Focal Performance Sub P 30 (SVC 4 ohm)

12″ subwoofer · 4 Ω · 250 W RMS

Fs 31.3 HzQts 0.51Vas 2.26 ft³Xmax 0.21″

Recommended box

For a sedan, one sub, 250 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 volume1.52 ft³ (43 L)
Qtc0.80
Fc49 Hz
F3 (−3 dB, no cabin gain)47 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 18 11/16″
Open sealed box in designer

Ported

Net volume3.07 ft³ (87 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 15 1/4″ long
Port velocity at 250 W62 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 15 3/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31.3 Hz
Qts0.51
Qes0.55
Qms6.59
Vas2.26 ft³
Re3.6 Ω
Sd79.2 in²
Xmax0.21″
Vd16.5 in³ calc.
Mms150 g calc.
BL13.9 T·m calc.
EBP57 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø12 3/8″cutout ≈ Ø11 3/16″mounting depth 5 13/16″magnet Ø≈ 7 1/4″
Cutout diameter≈ 11 3/16″
Mounting depth5 13/16″
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