I've put many hours into trying to install the Polk MM6501s. I finally got something that I was really happy with, until i did a test run of the speakers. They sound like they are farting instead of solid bass. they aren't bottoming out, I tried sealing the enclosure and held them as tighly against the frame with no improvement. I'm not sure if I have defective speakers or what to do. After putting all this time into it and finding the fit to be insane, I'm deflated. I'm not sure what to do next.

-R