JBL GT5-12

12″ subwoofer · 4 Ω · 275 W RMS

Fs 29 HzQts 0.58Vas 1.91 ft³Xmax 0.56″

Recommended box

For a sedan, one sub, 275 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)
Qtc0.83
Fc41 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 3/8″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)29 Hz
Portslot 1 9/16 × 14 5/16″, 18 5/8″ long
Port velocity at 275 W64 ft/s
F3 (−3 dB, no cabin gain)25 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

Fs29 Hz
Qts0.58
Qes0.64
Qms6.39
Vas1.91 ft³
Re4 Ω
Sd82.2 in²
Xmax0.56″
Vd45.9 in³ calc.
Mms221 g calc.
BL15.9 T·m calc.
EBP45 — suits sealed calc.
Sensitivity, 1 W / 1 m85.2 dB calc.

General

Size12″
Voice coils4 Ω
RMS power275 W

Mounting dimensions

Ø12 5/16″cutout Ø11 1/4″mounting depth 6 7/16″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth6 7/16″
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