Helix IK S12-SVC2 (1x2 Ohm)

12″ subwoofer · 2 Ω · 300 W RMS

Fs 34 HzQts 0.46Vas 1.31 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 volume0.74 ft³ (21 L)
Qtc0.76
Fc57 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 7/16″
Open sealed box in designer

Ported

Net volume2.08 ft³ (59 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 24 3/8″ long
Port velocity at 300 W58 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34 Hz
Qts0.46
Qes0.5
Qms5.37
Vas1.31 ft³
Re≈ 1.7 Ω
Sd81.1 in²
Xmax0.31″
Vd25.5 in³ calc.
Mms229 g calc.
BL12.9 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.6 dB calc.

General

Size12″
Voice coils2 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