The Oppo 205 manual states the quality of the digital output depends on the output connection. I did not know until I looked. Hope this helps with the discussions with Oppo players.
Due to bandwidth limitations , high resolution audio formats such as Dolby Digital Plus, Dolby TrueHD, DTS - HD High Resolution and DTS - HD Master Audio cannot be sent through the coaxial or optical digital audio output . A reduced resolution version of the same audio track will be output instead. To listen to high resolution audio formats in their best quality , please use the HDMI connection if you have a receiver that handles HDMI audio (see page 12 ) or use the multi -channel analog outputs if you do not (see page 15 ).
Due to copyright restrictions , SACD audio cannot be sent through the coaxial or optical digital audio output . To listen to SACDs , please use the HDMI or analog audio connections .
Due to copyright restrictions and bandwidth limitations , full resolution audio from DVD -Audio discs cannot be sent through the coaxial or optical digital audio output . To listen to DVDAudio in full resolution , please use the HDMI or analog audio connections .