Audioque SDC2.08 D4

8″ subwoofer · dual 4 Ω · 250 W RMS

Fs 50 HzQts 0.46Vas 0.19 ft³

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 volume0.32 ft³ (9 L)
Qtc0.58
Fc63 Hz
F3 (−3 dB, no cabin gain)82 Hz
Example box (outside)11″ × 11″ × 8″
Open sealed box in designer

Ported

Net volume0.64 ft³ (18 L)
Tuning (Fb)35 Hz
Portround port Ø2 1/2″, 15 1/4″ long
Port velocity at 250 W152 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)19 1/8″ × 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

Fs50 Hz
Qts0.46
Qes0.51
Qms4.5
Vas0.19 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 33.3 in²
Xmax≈ 0.39″
EBP98 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.1 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø≈ 9 1/8″cutout Ø7 15/16″mounting depth 4″magnet Ø≈ 5 3/16″
Cutout diameter7 15/16″
Mounting depth4″

“≈” 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