Diamond HXP122

12″ subwoofer · dual 2 Ω · 900 W RMS

Fs 23 HzQts 0.46Vas 1.54 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 900 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 volume0.78 ft³ (22 L)
Qtc0.79
Fc40 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume2.47 ft³ (70 L)
Tuning (Fb)25 Hz
Portslot 2 3/8 × 14 5/16″, 53 3/4″ long
Port velocity at 900 W65 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs23 Hz
Qts0.46
Qes0.53
Qms3.5
Vas1.54 ft³
Re (one coil)1.93 Ω
Sd75.5 in²
Xmax0.75″
Vd56.5 in³ calc.
Mms370 g calc.
BL14 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m82 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power900 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/8″mounting depth 8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth8″
Overall diameter12 5/8″

“≈” 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