@JimmyG77 @xSteveuk That link does not mention anything about earc though. Enhanced Audio return channel allows users to transmit high quality audio. @JimmyG77 possibly you may need to reset the earc mode to Auto. see more here https://www.samsung.com/levant/support/tv-audio-video/what-is-earc-and-how-to-set-on-samsung-smart-t... The thing is though that some features are supported in this model, it does not have HDMI 2.1 inputs but still supports earc and users can pass uncompressed Dolby Atmos to via True HD over a single HDMI connection. However DTS is not supported and HDMI 2.0 will not provide the high bandwidth. An extensive review of the Tv here https://www.rtings.com/tv/reviews/samsung/au8000 see more on HDMI 2.1 via this link https://www.whathifi.com/advice/what-hdmi-21-everything-you-need-to-know
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 4.0,Android 12 Official Version.