WTFJ?
I also have something wrong with my hearing, and despite not being able to follow a conversation in a crowded bar, I can confirm that the regular streaming Amazon Prime Music through my Gateway Computer sounds like cats trying to claw their way up a blackboard. My mediocre antique Marrantz SR225 receiver and Klipsch Energy C-series (the old EMIs died ) speakers don't sound that bad with most sources (FM, CD player, cassette deck hooked up), but hooking up the sound from the standard rate Amazon Prime Music makes it sound even worse.I have Tidal, $19.99/mo for the Master quality account. I can clearly tell the difference between Hi Fi and Master and I have high frequency hearing loss. Focusrite Thunderbolt interface into JBL 802's.
Streaming audio and video are subject to fairly aggressive data compression. The dumbing down of sound quality. CD quality is much better, and even that is a compromise compared to full bandwidth audio. To me Tidal is worth the money, it's pretty much the same thing as Spotify, except better sound quality. Not likely there will be a video equivalent for a few years though.
How high is the Amazon HD res?
Amazon.com: Amazon Music Unlimited FAQs: Digital Music
Online shopping for Amazon Music Unlimited FAQs from a great selection at Digital Music Store.www.amazon.com