Hi all... I am considering Marantz CR603 for potential downsizing. When I look at their website, there is one "Aux in - Optical" on the rear panel. So I am wondering (1) what DAC chip is used in this unit (does it better than say, Marantz CD 6003 / 6004), and (2) I am curious whether this CR603 can be used as a DAC? (inputing digital audio signal from DVD via optical cable). I am currently using LG DVD player sourced to MF VDAC with a NAD amp (music only, never watch DVD). Too many boxes (and cables) in my apartment's living room...thats why downsizing probably will make my apartment and TV rack a bit tidier. many thanks.