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Here it is with the grill sitting on front. My plan was to install 4 threaded inserts, one in each corner and use nuts and bolts to attach it. But I like it without the grill so I left it. The grill was custom so it sits until I decide to trash it.

Should read "I am NOW using a Crown XLS-2502 for power"

Also, since the build, the plate amp failed. The plate amp is also no longer sold. Parts-Express accepted it for return but that left me with no amp and a big hole in the back, 2 holes actually. I made a wood plate to cover the entire back, painted it black and sealed the back up, cut a new...

Here are links to the things I used for this build. https://www.parts-express.com/dayton-audio-18-ultimax-subwoofer-with-spa1200dsp-amplifier-and-cabinet-package--300-7200 https://www.homedepot.com/p/FORMICA-4-ft-x-8-ft-Laminate-Sheet-in-Black-with-Matte-Finish-009091258408000/202911478...

So it's been a few days with my Dayton 18" UM18 in a 4 cu ft sealed enclosure. Power is from the Dayton plate amp, 1200 watt with DSP. The entire kit was $899 from Parts Express. First, everything arrived very well packed and went together really well. I used Titebond III glue for main assembly...

well, I built one. An 18" sealed kit with plate amp from Parts Express. Came out nice and sounds awesome. Only listened to music so far. Movies coming

Dual opposing 18" drivers is an option. I have room for almost a 2x2x2 ft box, 8 cubic feet. But I have room for one, no other places I can really add a second subwoofer.

I see lots of information about building them but really nothing solid as far as a review as to how they perform. I am thinking of building a subwoofer project during this downtime and looking at the Dayton UM 18 in a 4 cubic foot sealer enclosure. Possibly doing 2 of them in a slightly larger...