DD Audio 9915b ESP D2

15″ subwoofer · dual 2 Ω · 2,500 W RMS

Fs 34.3 HzQts 0.40Vas 1.92 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 2,500 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 volume1.75 ft³ (49.5 L)
Qtc0.58
Fc50 Hz
F3 (−3 dB, no cabin gain)65 Hz
Example box (outside)18 1/2″ × 18 1/2″ × 12 13/16″
Open sealed box in designer

Ported

Net volume2.37 ft³ (67 L)
Tuning (Fb)34 Hz
Portslot 3 1/8 × 17 7/8″, 48 13/16″ long
Port velocity at 2,500 W74 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 19 5/16″ × 15 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.3 Hz
Qts0.40
Qes0.426
Qms6.55
Vas1.92 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax0.87″
EBP81 — sealed or ported calc.
Sensitivity, 1 W / 1 m89.1 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power2,500 W

Mounting dimensions

Ø16 5/8″cutout Ø15 3/16″mounting depth 10 5/16″magnet Ø≈ 9 7/8″
Cutout diameter15 3/16″
Mounting depth10 5/16″
Overall diameter16 5/8″

“≈” 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