Hifonics HWX12D4 (12" DVC 4ohm)

12″ subwoofer · dual 4 Ω · 350 W RMS

Fs 29.5 HzQts 0.90Vas 3.11 ft³Xmax 0.30″

Recommended box

For a sedan, one sub, 350 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 volume1.80 ft³ (51 L)
Qtc1.49
Fc49 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 9 1/16″
Open sealed box in designer

Ported

Net volume3.04 ft³ (86 L)
Tuning (Fb)39 Hz
Portslot 1 3/4 × 14 5/16″, 10 1/2″ long
Port velocity at 350 W60 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 13/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.5 Hz
Qts0.90
Qes1.059
Qms6.2
Vas3.11 ft³
Re (one coil)3.62 Ω
Sd78.6 in²
Xmax0.30″
Vd23.2 in³ calc.
Mms121 g calc.
BL8.7 T·m calc.
EBP28 — suits sealed calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power350 W

Mounting dimensions

Ø≈ 12″cutout Ø10 13/16″mounting depth 5 3/16″magnet Ø≈ 7 1/16″
Cutout diameter10 13/16″
Mounting depth5 3/16″

“≈” 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 Hifonics 12″ models