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What is the maximum length of HDMI cable I can use when connecting my TV to my Sonos amp which powers my in ceiling speakers? Is 10 metre ok?

Perhaps see the suggestions mentioned in this link:

https://www.bluecinetech.co.uk/hdmi-max-length/


Make sure that the HDMI cable is rated for use as HDMI-ARC or HDMI-eARC. If the cable will be used only to supply audio to the SONOS ARC, the cable does not need to have super video quality capabilities.