Helix IK S12-DVC2 (2x2 Ohm)

12″ subwoofer · dual 2 Ω · 300 W RMS

Fs 36 HzQts 0.47Vas 1.41 ft³Xmax 0.31″

Recommended box

For a sedan, one sub, 300 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)
Qtc0.80
Fc60 Hz
F3 (−3 dB, no cabin gain)58 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 13/16″
Open sealed box in designer

Ported

Net volume2.51 ft³ (71 L)
Tuning (Fb)33 Hz
Portslot 1 3/4 × 14 5/16″, 20 11/16″ long
Port velocity at 300 W59 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs36 Hz
Qts0.47
Qes0.52
Qms5.41
Vas1.41 ft³
Re (one coil)1.8 Ω
Sd81.1 in²
Xmax0.31″
Vd25.5 in³ calc.
Mms189 g calc.
BL12.2 T·m calc.
EBP69 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.6 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø12 7/16″cutout Ø10 7/8″mounting depth 3 3/4″magnet Ø≈ 7 1/16″
Cutout diameter10 7/8″
Mounting depth3 3/4″
Overall diameter12 7/16″

“≈” 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