Ascendant Audio Mayhem 12 D2

12″ subwoofer · dual 2 Ω · 4,500 W RMS

Fs 39.3 HzQts 0.40Vas 0.39 ft³Xmax 1.42″

Recommended box

For a sedan, one sub, 4,500 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 volume0.67 ft³ (19 L)
Qtc0.50
Fc49 Hz
F3 (−3 dB, no cabin gain)78 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.41 ft³ (40 L)
Tuning (Fb)26 Hz
Port2 round ports Ø2 1/2″, 26 1/16″ long
Port velocity at 4,500 W422 ft/s
F3 (−3 dB, no cabin gain)58 Hz
Example box (outside)30 13/16″ × 15 3/4″ × 8 7/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.3 Hz
Qts0.40
Qes0.43
Qms5.39
Vas0.39 ft³
Re (one coil)1.61 Ω
Sd74.6 in²
Xmax1.42″
Vd105.7 in³ calc.
Mms489 g calc.
BL21.3 T·m calc.
EBP91 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power4,500 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 7/8″

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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 Ascendant Audio 12″ models