I've set up my Pioneer VSX 1021-k with 2x Polk RTI A8 floor speakers, and Polk Blackstone TL2600 speakers (4 satellite, 1 center, 1 sub) and listened to music (via Ipod), movies and tv. My main issue so far is the quality of the sound, or rather the type of sound I'm getting. Everything seems to come out of the two floor speakers and although these sound great there is still something missing (mid range or highs??) and it doesn't really surround you when you're listening. I'm not sure what is wrong but I just don't have the same level of clarity I did even with my old Theater in a box setup. I tried adjusting the treble/bass and it doesn't really make much of an impact either. So now I'm thinking it's because I need rear speakers to match or exceed the floor speakers? I know someone had recommended ditching the blackstones and going with a large center...but I still think I'm going to have lopsided sound with everything coming from the front. If I do upgrade the speakers what would the ideal sizes be and how many? (ie, two rear towers and 2 bookshelf side speakers with a large center?). Or could it be I just need a more powerful receiver?