I have just set up a Uniti Star using the AV Bypass Analogue input - but I have exactly the same issues as described here - hiss from that channel only, irregardless of whether the AV amp is on
https://forums.naimaudio.com/topic.php?oid=77878162325247625&coid=159503632588890
This didn’t seem to get resolved then - anyone else have this issue???