ARC Audio ARC 8D4

8″ subwoofer · dual 4 Ω · 150 W RMS

Fs 24.7 HzQts 0.33Vas 1.55 ft³Xmax 0.59″

Recommended box

For a sedan, one sub, 150 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)
Qtc0.81
Fc60 Hz
F3 (−3 dB, no cabin gain)57 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.99 ft³ (28 L)
Tuning (Fb)31 Hz
Portround port Ø3″, 17 9/16″ long
Port velocity at 150 W82 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)24 11/16″ × 15 3/4″ × 7 5/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24.7 Hz
Qts0.33
Qes0.367
Qms3.57
Vas1.55 ft³
Re (one coil)3.9 Ω
Sd35.8 in²
Xmax0.59″
Vd21.1 in³ calc.
Mms72 g calc.
BL10.9 T·m calc.
EBP67 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power150 W

Mounting dimensions

Ø8 5/16″cutout Ø7 1/8″mounting depth 4 3/4″magnet Ø≈ 4 5/8″
Cutout diameter7 1/8″
Mounting depth4 3/4″
Overall diameter8 5/16″

“≈” 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