I have just added a Pioneer amp to my previuosly stereo setup, and I am loving surround sound from all sources! I have a Yamada DVD player primarily for Divx purposes but it also plays my dvds. Previously I used my Marantz CD6000 OSE into PM4000 for stereo, but adding the surround amp has left the Marantz amp redundant. So I am looking to sell all three and set up with a new cd and dvd player, most likely the Pioneer 575 (flavour of the year). I can only use the Pioneer through co-ax or opti inputs to my amp as it has no phono inputs only Scarts. I have been using the Marantz cd player through optical and I love the sound, different to analogue but not in a bad way. Am I likely to notice any difference using the Pioneer through an optical input, as surely this just sends the same data, and the decoding and amplification is done with the amp? I would like to make sure I don't stand to lose any audio quality before I go through with the upgrade.