I am at a loss as to me the sound from i) 800 to 861 via MHR and ii) ZP90 to HD621 to 861 via MHR sound very very similar...and, with the SONOS volume set to fixed it is an exact copy as the "DTS playback" test works...

And, fwiw, I am storing and retrieving all my music on a WD 4TB SharedSpace NAS with all music being ripped into AppleLossless using dBpoweramp...

Audio: Triad Monitor Golds, Surround Golds, Silver Subwoofers; Procella P-18 Subwoofer; QSC DCA 16622s, 1644, 3422, BASIS 922uz; ADA MACH IV B
Other: APC S-15s; Crestron
Sources and Video: Ran out of characters .....................