Earthquake Subzero 15

15″ subwoofer · dual 4 Ω

Fs 24.5 HzQts 0.30Vas 4.58 ft³Xmax 1.25″

Recommended box

For a sedan, one sub, 300 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 volume1.31 ft³ (37 L)
Qtc0.64
Fc52 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)17 11/16″ × 17 11/16″ × 11 1/16″
Open sealed box in designer

Ported

Net volume2.65 ft³ (75 L)
Tuning (Fb)31 Hz
Portslot 1 9/16 × 17 1/16″, 24″ long
Port velocity at 300 W52 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 18 1/2″ × 12 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24.5 Hz
Qts0.30
Qes0.31
Qms12.66
Vas4.58 ft³
Re (one coil)3.9 Ω
Sd138 in²
Xmax1.25″
Vd172.7 in³ calc.
Mms366 g calc.
BL26.6 T·m calc.
EBP79 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.9 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power—

Mounting dimensions

Ø≈ 15 11/16″cutout Ø14 1/2″mounting depth 8 11/16″magnet Ø≈ 9 7/16″
Cutout diameter14 1/2″
Mounting depth8 11/16″

“≈” 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