Earthquake Tremor-X124

12″ subwoofer · 4 Ω · 400 W RMS

Fs 31.2 HzQts 0.70Vas 4.10 ft³Xmax 1.13″

Recommended box

For a sedan, one sub, 400 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 volume1.73 ft³ (49 L)
Qtc1.28
Fc57 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)43 Hz
Portslot 1 9/16 × 14 5/16″, 7 3/16″ long
Port velocity at 400 W64 ft/s
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.2 Hz
Qts0.70
Qes1.034
Qms2.13
Vas4.10 ft³
Re≈ 3.4 Ω
Sd≈ 76 in²
Xmax1.13″
EBP30 — suits sealed calc.
Sensitivity, 1 W / 1 m87.3 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 7/16″cutout ≈ Ø11 3/16″mounting depth 5 1/2″magnet Ø≈ 7 1/4″
Cutout diameter≈ 11 3/16″
Mounting depth5 1/2″
Overall diameter12 7/16″

“≈” 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