Earthquake Subzero 12

12″ subwoofer · dual 4 Ω

Fs 26.8 HzQts 0.42Vas 2.05 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 volume0.81 ft³ (23 L)
Qtc0.80
Fc50 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 10 9/16″
Open sealed box in designer

Ported

Net volume2.61 ft³ (74 L)
Tuning (Fb)27 Hz
Portslot 1 9/16 × 14 5/16″, 27 3/4″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.8 Hz
Qts0.42
Qes0.441
Qms10.87
Vas2.05 ft³
Re (one coil)3.85 Ω
Sd82.2 in²
Xmax1.25″
Vd102.8 in³ calc.
Mms241 g calc.
BL18.8 T·m calc.
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m86 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power—

Mounting dimensions

Ø≈ 12 11/16″cutout Ø11 1/2″mounting depth 7 5/16″magnet Ø≈ 7 1/2″
Cutout diameter11 1/2″
Mounting depth7 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