Skar Audio VD-8 D4

8″ subwoofer · dual 4 Ω · 400 W RMS

Fs 45.3 HzQts 0.53Vas 0.28 ft³Xmax 0.41″

Recommended box

For a sedan, one sub, 400 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)
Qtc0.73
Fc62 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.71 ft³ (20 L)
Tuning (Fb)36 Hz
Portround port Ø2 1/2″, 12 11/16″ long
Port velocity at 400 W191 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)20 5/8″ × 15 3/4″ × 6 1/2″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45.3 Hz
Qts0.53
Qes0.62
Qms3.85
Vas0.28 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 33.3 in²
Xmax0.41″
EBP73 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.8 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø8 1/2″cutout Ø7 3/8″mounting depth 4″magnet Ø5 1/4″
Cutout diameter7 3/8″
Mounting depth4″
Overall diameter8 1/2″
Magnet diameter5 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 Skar Audio 8″ models