Kicx GT 12M (2+2)

12″ subwoofer · dual 2 Ω · 500 W RMS

Fs 39.5 HzQts 0.49Vas 1.31 ft³
The published specs don’t add up:

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 volume0.81 ft³ (23 L)
Qtc0.80
Fc64 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 3/16″
Open sealed box in designer

Ported

Net volume2.58 ft³ (73 L)
Tuning (Fb)34 Hz
Portslot 2 3/16 × 14 5/16″, 23 1/4″ long
Port velocity at 500 W65 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs39.5 Hz
Qts0.49
Qes0.53
Qms6.95
Vas1.31 ft³
Re (one coil)1.8 Ω
Sd79.1 in²
Xmax≈ 0.39″
Mms162 g calc.
BL11.7 T·m calc.
EBP75 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.3 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power500 W

Mounting dimensions

Ø≈ 12 3/16″cutout Ø11″mounting depth 5 1/2″magnet Ø≈ 7 3/16″
Cutout diameter11″
Mounting depth5 1/2″

“≈” 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