Infinity Kappa 120.3DVC

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 26.8 HzQts 0.43Vas 2.47 ft³Xmax 0.53″

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 volume0.99 ft³ (28 L)
Qtc0.80
Fc50 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 13 1/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)28 Hz
Portslot 1 9/16 × 14 5/16″, 22 5/16″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.8 Hz
Qts0.43
Qes0.47
Qms4.93
Vas2.47 ft³
Re (one coil)4.64 Ω
Sd76.1 in²
Xmax0.53″
Vd40.4 in³ calc.
Mms172 g calc.
BL16.9 T·m calc.
EBP57 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.6 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø13 3/16″cutout Ø10 15/16″mounting depth 6 5/16″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth6 5/16″
Overall diameter13 3/16″

“≈” 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