I have just recieved a DVP-NS905 DVD player and have hooked it up to my STR-DB1080 Amp using an optical cable. The CD music playback is awful. Is there something I need to do to sort this? My 5 year old sony amp TA-F248E and CDP-XE520 CD player are miles better. In-fact my £30 proline CD player at work is about the same quality. I bought it mainly for DVD's - which it is brilliant at but the music is awful - I can only assume there are settings somewhere that I can play with to correct this. Any suggestions?