Focal Flax Evo P 25 FE (SVC 4 ohm)

10″ subwoofer · 4 Ω · 300 W RMS

Fs 31 HzQts 0.46Vas 1.02 ft³Xmax 0.55″

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 volume0.49 ft³ (14 L)
Qtc0.80
Fc54 Hz
F3 (−3 dB, no cabin gain)51 Hz
Example box (outside)12 3/16″ × 12 3/16″ × 9 11/16″
Open sealed box in designer

Ported

Net volume1.62 ft³ (46 L)
Tuning (Fb)29 Hz
Portslot 1 9/16 × 14 5/16″, 40 1/4″ long
Port velocity at 300 W49 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.46
Qes0.51
Qms4.5
Vas1.02 ft³
Re3.7 Ω
Sd53.8 in²
Xmax0.55″
Vd29.6 in³ calc.
Mms155 g calc.
BL14.8 T·m calc.
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.3 dB calc.

General

Size10″
Voice coils4 Ω
RMS power300 W

Mounting dimensions

Ø10 1/4″cutout Ø9 3/16″mounting depth 5 9/16″magnet Ø5 11/16″
Cutout diameter9 3/16″
Mounting depth5 9/16″
Overall diameter10 1/4″
Magnet diameter5 11/16″

“≈” 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