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https://www.sonos.com/en-gb/blog/hi-res-audio-guide It‘s UHD and shown with a logo, but limited to 24bit 48kHz. 24bit to 16bit is the important difference between Amazon HD and UHD. And not all Sonos Speakers support UHD, just the newer models.
https://www.sonos.com/en-gb/blog/hi-res-audio-guide It‘s UHD and shown with a logo, but limited to 24bit 48kHz. 24bit to 16bit is the important difference between Amazon HD and UHD. And not all Sonos Speakers support UHD, just the newer models.