Hello, I have just set-up a new home cinema using a Yamaha DVD540 player and Yamaha 640se amp. I am impressed with DD and DTS playback, although dialogue can seem a little harsh / tinny - DTS is better than DD in that respect. I am concerned about music playback though. If I play a music CD on the DVD deck via optical link with the amp set to stereo - the quality is appalling. People sing with a lisp from the end of a hallway and bass is very distorted. It is better through my cheapo ancient cd player and crappy phono leads, although it does still sound very basy and speach sounds quite tinny. Any ideas on what may be the problem? Thanks.