Audiofrog GB12D4

12″ subwoofer · dual 4 Ω · 500 W RMS

Fs 28.4 HzQts 0.49Vas 2.25 ft³Xmax 0.75″

Recommended box

For a sedan, one sub, 500 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 volume1.38 ft³ (39 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)44 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 17 3/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)29 Hz
Portslot 2 3/16 × 14 5/16″, 27 1/2″ long
Port velocity at 500 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.4 Hz
Qts0.49
Qes0.52
Qms8.82
Vas2.25 ft³
Re (one coil)4.2 Ω
Sd79.2 in²
Xmax0.75″
Vd59.2 in³ calc.
Mms182 g calc.
BL16.2 T·m calc.
EBP55 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power500 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/16″mounting depth 6 5/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth6 5/8″
Overall diameter12 5/8″

“≈” 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

Other Audiofrog 12″ models