Skar Audio ZVX-8 D4

8″ subwoofer · dual 4 Ω · 900 W RMS

Fs 40 HzQts 1.00Vas 0.58 ft³Xmax 0.55″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 900 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 volume0.67 ft³ (19 L)
Qtc1.37
Fc55 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 15 13/16″
Open sealed box in designer

Ported

Net volume1.13 ft³ (32 L)
Tuning (Fb)41 Hz
Portround port Ø2 1/2″, 5 3/16″ long
Port velocity at 900 W326 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)20 9/16″ × 15 3/4″ × 8 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40 Hz
Qts1.00
Qes1.15
Qms7.6
Vas0.58 ft³
Re (one coil)≈ 3.4 Ω
Sd29.1 in²
Xmax0.55″
Vd16.1 in³ calc.
Mms48 g calc.
BL6 T·m calc.
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m81.6 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power900 W

Mounting dimensions

Ø8 11/16″cutout Ø7 1/2″mounting depth 6 7/16″magnet Ø6 1/4″
Cutout diameter7 1/2″
Mounting depth6 7/16″
Overall diameter8 11/16″
Magnet diameter6 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