Infinity Kappa 120.9W

12″ subwoofer · 2 Ω · 350 W RMS

Fs 27.2 HzQts 0.46Vas 1.92 ft³Xmax 0.69″

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 volume0.92 ft³ (26 L)
Qtc0.80
Fc48 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 5/16″
Open sealed box in designer

Ported

Net volume3.04 ft³ (86 L)
Tuning (Fb)26 Hz
Portslot 1 3/4 × 14 5/16″, 28 7/8″ long
Port velocity at 350 W60 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27.2 Hz
Qts0.46
Qes0.51
Qms4.38
Vas1.92 ft³
Re2.1 Ω
Sd80.4 in²
Xmax0.69″
Vd55.4 in³ calc.
Mms240 g calc.
BL13 T·m calc.
EBP53 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.3 dB calc.

General

Size12″
Voice coils2 Ω
RMS power350 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/8″mounting depth 6 5/16″magnet Ø≈ 7 1/4″
Cutout diameter11 1/8″
Mounting depth6 5/16″
Overall diameter12 5/8″

“≈” 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