Focal Auditor RSB-250 (DVC 4+4 ohm)

10″ subwoofer · dual 4 Ω · 250 W RMS

Fs 29 HzQts 0.59Vas 1.48 ft³

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 volume1.09 ft³ (31 L)
Qtc0.91
Fc45 Hz
F3 (−3 dB, no cabin gain)38 Hz
Example box (outside)12 5/8″ × 12 5/8″ × 17 7/16″
Open sealed box in designer

Ported

Net volume1.84 ft³ (52 L)
Tuning (Fb)32 Hz
Portslot 1 9/16 × 14 5/16″, 28 3/16″ long
Port velocity at 250 W44 ft/s
F3 (−3 dB, no cabin gain)28 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 11 1/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29 Hz
Qts0.59
Qes0.68
Qms4.7
Vas1.48 ft³
Re (one coil)3.2 Ω
Sd47.6 in²
Xmax≈ 0.39″
Mms96 g calc.
BL9.1 T·m calc.
EBP43 — suits sealed calc.
Sensitivity, 1 W / 1 m83.8 dB calc.

General

Size10″
Voice coilsdual 4 Ω
RMS power250 W

Mounting dimensions

Ø10 11/16″cutout ≈ Ø9 5/8″mounting depth 4 5/8″magnet Ø≈ 6 1/4″
Cutout diameter≈ 9 5/8″
Mounting depth4 5/8″
Overall diameter10 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 10″ models