Fi Audio OMEGA 18 D1

18″ subwoofer · dual 1 Ω

Fs 37.5 HzQts 0.28Vas 2.69 ft³Xmax 1.34″

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 volume2.49 ft³ (70.5 L)
Qtc0.40
Fc54 Hz
F3 (−3 dB, no cabin gain)115 Hz
Example box (outside)20 1/16″ × 20 1/16″ × 15 3/16″
Open sealed box in designer

Ported

Net volume3.60 ft³ (102 L)
Tuning (Fb)34 Hz
Portround port Ø5″, 8 15/16″ long
Port velocity at 300 W99 ft/s
F3 (−3 dB, no cabin gain)91 Hz
Example box (outside)27 1/2″ × 20 7/8″ × 15 3/16″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.5 Hz
Qts0.28
Qes0.29
Qms7.66
Vas2.69 ft³
Re (one coil)0.7 Ω
Sd187.6 in²
Xmax1.34″
Vd251.1 in³ calc.
Mms490 g calc.
BL16.7 T·m calc.
EBP129 — suits ported calc.
Sensitivity, 1 W / 1 m93.4 dB calc.

General

Size18″
Voice coilsdual 1 Ω
RMS power—

Mounting dimensions

Ø18 1/2″cutout Ø16 3/4″mounting depth 12 3/4″magnet Ø≈ 10 7/8″
Cutout diameter16 3/4″
Mounting depth12 3/4″
Overall diameter18 1/2″

“≈” 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 Fi Audio 18″ models