DD Audio 815f D1

15″ subwoofer · dual 1 Ω · 2,500 W RMS

Fs 34 HzQts 0.61Vas 2.21 ft³Xmax 1.22″

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 volume2.83 ft³ (80 L)
Qtc0.81
Fc45 Hz
F3 (−3 dB, no cabin gain)42 Hz
Example box (outside)16 15/16″ × 16 15/16″ × 23″
Open sealed box in designer

Ported

Net volume4.80 ft³ (136 L)
Tuning (Fb)30 Hz
Portslot 5 5/16 × 16 5/16″, 45 7/8″ long
Port velocity at 2,500 W65 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 17 11/16″ × 27 7/8″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34 Hz
Qts0.61
Qes0.669
Qms6.63
Vas2.21 ft³
Re (one coil)≈ 0.85 Ω
Sd≈ 124 in²
Xmax1.22″
EBP51 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.7 dB calc.

General

Size15″
Voice coilsdual 1 Ω
RMS power2,500 W

Mounting dimensions

Ø15 3/8″cutout Ø13 3/4″mounting depth 11 1/2″magnet Ø≈ 8 15/16″
Cutout diameter13 3/4″
Mounting depth11 1/2″
Overall diameter15 3/8″

“≈” 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