First let me say I am new to this forum and a novice and this a great forum with very knowable members. My 5.1 surround sound setup is at least 15-20 years old and would really appreciate peoples opinions on changes/upgrades and recommendations that would give me a better home theatre sound. The room the system is in is a 15x15 living room. My main concern would be on speakers since I have recently bought a new receiver and blu-ray player. I seem to get decent sound from them but would like to know if i could do anything to improve it. My system consist of a Sony STR-DH540 (725/ 145x5) Sony BDP-S5100 blu-ray, speakers consist of two front and two rear Optimus Pro LX5 bookshelf speakers 8ohms 50w(rms)-100w max. center: RCA 40-5011- 100 rms 200 max, subwoofer: Yamaha- YST-SW80 100w. Last year I finally had to replace the foam rings on the bookshelf speakers all but one turned out fine after the repair, but one sounds a little raspy don't know why cause the repair looks fine. So I either need to replace with one of the same or other that is comparable. The center has never really sounded like I'm getting enough, and the sub tends to strain from time to time. Don't really want to spend a lot, under $400 would be ideal. I am leaning towards replacing the whole system with the Energy 5.1 Take Classic Home Theater System $349 only because there are a lot of good reviews on amazon or would it be worth just replacing a few and still get great sound. Also how would I go about figuring out what the problem is with the one bookshelf? Your opinions and advice and recommendations would be greatly appreciated.