Focal Expert P 30 F (Flax, SVC 4 ohm)

12″ subwoofer · 4 Ω · 400 W RMS

Fs 28 HzQts 0.47Vas 2.47 ft³Xmax 0.55″

Recommended box

For a sedan, one sub, 400 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 volume1.27 ft³ (36 L)
Qtc0.80
Fc48 Hz
F3 (−3 dB, no cabin gain)46 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 16 1/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)29 Hz
Portslot 1 15/16 × 14 5/16″, 24 13/16″ long
Port velocity at 400 W60 ft/s
F3 (−3 dB, no cabin gain)27 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 16 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs28 Hz
Qts0.47
Qes0.51
Qms5.6
Vas2.47 ft³
Re3.7 Ω
Sd79.1 in²
Xmax0.55″
Vd43.6 in³ calc.
Mms170 g calc.
BL14.7 T·m calc.
EBP55 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.8 dB calc.

General

Size12″
Voice coils4 Ω
RMS power400 W

Mounting dimensions

Ø12 3/8″cutout ≈ Ø11 3/16″mounting depth 6 5/16″magnet Ø≈ 7 1/4″
Cutout diameter≈ 11 3/16″
Mounting depth6 5/16″
Overall diameter12 3/8″

“≈” 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 12″ models