JBL GT5-15

15″ subwoofer · 4 Ω · 300 W RMS

Fs 27.3 HzQts 0.67Vas 3.76 ft³Xmax 0.57″

Recommended box

For a sedan, one sub, 300 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 volume3.04 ft³ (86 L)
Qtc1.00
Fc41 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 12 1/2″
Open sealed box in designer

Ported

Net volume5.12 ft³ (145 L)
Tuning (Fb)30 Hz
Portslot 1 3/4 × 16 11/16″, 12 11/16″ long
Port velocity at 300 W60 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 18 1/8″ × 20 5/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.3 Hz
Qts0.67
Qes0.76
Qms5.7
Vas3.76 ft³
Re3.63 Ω
Sd132.5 in²
Xmax0.57″
Vd75.7 in³ calc.
Mms330 g calc.
BL16.5 T·m calc.
EBP36 — suits sealed calc.
Sensitivity, 1 W / 1 m86.6 dB calc.

General

Size15″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø15 3/8″cutout Ø14″mounting depth 7 5/16″magnet Ø≈ 9 1/16″
Cutout diameter14″
Mounting depth7 5/16″
Overall diameter15 3/8″

“≈” 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