Helix IQ W8-DVC2 (2x2 Ohm)

8″ subwoofer · dual 2 Ω · 750 W RMS

Fs 43 HzQts 0.45Vas 0.30 ft³Xmax 0.47″

Recommended box

For a sedan, one sub, 750 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 volume0.32 ft³ (9 L)
Qtc0.63
Fc60 Hz
F3 (−3 dB, no cabin gain)71 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.67 ft³ (19 L)
Tuning (Fb)35 Hz
Portround port Ø2 1/2″, 14 3/8″ long
Port velocity at 750 W262 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)18″ × 15 3/4″ × 7 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs43 Hz
Qts0.45
Qes0.49
Qms5.3
Vas0.30 ft³
Re (one coil)1.9 Ω
Sd34.4 in²
Xmax0.47″
Vd16.3 in³ calc.
Mms113 g calc.
BL10.9 T·m calc.
EBP88 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.4 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power750 W

Mounting dimensions

Ø8 7/8″cutout Ø7 3/16″mounting depth 4 1/2″magnet Ø≈ 4 11/16″
Cutout diameter7 3/16″
Mounting depth4 1/2″
Overall diameter8 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 Helix 8″ models