DD Audio 1012c D4

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 28 HzQts 0.71Vas 1.95 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 400 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 volume1.73 ft³ (49 L)
Qtc1.04
Fc41 Hz
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)30 Hz
Portslot 1 3/4 × 14 5/16″, 21 9/16″ long
Port velocity at 400 W61 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.71
Qes0.804
Qms6.31
Vas1.95 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 76 in²
Xmax0.55″
EBP35 — suits sealed calc.
Sensitivity, 1 W / 1 m83.8 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø12 1/4″cutout Ø11 1/8″mounting depth 6 5/16″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth6 5/16″
Overall diameter12 1/4″

“≈” 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