Infinity Kappa 800W

8″ subwoofer · 2 Ω · 400 W RMS

Fs 34.5 HzQts 0.41Vas 0.45 ft³Xmax 0.37″

Recommended box

For a sedan, one sub, 400 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)
Qtc0.64
Fc54 Hz
F3 (−3 dB, no cabin gain)62 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.64 ft³ (18 L)
Tuning (Fb)41 Hz
Portround port Ø2 1/2″, 10 5/8″ long
Port velocity at 400 W195 ft/s
F3 (−3 dB, no cabin gain)36 Hz
Example box (outside)13 13/16″ × 15 3/4″ × 8 1/4″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs34.5 Hz
Qts0.41
Qes0.46
Qms4
Vas0.45 ft³
Re2.01 Ω
Sd33.5 in²
Xmax0.37″
Vd12.3 in³ calc.
Mms110 g calc.
BL10.2 T·m calc.
EBP75 — sealed or ported calc.
Sensitivity, 1 W / 1 m82.6 dB calc.

General

Size8″
Voice coils2 Ω
RMS power400 W

Mounting dimensions

Ø9″cutout Ø7 1/2″mounting depth 5 11/16″magnet Ø≈ 4 7/8″
Cutout diameter7 1/2″
Mounting depth5 11/16″
Overall diameter9″

“≈” 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