Earthquake Pro-X158

15″ subwoofer · 8 Ω · 700 W RMS

Fs 42 HzQts 0.48Vas 4.27 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 700 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 volume2.40 ft³ (68 L)
Qtc0.80
Fc70 Hz
F3 (−3 dB, no cabin gain)66 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 10 5/16″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)44 Hz
Portslot 3 1/8 × 16 11/16″, 9 1/8″ long
Port velocity at 700 W65 ft/s
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 19 5/8″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs42 Hz
Qts0.48
Qes0.506
Qms9.18
Vas4.27 ft³
Re6 Ω
Sd≈ 124 in²
Xmax0.75″
EBP83 — sealed or ported calc.
Sensitivity, 1 W / 1 m94.5 dB calc.

General

Size15″
Voice coils8 Ω
RMS power700 W

Mounting dimensions

Ø15 5/16″cutout Ø14 3/16″mounting depth 5 3/4″magnet Ø≈ 9 3/16″
Cutout diameter14 3/16″
Mounting depth5 3/4″
Overall diameter15 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 15″ models