JBL GTO1214

12″ subwoofer · 4 Ω · 350 W RMS

Fs 28 HzQts 0.47Vas 2.06 ft³Xmax 0.57″

Recommended box

For a sedan, one sub, 350 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 volume1.06 ft³ (30 L)
Qtc0.80
Fc48 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 13 13/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)28 Hz
Portslot 1 3/4 × 14 5/16″, 24″ long
Port velocity at 350 W65 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.47
Qes0.49
Qms10.7
Vas2.06 ft³
Re3.76 Ω
Sd79.2 in²
Xmax0.57″
Vd45.2 in³ calc.
Mms205 g calc.
BL16.6 T·m calc.
EBP57 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

Ø12 5/16″cutout Ø10 15/16″mounting depth 6 5/16″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth6 5/16″
Overall diameter12 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 JBL 12″ models