Focal K2 Power 27 KX (SVC 4 ohm)

11″ subwoofer · 4 Ω · 300 W RMS

Fs 48 HzQts 0.91Vas 0.53 ft³Xmax 0.35″

Recommended box

For a sedan, one sub, 300 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 volume1.06 ft³ (30 L)
Qtc1.11
Fc59 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)12 5/8″ × 12 5/8″ × 16 15/16″
Open sealed box in designer

Ported

Net volume1.87 ft³ (53 L)
Tuning (Fb)37 Hz
Portslot 1 9/16 × 14 5/16″, 19 5/8″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 10 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs48 Hz
Qts0.91
Qes0.97
Qms14.19
Vas0.53 ft³
Re4.6 Ω
Sd48.7 in²
Xmax0.35″
Vd17.3 in³ calc.
Mms103 g calc.
BL12.1 T·m calc.
EBP49 — suits sealed calc.
Sensitivity, 1 W / 1 m84.3 dB calc.

General

Size11″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø10 5/8″cutout ≈ Ø9 9/16″mounting depth 5 5/16″magnet Ø≈ 6 3/16″
Cutout diameter≈ 9 9/16″
Mounting depth5 5/16″
Overall diameter10 5/8″

“≈” 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 Focal 11″ models