Amazon HD Lower Price

The problem with Amazon HD is that streaming is throttled to a low resolution based on the traffic load (undefined by Amazon what does "heavy load" mean).

Furthermore, they seem ignorant of how Hi-Res streaming works.  According to their marketing, they will stream CD-quality up to 850 kbps?  As a matter of fact, 1411 kbps is the full CD-quality rate.  

Unfortunately, Amazon HD sounds terrible.

Need Roon to support Apple Music Hi-Res.

don't mix Amazon in with the other 2 you wrote about 

Well, I have Amazon HD and I'm able to stream 24bit/192kHz through Fire Cube to NAD M17V2. I can also stream Amazon HD through the BluOS, but I prefer the Fire Cube / Amazon Platform using the FireTv remote instead of an app, using the phone or computer. Also Amazon Music include lyrics on most songs. Both streamers will do 24bit/192kHz. Bluesound has a little more laid back sound, maybe a little bit cleaner, less noise, but not a big difference. I had Tidal Music service along with Amazon Music and I still preferred Amazon. I'm very happy with Amazon Ultra HD.