American Bass GODZILLA-1822

18″ subwoofer · dual 2 Ω · 4,700 W RMS

Fs 30.3 HzQts 0.50Vas 2.47 ft³Xmax 0.89″

Recommended box

For a sedan, one sub, 4,700 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 volume2.37 ft³ (67 L)
Qtc0.72
Fc43 Hz
F3 (−3 dB, no cabin gain)45 Hz
Example box (outside)20 1/16″ × 20 1/16″ × 14 9/16″
Open sealed box in designer

Ported

Net volume5.16 ft³ (146 L)
Tuning (Fb)27 Hz
Portround port Ø5″, 10 5/16″ long
Port velocity at 4,700 W388 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 20 7/8″ × 17 15/16″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30.3 Hz
Qts0.50
Qes0.56
Qms4.99
Vas2.47 ft³
Re (one coil)2 Ω
Sd183.2 in²
Xmax0.89″
Vd162.3 in³ calc.
Mms781 g calc.
BL23 T·m calc.
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m87.4 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power4,700 W

Mounting dimensions

Ø≈ 17 15/16″cutout Ø16 3/4″mounting depth 12 1/8″magnet Ø≈ 10 7/8″
Cutout diameter16 3/4″
Mounting depth12 1/8″

“≈” 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 18″ models