American Bass TM-822

8″ subwoofer · dual 2 Ω · 300 W RMS

Fs 45.7 HzQts 0.54Vas 0.33 ft³Xmax 0.24″

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 volume0.32 ft³ (9 L)
Qtc0.78
Fc65 Hz
F3 (−3 dB, no cabin gain)63 Hz
Example box (outside)10 5/8″ × 10 5/8″ × 8 5/8″
Open sealed box in designer

Ported

Net volume0.88 ft³ (25 L)
Tuning (Fb)36 Hz
Portround port Ø3″, 14 1/4″ long
Port velocity at 300 W135 ft/s
F3 (−3 dB, no cabin gain)32 Hz
Example box (outside)15 9/16″ × 15 3/4″ × 10 1/16″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45.7 Hz
Qts0.54
Qes0.602
Qms5.68
Vas0.33 ft³
Re (one coil)1.8 Ω
Sd33.1 in²
Xmax0.24″
Vd7.8 in³ calc.
Mms83 g calc.
BL8.4 T·m calc.
EBP76 — sealed or ported calc.
Sensitivity, 1 W / 1 m83.8 dB calc.

General

Size8″
Voice coilsdual 2 Ω
RMS power300 W

Mounting dimensions

Ø8 7/16″cutout Ø7 5/16″mounting depth 2 13/16″magnet Ø≈ 4 3/4″
Cutout diameter7 5/16″
Mounting depth2 13/16″
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 American Bass 8″ models