My neighbors thought the same thing. So they had me rip ALL their cd's all 723 I think it was into 320 after getting polk lsi25's and a new onkyo receiver they could hear the difference even more than they did with the sony receiver and the klipsch bellas they had. So I had to redo all of them in uncompressed. If you start ripping do it once in uncompressed.
Here is a link to some pictures:
[Karma] Ripping CD's - Club Polk