Crunch GTi124

12″ subwoofer · 4 Ω · 300 W RMS

Fs 28 HzQts 0.68Vas 2.07 ft³Xmax 0.37″

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 volume1.87 ft³ (53 L)
Qtc0.99
Fc41 Hz
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/8″
Open sealed box in designer

Ported

Net volume3.14 ft³ (89 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 17 3/8″ long
Port velocity at 300 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.68
Qes0.746
Qms7.94
Vas2.07 ft³
Re3.8 Ω
Sd81.4 in²
Xmax0.37″
Vd30.4 in³ calc.
Mms216 g calc.
BL13.9 T·m calc.
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m84.4 dB calc.

General

Size12″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø12 3/8″cutout Ø11 1/8″mounting depth 3 7/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth3 7/8″
Overall diameter12 3/8″

“≈” 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