How would you know if it is decompressing the HD stream or if it's just not taking the embedded compressed stream instead.

Like DTS-HD Master Audio is a combined lossless/lossy audio codec so that it is backwards compatible with systems that does not support the HD.. but if Xbox ONE just decoded internally how do you know if you are getting the lossless or the lossy stream?

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5