Kicx Sound Civilization QD 12.2 (4+4, 2 Ohm)

12″ subwoofer · dual 4 Ω · 350 W RMS

Fs 28 HzQts 0.53Vas 1.48 ft³Xmax 0.20″

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 volume1.13 ft³ (32 L)
Qtc0.80
Fc43 Hz
F3 (−3 dB, no cabin gain)40 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 6 3/8″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)25 Hz
Portslot 1 3/4 × 14 5/16″, 31 3/16″ long
Port velocity at 350 W61 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.53
Qes0.58
Qms5.8
Vas1.48 ft³
Re (one coil)3.95 Ω
Sd79.1 in²
Xmax0.20″
Vd15.6 in³ calc.
Mms283 g calc.
BL18.4 T·m calc.
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m84 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power350 W

Mounting dimensions

Ø12 5/8″cutout Ø11″mounting depth 3 3/16″magnet Ø6 1/8″
Cutout diameter11″
Mounting depth3 3/16″
Overall diameter12 5/8″
Magnet diameter6 1/8″

“≈” 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