JBL 1500GTi

15″ subwoofer · 4 Ω · 600 W RMS

Fs 35 HzQts 0.34Vas 6.67 ft³Xmax 0.22″

Recommended box

For a sedan, one sub, 600 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 volume1.45 ft³ (41 L)
Qtc0.80
Fc83 Hz
F3 (−3 dB, no cabin gain)79 Hz
Example box (outside)17 5/16″ × 17 5/16″ × 12 1/2″
Open sealed box in designer

Ported

Net volume4.48 ft³ (127 L)
Tuning (Fb)42 Hz
Portslot 2 3/4 × 16 11/16″, 9 15/16″ long
Port velocity at 600 W63 ft/s
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 18 1/2″
Open ported box in designer
2030405060801001502007278849096102HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.34
Qes0.36
Qms5.8
Vas6.67 ft³
Re2.5 Ω
Sd135.9 in²
Xmax0.22″
Vd29.4 in³ calc.
Mms119 g calc.
BL13.5 T·m calc.
EBP97 — sealed or ported calc.
Sensitivity, 1 W / 1 m95.5 dB calc.

General

Size15″
Voice coils4 Ω
RMS power600 W

Mounting dimensions

Ø15 1/4″cutout Ø14″mounting depth 5 1/4″magnet Ø≈ 9 1/8″
Cutout diameter14″
Mounting depth5 1/4″
Overall diameter15 1/4″

“≈” 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 15″ models