Kicx LL12 (2+2)

12″ subwoofer · dual 2 Ω · 600 W RMS

Fs 35 HzQts 0.76Vas 0.57 ft³Xmax 0.75″
The published specs don’t add up:

Recommended box

For a sedan, one sub, 600 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 volume1.13 ft³ (32 L)
Qtc0.93
Fc43 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 14 9/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)25 Hz
Portslot 2 3/8 × 14 5/16″, 44 9/16″ long
Port velocity at 600 W62 ft/s
F3 (−3 dB, no cabin gain)21 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 15/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.76
Qes0.89
Qms5.23
Vas0.57 ft³
Re (one coil)1.8 Ω
Sd76.1 in²
Xmax0.75″
Vd56.9 in³ calc.
Mms441 g calc.
BL14 T·m calc.
EBP39 — suits sealed calc.
Sensitivity, 1 W / 1 m80.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power600 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth ≈ 5 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth≈ 5 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 Kicx 12″ models