M have DSP presets for Music-2Ch, Music-MCh, Cinema-2Ch and Cinema-MCh sources. Dependent on what the M processor "sees" from the incoming datastream, you get then the choice to selct one group.
Take a look in MCconfig under preset or similar and you will that.
In your case the stream on your optical input from your Mac is a Music-2CH stream therefore you have the choice for Music-2Ch presets like Trifield, Music, Stereo...
When playing a CD on the Oppo the stream is "seen" as a Movie-2Ch? source. That's as far as I remember, there was some posts about that-have no Oppo and HD621, sorry.
800v3/218/271/8k.2/5k5s
/5kC/DSP3200/Reviver/
TT-ELP/Graham Slee Revelation/Trinnov Altitude 32/OPPO 205
__Ayon/HB/Shunyata/Miltzow -- power cables,
__Ayon/Jungson/Miltzow --analog, Miltzow-- digital,
__Vortex/WMA ,
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