DD Audio 3515i ESP D2

15″ subwoofer · dual 2 Ω · 1,200 W RMS

Fs 41 HzQts 0.88Vas 2.01 ft³Xmax 0.69″

Recommended box

For a sedan, one sub, 1,200 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)
Qtc1.15
Fc54 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)18 1/2″ × 18 1/2″ × 19 3/16″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)37 Hz
Portslot 3 9/16 × 17 7/8″, 19 3/16″ long
Port velocity at 1,200 W63 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 19 5/16″ × 19 15/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs41 Hz
Qts0.88
Qes1
Qms7.1
Vas2.01 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 124 in²
Xmax0.69″
EBP41 — suits sealed calc.
Sensitivity, 1 W / 1 m87.9 dB calc.

General

Size15″
Voice coilsdual 2 Ω
RMS power1,200 W

Mounting dimensions

Ø16 5/8″cutout Ø15 3/16″mounting depth 9 5/8″magnet Ø≈ 9 7/8″
Cutout diameter15 3/16″
Mounting depth9 5/8″
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