I think also that 800 V3 has 2 audio chips to 598's 1 enabling it " to provide upsampling and resolution enhancement for all sources including CD and DVD video " according to their Version 3 DVD Audio update page, whereas 598 will decode but not upsample.861 or 568 V2 will then carry out further processing/upsampling.

P.S. 800/861 have both just received rave reviews in UK based HiFi Choice magazine current edition.

Regards,
Manus

Mostly harmless. Comfortably numb.