DD Audio 9912c D2

12″ subwoofer · dual 2 Ω · 3,200 W RMS

Fs 31.6 HzQts 0.35Vas 0.83 ft³Xmax 1.26″

Recommended box

For a sedan, one sub, 3,200 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 volume1.09 ft³ (31 L)
Qtc0.47
Fc42 Hz
F3 (−3 dB, no cabin gain)73 Hz
Example box (outside)15 3/8″ × 15 3/8″ × 12 1/8″
Open sealed box in designer

Ported

Net volume1.45 ft³ (41 L)
Tuning (Fb)28 Hz
Portround port Ø2 1/2″, 9 7/8″ long
Port velocity at 3,200 W728 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)18 7/8″ × 16 1/8″ × 12 3/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.6 Hz
Qts0.35
Qes0.377
Qms5.4
Vas0.83 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax1.26″
EBP84 — sealed or ported calc.
Sensitivity, 1 W / 1 m85 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power3,200 W

Mounting dimensions

Ø13 3/8″cutout Ø12 3/16″mounting depth 9 11/16″magnet Ø10 5/16″
Cutout diameter12 3/16″
Mounting depth9 11/16″
Overall diameter13 3/8″
Magnet diameter10 5/16″

“≈” 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 12″ models