I’ve spent months trying to figure this out. Through trial and error, I confirmed that when pairing a Sonos sub with a Sonos One, or One SL, I can only stream Amazon music in HD, and not Ultra HD. A post from Dec 2021 confirms this as another user had the same issue with Play 5s. Pairing the Sub with my Arc is fine, and streams Ultra HD. Again from the other post, this is true for the Sonos Beam. I will be reaching out to Support. Looking forward to a fix. I bought a 2nd sub to pair with my speakers for the enhanced music experience. It would be great to stream to this setup in Ultra HD.
Answered
Unable to Stream Amazon Music Ultra HD when pairing Sub with Sonos One Products
Best answer by Mr. T
There is not going to be any fix.
HD is the maximum you will get outside a home theatre setup when using an older sub.
The support pages were eventually updated to state the following:
What bitrate and format does Amazon Music stream in?
Ultra HD audio playback is not supported on Connect:Amp, Play:1, Play:3, Playbase, Playbar, Sub (Gen 1), and Sub (Gen 2).
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