Sundown Audio M12 D1

12″ subwoofer · dual 1 Ω · 2,000 W RMS

Fs 31.9 HzQts 0.61Vas 1.39 ft³Xmax 1.38″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 2,000 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)
Qtc0.81
Fc43 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 20 15/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)29 Hz
Portslot 4 1/8 × 14 5/16″, 57 7/8″ long
Port velocity at 2,000 W64 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 22 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.9 Hz
Qts0.61
Qes0.696
Qms4.65
Vas1.39 ft³
Re (one coil)1.11 Ω
Sd≈ 76 in²
Xmax1.38″
EBP46 — suits sealed calc.
Sensitivity, 1 W / 1 m84.6 dB calc.

General

Size12″
Voice coilsdual 1 Ω
RMS power2,000 W

Mounting dimensions

Ø12 11/16″cutout Ø11 1/8″mounting depth 10 7/8″magnet Ø7 7/8″
Cutout diameter11 1/8″
Mounting depth10 7/8″
Overall diameter12 11/16″
Magnet diameter7 7/8″

The spec sheet's Sd of 114 in² is the area of a 12″ circle, not the cone's radiating area — not used.

“≈” 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 Sundown Audio 12″ models