Infinity Kappa 122.7W

12″ subwoofer · dual 2 Ω · 350 W RMS

Fs 20.6 HzQts 0.46Vas 3.47 ft³Xmax 0.47″

Recommended box

For a sedan, one sub, 350 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 volume1.70 ft³ (48 L)
Qtc0.80
Fc36 Hz
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 5/8″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)25 Hz
Portslot 1 9/16 × 14 5/16″, 26 7/16″ long
Port velocity at 350 W64 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/2″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs20.6 Hz
Qts0.46
Qes0.49
Qms7.35
Vas3.47 ft³
Re (one coil)2 Ω
Sd82.2 in²
Xmax0.47″
Vd38.8 in³ calc.
Mms242 g calc.
BL11.3 T·m calc.
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m84.4 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power350 W

Mounting dimensions

Ø12 7/16″cutout Ø11 1/8″mounting depth 5″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth5″
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 Infinity 12″ models