I have the following kit Sony 725D DVD player Yamaha RX-V995 Receiver Celestion C series speakers Most thing sound very good but I find that some CDs sound wrong. Simple music with a few instruments sounds good, but complicated stuff with lots of instruments doesn't sound right, it sounds like the timing is all wrong. What do you think would benefit me the most, CD player, pre-amp or power amp ? I was think of trying a Rotel power amp to upgrade the main and maybe centre channels. Any ideas?