Earthquake Pro-X128

12″ subwoofer · 8 Ω · 600 W RMS

Fs 49 HzQts 0.35Vas 2.33 ft³Xmax 0.50″

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)
Qtc0.72
Fc102 Hz
F3 (−3 dB, no cabin gain)107 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.66 ft³ (47 L)
Tuning (Fb)50 Hz
Portslot 2 3/16 × 14 5/16″, 15 3/8″ long
Port velocity at 600 W61 ft/s
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 13/16″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs49 Hz
Qts0.35
Qes0.362
Qms7.62
Vas2.33 ft³
Re6 Ω
Sd≈ 76 in²
Xmax0.50″
EBP135 — suits ported calc.
Sensitivity, 1 W / 1 m95.3 dB calc.

General

Size12″
Voice coils8 Ω
RMS power600 W

Mounting dimensions

Ø12 5/16″cutout Ø11 3/16″mounting depth 4 13/16″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth4 13/16″
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 Earthquake 12″ models