DD Audio 1508d D4

8″ subwoofer · dual 4 Ω · 600 W RMS

Fs 43.7 HzQts 0.89Vas 0.22 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 600 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 volume0.46 ft³ (13 L)
Qtc1.09
Fc53 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 12 3/8″
Open sealed box in designer

Ported

Net volume1.31 ft³ (37 L)
Tuning (Fb)29 Hz
Port2 round ports Ø2 1/2″, 22 7/16″ long
Port velocity at 600 W156 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)28 7/8″ × 15 3/4″ × 8 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs43.7 Hz
Qts0.89
Qes1.02
Qms7.1
Vas0.22 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 33.3 in²
Xmax0.39″
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m79.2 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø8 1/4″cutout Ø7 1/8″mounting depth 5 1/2″magnet Ø≈ 4 5/8″
Cutout diameter7 1/8″
Mounting depth5 1/2″
Overall diameter8 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 DD Audio 8″ models