Focal K2 Power E25KX (DVC 4 ohm, predecessor of SUB 25 KXE)

10″ subwoofer · dual 4 Ω · 600 W RMS

Fs 38 HzQts 0.52Vas 0.71 ft³Xmax 0.89″

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 volume0.53 ft³ (15 L)
Qtc0.79
Fc58 Hz
F3 (−3 dB, no cabin gain)55 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 10 1/4″
Open sealed box in designer

Ported

Net volume1.62 ft³ (46 L)
Tuning (Fb)32 Hz
Portslot 1 15/16 × 14 5/16″, 40 15/16″ long
Port velocity at 600 W59 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs38 Hz
Qts0.52
Qes0.58
Qms5
Vas0.71 ft³
Re (one coil)3.2 Ω
Sd50.7 in²
Xmax0.89″
Vd44.9 in³ calc.
Mms133 g calc.
BL13.2 T·m calc.
EBP66 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.8 dB calc.

General

Size10″
Voice coilsdual 4 Ω
RMS power600 W

Mounting dimensions

Ø≈ 10 5/16″cutout ≈ Ø9 1/8″mounting depth ≈ 5 1/8″magnet Ø≈ 5 15/16″
Cutout diameter≈ 9 1/8″
Mounting depth≈ 5 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 Focal 10″ models