Kicx Tornado Sound MD 12

12″ subwoofer · 4 Ω · 600 W RMS

Fs 51.2 HzQts 0.28Vas 1.78 ft³

Recommended box

For a sedan, one sub, 600 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 volume0.74 ft³ (21 L)
Qtc0.52
Fc94 Hz
F3 (−3 dB, no cabin gain)144 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 10 7/16″
Open sealed box in designer

Ported

Net volume1.59 ft³ (45 L)
Tuning (Fb)50 Hz
Port2 round ports Ø2 1/2″, 4 7/8″ long
Port velocity at 600 W209 ft/s
F3 (−3 dB, no cabin gain)103 Hz
Example box (outside)30 15/16″ × 15 3/4″ × 8 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs51.2 Hz
Qts0.28
Qes0.286
Qms18.45
Vas1.78 ft³
Re3.5 Ω
Sd82.3 in²
Xmax≈ 0.39″
Mms76 g calc.
BL17.4 T·m calc.
EBP179 — suits ported calc.
Sensitivity, 1 W / 1 m95.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power600 W

Mounting dimensions

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

“≈” 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