Dayton Audio UM18-22

18″ subwoofer · dual 2 Ω · 1,000 W RMS

Fs 26.2 HzQts 0.70Vas 5.12 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 1,000 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 volume4.31 ft³ (122 L)
Qtc1.04
Fc39 Hz
F3 (−3 dB, no cabin gain)31 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 15 1/4″
Open sealed box in designer

Ported

Net volume7.31 ft³ (207 L)
Tuning (Fb)29 Hz
Portslot 3 1/8 × 19 1/16″, 19 11/16″ long
Port velocity at 1,000 W62 ft/s
F3 (−3 dB, no cabin gain)25 Hz
Example box (outside)31 1/2″ × 20 1/2″ × 26 3/4″
Open ported box in designer
203040506080100150200667278849096HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs26.2 Hz
Qts0.70
Qes0.85
Qms4.05
Vas5.12 ft³
Re (one coil)2.15 Ω
Sd188.9 in²
Xmax0.87″
Vd163.7 in³ calc.
Mms536 g calc.
BL14.9 T·m calc.
EBP31 — suits sealed calc.
Sensitivity, 1 W / 1 m86.9 dB calc.

General

Size18″
Voice coilsdual 2 Ω
RMS power1,000 W

Mounting dimensions

Ø≈ 17 11/16″cutout ≈ Ø16 9/16″mounting depth ≈ 8 1/4″magnet Ø≈ 10 3/4″
Cutout diameter≈ 16 9/16″
Mounting depth≈ 8 1/4″

“≈” 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 Dayton Audio 18″ models