Infinity Kappa Perfect 12D VQ (Low-Q setting)

12″ subwoofer · dual 4 Ω · 400 W RMS

Fs 22 HzQts 0.30Vas 3.33 ft³Xmax 0.66″

Recommended box

For a sedan, one sub, 400 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 volume0.71 ft³ (20 L)
Qtc0.72
Fc53 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 1/16″
Open sealed box in designer

Ported

Net volume1.59 ft³ (45 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 38 1/4″ long
Port velocity at 400 W52 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs22 Hz
Qts0.30
Qes0.31
Qms10.52
Vas3.33 ft³
Re (one coil)3.32 Ω
Sd76.1 in²
Xmax0.66″
Vd50.3 in³ calc.
Mms189 g calc.
BL16.7 T·m calc.
EBP71 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.1 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø12 3/8″cutout Ø10 7/8″mounting depth 7″magnet Ø≈ 7 1/16″
Cutout diameter10 7/8″
Mounting depth7″
Overall diameter12 3/8″

“≈” 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 Infinity 12″ models