JBL GTO1214D

12″ subwoofer · dual 4 Ω · 350 W RMS

Fs 28.3 HzQts 0.49Vas 2.33 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 volume1.38 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 1 3/4 × 14 5/16″, 22 1/8″ long
Port velocity at 350 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28.3 Hz
Qts0.49
Qes0.51
Qms11.14
Vas2.33 ft³
Re (one coil)3.78 Ω
Sd79.2 in²
Xmax0.57″
Vd45.2 in³ calc.
Mms177 g calc.
BL15.3 T·m calc.
EBP55 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.7 dB calc.

General

Size12″
Voice coilsdual 4 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