Dayton Audio Ultimax II UMII18 Ported Wedge Enclosure, Single 18″

Dayton Audio Ultimax II UMII18 ported wedge enclosure, single 18-inch, with 2.72 cubic feet of net airspace tuned to 29.5 Hz through 28.2 square inches of port; the anechoic F3 is 36.3 Hz.

The port is tuned to 29.5 Hz. Expect a lift of several dB around that point relative to the same driver sealed, and run a subsonic filter 5 to 10 Hz below it; under tuning the port stops loading the cone.

28.2 square inches of port area keeps air velocity down at high output, so the port does not chuff when the music gets loud.

Wedge enclosures follow the seat-back angle and fire rearward into the trunk, which acts as an acoustic extension of the box.

Construction: 3/4-inch MDF with a double-layer 1.5-inch front baffle, the outer layer recessed so the driver sits flush, V-groove and dado joinery at the panel seams. Polyfill pre-installed and terminal cup fitted.

Check your driver's mounting depth against the 9-inch figure in the specifications. The published figures are for the dual 2 ohm versions of the driver. If you are between two drivers, send both model numbers and we will tell you which one this volume suits.

Questions on fit or matching? Call or text (775) 541-2950 with your vehicle and the gear you are running.

Specifications

• Enclosure type: Ported
• Drivers: Single, 18-inch
• Net volume: 2.72 cu ft
• Tuning: 29.5 Hz
• Port area: 28.2 sq in
• F3 (anechoic): 36.3 Hz
• Max driver mounting depth: 9 in
• Height: 10.12 in
• Width: 30 in
• Depth: 10.12 in
• Front baffle: Double layer, 1.5 in
• Fits: Dayton Audio Ultimax II UMII18