I just bought a Synergy system with F-3, S-3, C-3 and a subwoofer at Best Buy. They sounded pretty good in my opinion. However, I cannot duplicate the sound I heard at the demo. I have an Onkyo 602B powering the speakers. I also noticed that the sound is much better when receiving dolby 5.1 signals from HDTV broadcast. I have a JVC CD-player with a DAC but I am not satisfied when listening to the Brothers in Arms Album from Dire Straits. Sounded pretty good at the store. The receiver has 85w/c. Do i need a better amp?