Focal K2 Power SUB 25 KXS (shallow, SVC 4 ohm)

10″ subwoofer · 4 Ω · 350 W RMS

Fs 35 HzQts 0.81Vas 0.64 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 350 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)
Qtc1.01
Fc44 Hz
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 6 3/8″
Open sealed box in designer

Ported

Net volume1.98 ft³ (56 L)
Tuning (Fb)29 Hz
Portslot 1 9/16 × 14 5/16″, 32 3/8″ long
Port velocity at 350 W59 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts0.81
Qes0.97
Qms5
Vas0.64 ft³
Re3.2 Ω
Sd50.7 in²
Xmax0.55″
Vd27.9 in³ calc.
Mms174 g calc.
BL11.2 T·m calc.
EBP36 — suits sealed calc.
Sensitivity, 1 W / 1 m81 dB calc.

General

Size10″
Voice coils4 Ω
RMS power350 W

Mounting dimensions

Ø10 9/16″cutout Ø9 1/4″mounting depth 3 3/4″magnet Ø≈ 6″
Cutout diameter9 1/4″
Mounting depth3 3/4″
Overall diameter10 9/16″

“≈” 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 10″ models