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.
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