Kicx STQ-302 (2+2)

12″ subwoofer · dual 2 Ω · 400 W RMS

Fs 30 HzQts 1.07Vas 2.11 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 400 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 volume1.73 ft³ (49 L)
Qtc1.60
Fc45 Hz
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 3/4″
Open sealed box in designer

Ported

Net volume2.93 ft³ (83 L)
Tuning (Fb)37 Hz
Portslot 1 3/4 × 14 5/16″, 12 3/4″ long
Port velocity at 400 W62 ft/s
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 9/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30 Hz
Qts1.07
Qes1.31
Qms5.97
Vas2.11 ft³
Re (one coil)≈ 1.7 Ω
Sd≈ 76 in²
Xmax0.43″
EBP23 — suits sealed calc.
Sensitivity, 1 W / 1 m82.9 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power400 W

Mounting dimensions

Ø≈ 12 5/16″cutout ≈ Ø11 1/8″mounting depth 6 1/8″magnet Ø≈ 7 3/16″
Cutout diameter≈ 11 1/8″
Mounting depth6 1/8″

“≈” 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