Thanks, I am going to do one final attempt at this before buying new subs. Ok, I know, Rockville, but. When I bought my amp(Rockville) there was a promo deal with amp(cea 1,000 watts) (2) 12 inch 600 rms subs and wiring kit with fuse etc. Think I paid $219. Subs were in box at start, but way box was cut for the subwoofer, the k6 had a odd piece that comes out and hit box, then I had hard time sealing(but those subs hit lows much better, xmax is 26mm). With a 3/4 trim ring, the odd piece will not hit box. So now I noticed my pioneers when I turn bass up, one sub is flexing and wanting to jump out of the box and I noticed a few screws holding sub loose, so still is not sealing good and can feel air leak. I bought a 3/4 inch mdf 12 inch trim ring, will put it on box, use it to have a good start at solid mounting points, then when I install subs will do a strip of butyl around entire sub. Just need to figure out what glue to use to mount ring, was thinking like the 3m marine sealant, there is one edge with slight slope giving me the main issues and no sturdy area to screw it down on one side.