Helix Q 12W (2x2 Ohm)

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

Fs 35 HzQts 0.38Vas 0.87 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 1,000 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 volume0.78 ft³ (22 L)
Qtc0.55
Fc51 Hz
F3 (−3 dB, no cabin gain)72 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume1.59 ft³ (45 L)
Tuning (Fb)30 Hz
Portslot 1 3/4 × 14 5/16″, 43 5/16″ long
Port velocity at 1,000 W84 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.38
Qes0.41
Qms4.61
Vas0.87 ft³
Re (one coil)1.95 Ω
Sd83.5 in²
Xmax0.55″
Vd46 in³ calc.
Mms345 g calc.
BL19 T·m calc.
EBP85 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.1 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø12 13/16″cutout Ø11 3/16″mounting depth 7 3/8″magnet Ø≈ 7 1/4″
Cutout diameter11 3/16″
Mounting depth7 3/8″
Overall diameter12 13/16″

“≈” 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 Helix 12″ models