Amazon HD has a wider music selection but poorer sound quality. The bitrate stream of 44.1/16 files is markedly lower than Tidal's and if you read the fine print (always read the fine print) Amazon HD may "choke" the streaming quality to 320kbps depending on the bandwidth availability (very arbitrary and vague statement). That is probably what you heard. However, not saying Tidal has no problems, the stream often sounds too bright/ harsh and never got anything out of MQA except degradation of sound in a sense of loss of naturalness.I just switched from Amazon HD and am trying out Qobuz and Tidal. Both sound a bit better than Amazon HD - they sound sharper - Amazon HD sounded smoothed off to these untrained ears - I used it for about 7 months constantly - noticed a sharp difference when trying out Qobuz and Tidal. I recognize that sound differences can be all made up in your head but hey that's been my experience. Interestingy Amazon HD offers tons more stuff in 24/96 and 24/192 than either Qobuz or I believe Tidal
To my ears, Qobuz sounds more natural/ smooth, some of the times and it is also cheaper than Tidal.
Anyway pick your own poison
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