American Bass GF-1822

18″ subwoofer · dual 2 Ω · 3,000 W RMS

Fs 30.7 HzQts 0.54Vas 3.24 ft³Xmax 1.18″

Recommended box

For a sedan, one sub, 3,000 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 volume2.68 ft³ (76 L)
Qtc0.80
Fc46 Hz
F3 (−3 dB, no cabin gain)43 Hz
Example box (outside)19 11/16″ × 19 11/16″ × 16 3/4″
Open sealed box in designer

Ported

Net volume6.82 ft³ (193 L)
Tuning (Fb)27 Hz
Portslot 5 1/2 × 19 1/16″, 48 1/16″ long
Port velocity at 3,000 W65 ft/s
F3 (−3 dB, no cabin gain)24 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 32 7/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs30.7 Hz
Qts0.54
Qes0.609
Qms4.7
Vas3.24 ft³
Re (one coil)≈ 1.7 Ω
Sd175.9 in²
Xmax1.18″
Vd207.8 in³ calc.
Mms534 g calc.
BL17 T·m calc.
EBP50 — sealed or ported calc.
Sensitivity, 1 W / 1 m88.4 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power3,000 W

Mounting dimensions

Ø≈ 17 11/16″cutout Ø16 9/16″mounting depth 11 1/4″magnet Ø≈ 10 3/4″
Cutout diameter16 9/16″
Mounting depth11 1/4″

Cone area (Sd) calculated from Fs, Vas and Mms: 175.9 in².

“≈” 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