Kicx ZT-12 (2+2)

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 31.6 HzQts 0.38Vas 1.00 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 volume0.64 ft³ (18 L)
Qtc0.60
Fc51 Hz
F3 (−3 dB, no cabin gain)64 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 5/16″
Open sealed box in designer

Ported

Net volume1.27 ft³ (36 L)
Tuning (Fb)31 Hz
Port2 round ports Ø2 1/2″, 20″ long
Port velocity at 500 W131 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)24 7/16″ × 15 3/4″ × 9 7/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.6 Hz
Qts0.38
Qes0.41
Qms4.51
Vas1.00 ft³
Re (one coil)2 Ω
Sd65.8 in²
Xmax≈ 0.39″
Mms228 g calc.
BL14.9 T·m calc.
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m85.4 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 3/16″cutout Ø11″mounting depth 6 7/8″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth6 7/8″

Cone area (Sd) calculated from Fs, Vas and Mms: 65.8 in².

Judging by its value, the published Re is for both coils in series — converted to per coil.

“≈” 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