Focal SUB 12 SLIM (shallow, SVC 4 ohm)

12″ subwoofer · 4 Ω · 280 W RMS

Fs 24 HzQts 0.69Vas 2.19 ft³

Recommended box

For a sedan, one sub, 280 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 volume1.66 ft³ (47 L)
Qtc1.05
Fc37 Hz
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume2.83 ft³ (80 L)
Tuning (Fb)28 Hz
Portslot 1 9/16 × 14 5/16″, 23 5/16″ long
Port velocity at 280 W55 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 13/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs24 Hz
Qts0.69
Qes0.764
Qms6.88
Vas2.19 ft³
Re3.2 Ω
Sd73 in²
Xmax≈ 0.39″
Mms223 g calc.
BL11.9 T·m calc.
EBP31 — suits sealed calc.
Sensitivity, 1 W / 1 m82.5 dB calc.

General

Size12″
Voice coils4 Ω
RMS power280 W

Mounting dimensions

Ø12 3/4″cutout Ø11 1/16″mounting depth 3 3/8″magnet Ø≈ 7 3/16″
Cutout diameter11 1/16″
Mounting depth3 3/8″
Overall diameter12 3/4″

“≈” 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