Dayton Audio UMII12-22

12″ subwoofer · dual 2 Ω · 800 W RMS

Fs 31 HzQts 0.56Vas 1.87 ft³Xmax 0.87″

Recommended box

For a sedan, one sub, 800 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 volume1.84 ft³ (52 L)
Qtc0.80
Fc44 Hz
F3 (−3 dB, no cabin gain)41 Hz
Example box (outside)14 9/16″ × 14 9/16″ × 20 13/16″
Open sealed box in designer

Ported

Net volume3.18 ft³ (90 L)
Tuning (Fb)30 Hz
Portslot 2 9/16 × 14 5/16″, 29 1/4″ long
Port velocity at 800 W64 ft/s
F3 (−3 dB, no cabin gain)26 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 17 5/8″
Open ported box in designer
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs31 Hz
Qts0.56
Qes0.71
Qms2.75
Vas1.87 ft³
Re (one coil)2.1 Ω
Sd81.8 in²
Xmax0.87″
Vd70.9 in³ calc.
Mms196 g calc.
BL10.6 T·m calc.
EBP44 — suits sealed calc.
Sensitivity, 1 W / 1 m85.5 dB calc.

General

Size12″
Voice coilsdual 2 Ω
RMS power800 W

Mounting dimensions

Ø12 5/8″cutout Ø11 1/4″mounting depth 7 1/16″magnet Ø≈ 7 5/16″
Cutout diameter11 1/4″
Mounting depth7 1/16″
Overall diameter12 5/8″

“≈” 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 Dayton Audio 12″ models