Infinity Reference 860W

8″ subwoofer · 4 Ω · 250 W RMS

Fs 29.6 HzQts 0.45Vas 0.54 ft³Xmax 0.51″

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 volume0.32 ft³ (9 L)
Qtc0.73
Fc49 Hz
F3 (−3 dB, no cabin gain)49 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.81 ft³ (23 L)
Tuning (Fb)33 Hz
Portround port Ø2 1/2″, 13 1/4″ long
Port velocity at 250 W159 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)19 1/16″ × 15 3/4″ × 7 11/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs29.6 Hz
Qts0.45
Qes0.483
Qms6.1
Vas0.54 ft³
Re3.3 Ω
Sd33.2 in²
Xmax0.51″
Vd17 in³ calc.
Mms123 g calc.
BL12.5 T·m calc.
EBP61 — sealed or ported calc.
Sensitivity, 1 W / 1 m81.1 dB calc.

General

Size8″
Voice coils4 Ω
RMS power250 W

Mounting dimensions

Ø8 7/16″cutout Ø7 5/16″mounting depth 5 3/16″magnet Ø≈ 4 3/4″
Cutout diameter7 5/16″
Mounting depth5 3/16″
Overall diameter8 7/16″

“≈” 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 Infinity 8″ models