I am not an audiophile. I purchased a Sony STR DE575 home theater system a few years ago and hooked up the system with the included little speakers and have enjoyed it since. HOWEVER... I recently purchased a Samsung 56" DLP TV and would like to upgrade the speakers. I have a new pair of JBL 20 speakers that I can use for my front L R speakers and am considering purchasing a JBL EC25 center channel speaker. I will leave the original small sony speakers for my rear surround sound right now. My question is this: First.... does this front JBL set up sound appropriate? second, will my current sony subwoofer still be good to use with this set up? and third, will the rear surround speakers be effective or do I need to upgrade them also? Thanks for any help. Harry