Kicx ZM-12 (2+2)

12″ subwoofer · dual 2 Ω · 350 W RMS

Fs 35.7 HzQts 0.41Vas 0.91 ft³

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 volume0.67 ft³ (19 L)
Qtc0.64
Fc55 Hz
F3 (−3 dB, no cabin gain)64 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.38 ft³ (39 L)
Tuning (Fb)33 Hz
Portslot 1 9/16 × 14 5/16″, 36 5/16″ long
Port velocity at 350 W53 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35.7 Hz
Qts0.41
Qes0.45
Qms5.26
Vas0.91 ft³
Re (one coil)2 Ω
Sd72.6 in²
Xmax≈ 0.39″
Mms239 g calc.
BL15.4 T·m calc.
EBP79 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power350 W

Mounting dimensions

Ø≈ 12 3/16″cutout Ø11″mounting depth 6 5/16″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth6 5/16″

Cone area (Sd) calculated from Fs, Vas and Mms: 72.7 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