Kicx Tornado Sound 12 (2+2)

12″ subwoofer · dual 2 Ω · 2,000 W RMS

Fs 35 HzQts 0.47Vas 2.15 ft³
The published specs don’t add up:

Recommended box

For a sedan, one sub, 2,000 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 volume1.17 ft³ (33 L)
Qtc0.80
Fc59 Hz
F3 (−3 dB, no cabin gain)56 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 14 15/16″
Open sealed box in designer

Ported

Net volume2.72 ft³ (77 L)
Tuning (Fb)36 Hz
Portslot 4 5/16 × 14 5/16″, 40 9/16″ long
Port velocity at 2,000 W63 ft/s
F3 (−3 dB, no cabin gain)33 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 19 1/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.47
Qes0.518
Qms5.51
Vas2.15 ft³
Re (one coil)1.9 Ω
Sd69.8 in²
Xmax≈ 0.39″
Mms97 g calc.
BL8.9 T·m calc.
EBP68 — sealed or ported calc.
Sensitivity, 1 W / 1 m89 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power2,000 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth 8 1/4″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth8 1/4″

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