Kicx Z12 (2+2)

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 40.4 HzQts 0.58Vas 1.29 ft³

Recommended box

For a sedan, one sub, 500 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 volume1.38 ft³ (39 L)
Qtc0.80
Fc56 Hz
F3 (−3 dB, no cabin gain)53 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 17 3/16″
Open sealed box in designer

Ported

Net volume3.04 ft³ (86 L)
Tuning (Fb)34 Hz
Portslot 2 3/8 × 14 5/16″, 21″ long
Port velocity at 500 W64 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs40.4 Hz
Qts0.58
Qes0.637
Qms6.01
Vas1.29 ft³
Re (one coil)1.17 Ω
Sd78.2 in²
Xmax≈ 0.39″
Mms153 g calc.
BL8.4 T·m calc.
EBP63 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.8 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 1/8″cutout Ø10 15/16″mounting depth 5 3/4″magnet Ø≈ 7 1/8″
Cutout diameter10 15/16″
Mounting depth5 3/4″

Cone area (Sd) calculated from Fs, Vas and Mms: 78.2 in².

“≈” 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