I've never had any streaming app before Amazon HD, so I have no baseline for comparison. Already being an Amazon Unlimited Music subscriber, when they announced their HD music service and the free three month trial, it was no-brainer to me. I never listened to their service before, since it was such low bit rate audio. So, I had no experience with any of these streaming services.
After using Amazon HD for these four months, my observation is that it's just so dang convenient that I'm hooked! I can find almost any of my CDs, SACDs, or vinyl. The sound is good enough on their HD content, and the Ultra HD is great. I do wish they allowed exclusive mode, however. I find myself going into my laptop's sound settings and finding my DAC and setting Windows to play at whatever resolution each track is, which is quite the hassle. And the other problem is that sometimes the streaming quality will drop from high quality to their Standard level.
Now, I did receive a CD for Christmas, Mahler: Symphony 5, which I had been wanting. However, I looked it up in Amazon Music HD and they offer it in Ultra HD, which turned out to play at 24/192. I checked in Discogs, and, sure enough, one of the versions shown there is comprised of 24/192 data files.
So, I went ahead and listened to it. OMG, this is just incredible music. The sound is so smooth and pure, just fantastic. I can't see any CD sounding this good. So, I just returned the CD yesterday. Amazon also has high resolution files of one of my other favorite classical pieces, which is Gustav Holst's The Planets with Zubin Mehta and the Los Angeles Philharmonic on Decca. Again, just fantastic sounding. So, as I guess you can gather, I am quite happy with the service, overall.
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