SoundQubed HDX312 D2

12″ subwoofer · dual 2 Ω · 1,500 W RMS

Fs 26.9 HzQts 0.32Vas 1.01 ft³Xmax 1.42″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 1,500 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 volume0.88 ft³ (25 L)
Qtc0.47
Fc39 Hz
F3 (−3 dB, no cabin gain)69 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 11 5/16″
Open sealed box in designer

Ported

Net volume1.52 ft³ (43 L)
Tuning (Fb)25 Hz
Portround port Ø2 1/2″, 12 3/16″ long
Port velocity at 1,500 W476 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)21 3/4″ × 15 3/4″ × 11 7/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.9 Hz
Qts0.32
Qes0.341
Qms4.95
Vas1.01 ft³
Re (one coil)≈ 1.7 Ω
Sd79.1 in²
Xmax1.42″
Vd112 in³ calc.
Mms450 g calc.
BL19.5 T·m calc.
EBP79 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,500 W

Mounting dimensions

Ø≈ 12 11/16″cutout Ø11 1/2″mounting depth 8 7/8″magnet Ø≈ 7 1/2″
Cutout diameter11 1/2″
Mounting depth8 7/8″

“≈” 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 SoundQubed 12″ models