JBL GTO804

8″ subwoofer · 4 Ω · 200 W RMS

Fs 29.6 HzQts 0.42Vas 0.58 ft³Xmax 0.45″

Recommended box

For a sedan, one sub, 200 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 volume0.32 ft³ (9 L)
Qtc0.71
Fc50 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.71 ft³ (20 L)
Tuning (Fb)34 Hz
Portround port Ø2 1/2″, 14 1/2″ long
Port velocity at 200 W131 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)19 3/8″ × 15 3/4″ × 6 7/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.6 Hz
Qts0.42
Qes0.45
Qms6.37
Vas0.58 ft³
Re3.49 Ω
Sd33.2 in²
Xmax0.45″
Vd15 in³ calc.
Mms114 g calc.
BL12.8 T·m calc.
EBP66 — sealed or ported calc.
Sensitivity, 1 W / 1 m81.8 dB calc.

General

Size8″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø8 1/4″cutout Ø7 1/16″mounting depth 4 5/16″magnet Ø≈ 4 9/16″
Cutout diameter7 1/16″
Mounting depth4 5/16″
Overall diameter8 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 8″ models