DD Audio 812f D2

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

Fs 34 HzQts 0.55Vas 0.67 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 volume1.09 ft³ (31 L)
Qtc0.70
Fc43 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 13 7/16″
Open sealed box in designer

Ported

Net volume1.77 ft³ (50 L)
Tuning (Fb)28 Hz
Portround port Ø2 1/2″, 7 13/16″ long
Port velocity at 2,500 W703 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)20 1/2″ × 15 3/4″ × 13 3/8″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34 Hz
Qts0.55
Qes0.601
Qms6.28
Vas0.67 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax1.22″
EBP57 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power2,500 W

Mounting dimensions

Ø12 5/8″cutout Ø11 5/16″mounting depth 11″magnet Ø≈ 7 3/8″
Cutout diameter11 5/16″
Mounting depth11″
Overall diameter12 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 12″ models