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25 Hz
Qts0.40
Qes0.45
Qms4
Vas1.47 ft³
Re (one coil)2 Ω
Sd76 in²
Xmax0.70″
Vd53.2 in³ calc.
Mms332 g calc.
BL15.2 T·m calc.
EBP56 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.6 dB calc.

General

Size12″
Voice coilsdual 2 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