Question on BR HD Audio Playback (audiophile type question)

i have 2011 i7 amd mini.
current audio setup has following output options:
--hdmi tv (not high quality)
--optical (older rotel) receiver supports dts, dd, 2.0 pcm (not hd audio)
--24/96 usb out external dac

don't care multi-channel sound, high-quality 2ch playback (or 2.1 if matters).

***my question: of these highest quality sound output given setup above? based on ears, i'm thinking it's dts-ma lossless track plays fine. believe when select option mini going convert 24/96 stereo signal outputs via dac hifi setup.

have full disc rip of nirvana live @ paramount br (killer performance!)

in vlc, see following audio options - audio option / see in media info
2/0 - pcm s24 le (araw) stereo 24/48
vlc can play fine via audio output. guessing stereo pcm bitstream @ 24/48.

lossless - dts audio (dts) lossless 6ch 24/48
vlc can play fine via audio output. i'm guessing dts lossless, setup going down-mix stereo.

3/2+1 - dts audio (dts) 3/2+1 6ch 24/48
vlc can play fine via audio output. i'm guessing encoded dts setup going down-mix stereo.

3/2+1 - (undf) 3/2+1 6ch 24/48 6912kb/s
vlc errors on playback. i'm guessing dts bitstream pcm track?? can't play don't have dts / hd audio capable receiver.

 

hdmi can handle 24/192.

 

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