JL Audio 8W3v3-4

8″ subwoofer · 4 Ω · 250 W RMS

Fs 35.1 HzQts 0.47Vas 0.54 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 250 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 volume0.28 ft³ (8 L)
Qtc0.80
Fc60 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume0.92 ft³ (26 L)
Tuning (Fb)32 Hz
Portround port Ø3″, 17 13/16″ long
Port velocity at 250 W114 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)24″ × 15 3/4″ × 7 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.1 Hz
Qts0.47
Qes0.501
Qms7.07
Vas0.54 ft³
Re3.77 Ω
Sd32.1 in²
Xmax0.39″
Vd12.6 in³ calc.
Mms81 g calc.
BL11.6 T·m calc.
EBP70 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.2 dB calc.

General

Size8″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø8 9/16″cutout Ø7 1/16″mounting depth 4 5/8″magnet Ø4 3/4″
Cutout diameter7 1/16″
Mounting depth4 5/8″
Overall diameter8 9/16″
Magnet diameter4 3/4″

“≈” 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 JL Audio 8″ models