Thank you sir so very much. This explains perfectly what I have to do to allow my guests to enjoy this fabulous set up Wiim has opened for me. I do in fact have Tidal & Amazon unlimited. Joined both of those only to make sure they would work losslessly Through my Wiim App - then jettison one of them after I see which works best for me. Most probably will Not have either of those services. However they most likely will have Spotify. For now of course they will not be able to Stream losslessly But this will give a good comparison of the differences in sound (if discernible by me - I used to be able to hear a difference) between my ALAC/FLAC vs AAC or whatever Spotify uses.
I have noticed you have posted a great deal of Helpful Information harkpabst - thank you again Sir. Sincerely Larry C