Focal Flax Evo P 20 FSE (shallow, SVC 4 ohm)

8″ subwoofer · 4 Ω · 200 W RMS

Fs 35 HzQts 1.32Vas 0.32 ft³Xmax 0.43″

Recommended box

For a sedan, one sub, 200 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 volume0.64 ft³ (18 L)
Qtc1.62
Fc43 Hz
F3 (−3 dB, no cabin gain)30 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 15 1/16″
Open sealed box in designer

Ported

Net volume1.27 ft³ (36 L)
Tuning (Fb)30 Hz
Port2 round ports Ø2 1/2″, 21 7/16″ long
Port velocity at 200 W76 ft/s
F3 (−3 dB, no cabin gain)23 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 7 5/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs35 Hz
Qts1.32
Qes1.8
Qms5
Vas0.32 ft³
Re3.2 Ω
Sd33 in²
Xmax0.43″
Vd14.3 in³ calc.
Mms148 g calc.
BL7.6 T·m calc.
EBP19 — suits sealed calc.
Sensitivity, 1 W / 1 m75.3 dB calc.

General

Size8″
Voice coils4 Ω
RMS power200 W

Mounting dimensions

Ø8 7/16″cutout Ø7 3/8″mounting depth 3″magnet Ø≈ 4 13/16″
Cutout diameter7 3/8″
Mounting depth3″
Overall diameter8 7/16″

“≈” 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 8″ models