I get used cd's from amazon & also use their cloud.
Lately I've been using Tidal's FLAC 1411 & may just stick with it.
I can do Tidal FLAC 1411 on a chrome browser on my laptop's internal WiFi (miracast) to my Samsung TV smarthub & optically attached sound system. Tidal will only let me do AAC 320 on the Samsung smarthub browser however. Which may be goodnuff, still testing!
Maybe Tidal can come out with a smarthub app like the others. Spotify, Pandora, MilkMusic...
Google Play Store also has a Tidal app that I use on my phone.
I need more than 2 channels.
DTS NEO 2:5, converts the format it receives to DTS (5.1).
If it gets stereo, it up converts.
If it gets DD 5.1, it "cross" converts.
If it gets DTS it passes it thru.
I like to "Blow out the Windows!" with stuff like Pitbull's mmm yeah or Don't Stop the Party!, Uptown Funk (Dave Aude Remix), & Van Halen