Focal Performance SUB P 30 DB (DVC 4 ohm)

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 29.4 HzQts 0.43Vas 2.00 ft³Xmax 0.35″

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 volume0.81 ft³ (23 L)
Qtc0.80
Fc55 Hz
F3 (−3 dB, no cabin gain)52 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 11 3/16″
Open sealed box in designer

Ported

Net volume2.61 ft³ (74 L)
Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 21 3/4″ long
Port velocity at 300 W63 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 13 7/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.4 Hz
Qts0.43
Qes0.46
Qms6
Vas2.00 ft³
Re (one coil)3.4 Ω
Sd79.2 in²
Xmax0.35″
Vd28 in³ calc.
Mms191 g calc.
BL16.1 T·m calc.
EBP64 — sealed or ported calc.
Sensitivity, 1 W / 1 m87 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 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″

Judging by its value, the published Re is for both coils in parallel — converted to per coil.

“≈” 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