JBL W12GTi / W12GTi MkII

12″ subwoofer · dual 6 Ω · 700 W RMS

Fs 31.8 HzQts 0.51Vas 1.58 ft³Xmax 0.80″

Recommended box

For a sedan, one sub, 700 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
Fc50 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 13 13/16″
Open sealed box in designer

Ported

Net volume2.90 ft³ (82 L)
Tuning (Fb)29 Hz
Portslot 2 9/16 × 14 5/16″, 35 1/4″ long
Port velocity at 700 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 1/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.8 Hz
Qts0.51
Qes0.55
Qms6.68
Vas1.58 ft³
Re (one coil)6.4 Ω
Sd74.4 in²
Xmax0.80″
Vd59.5 in³ calc.
Mms182 g calc.
BL20.6 T·m calc.
EBP58 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 6 Ω
RMS power700 W

Mounting dimensions

Ø12 5/16″cutout Ø11″mounting depth 10 1/4″magnet Ø≈ 7 1/8″
Cutout diameter11″
Mounting depth10 1/4″
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