DD Audio SL715 D4

15″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 27.7 HzQts 0.65Vas 1.94 ft³

Recommended box

For a sedan, one sub, 1,000 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 volume2.83 ft³ (80 L)
Qtc0.85
Fc36 Hz
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 12″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)25 Hz
Portslot 3 1/8 × 16 5/16″, 39 13/16″ long
Port velocity at 1,000 W64 ft/s
F3 (−3 dB, no cabin gain)21 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 23 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.7 Hz
Qts0.65
Qes0.73
Qms6
Vas1.94 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 124 in²
Xmax≈ 0.39″
EBP38 — suits sealed calc.
Sensitivity, 1 W / 1 m84 dB calc.

General

Size15″
Voice coilsdual 4 Ω
RMS power1,000 W

Mounting dimensions

Ø15 3/8″cutout Ø13 7/8″mounting depth 6 3/4″magnet Ø6 11/16″
Cutout diameter13 7/8″
Mounting depth6 3/4″
Overall diameter15 3/8″
Magnet diameter6 11/16″

“≈” 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

Other DD Audio 15″ models