Hello all. My M-7s with the frozen woofers have been awaiting suitable replacements for some time. I know that the 6503 is the replacement offered at this time from Polk. I have managed to put off purchasing a new set and finally I found an orphan speaker with 2 6510s in it. I put them in and it sounds good. I never heard the 7s before. My questions are, is this a good recipe? Has anyone had experience with this swap? Would it be an upward move to try and find 6500s or the 6503s?