Kicx PRO-300 (4+4)

12″ subwoofer · dual 4 Ω · 1,000 W RMS

Fs 27 HzQts 0.56Vas 1.55 ft³Xmax 0.64″

Recommended box

For a sedan, one sub, 1,000 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 volume1.45 ft³ (41 L)
Qtc0.80
Fc39 Hz
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 17 15/16″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)25 Hz
Portslot 2 3/4 × 14 5/16″, 52 7/16″ long
Port velocity at 1,000 W62 ft/s
F3 (−3 dB, no cabin gain)22 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 19 3/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs27 Hz
Qts0.56
Qes0.638
Qms4.41
Vas1.55 ft³
Re (one coil)≈ 3.4 Ω
Sd≈ 76 in²
Xmax0.64″
EBP42 — suits sealed calc.
Sensitivity, 1 W / 1 m83.3 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power1,000 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth 7 7/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth7 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