I currently have a Belles 350a Reference amp, Belles 28A pre, Copland 822 cd player, and ATC scm35 speakers.Interconnects are Analysis Plus, Shunyata, speaker cable is Chord Odyssey 4. I would like to get a more musical sound in the system but don't know which piece or pieces should be changed . The pre or the speakers? Maybe an integrated amp with the ATCs? Help wanted.