Focal Auditor RSB-300 (DVC 4+4 ohm)

12″ subwoofer · dual 4 Ω · 300 W RMS

Fs 25 HzQts 0.47Vas 3.28 ft³

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 volume1.66 ft³ (47 L)
Qtc0.80
Fc43 Hz
F3 (−3 dB, no cabin gain)41 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)30 Hz
Portslot 1 9/16 × 14 5/16″, 19 13/16″ long
Port velocity at 300 W59 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 14 9/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs25 Hz
Qts0.47
Qes0.52
Qms4.5
Vas3.28 ft³
Re (one coil)3.2 Ω
Sd73 in²
Xmax≈ 0.39″
Mms137 g calc.
BL11.5 T·m calc.
EBP48 — suits sealed calc.
Sensitivity, 1 W / 1 m86.5 dB calc.

General

Size12″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø12 11/16″cutout ≈ Ø11 7/16″mounting depth 5 9/16″magnet Ø≈ 7 7/16″
Cutout diameter≈ 11 7/16″
Mounting depth5 9/16″
Overall diameter12 11/16″

“≈” 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 12″ models