Hi all and sorry for the long post!
I am honestly at a loss right now. I have a Samsung Q90R TV, which does now officially support HDMI 2.1 and eARC, and a Sonos Arc sound bar. While I can get normal ARC working and hear sound perfectly, this obviously creates latency issues and there is a slight lip sync issue which drives me nuts!
So as far as I’m aware, I need an HDMI 2.1 certified cable for eARC to work. No problem, I tested my setup with the HDMI cable that came with the Sonos Arc (which is HDMI 2.1) and then suddenly eARC turns on and all is well!
However, the problem is that I need a cable that is 15 meters (50 feet) long and also supports HDMI 2.1. So I research and find that to get those sort of speeds at that length you need a fiber HDMI cable. So I bought one from KabelDirekt, that is certified and has the legit HDMI 2.1 certification sticker, meaning that in theory it should work perfectly.
However, to my dismay, when I try and use it I can only get traditional ARC and eARC refuses to work! Moving my entire setup around, to try the shorter cable that came with the system again, eARC is instantly recognized and works without a hitch!
So am I missing something? Has anyone had any luck with fiber cables and eARC on a Samsung TV (or any TV really)? I read that an HDMI voltage Inserter might be needed for Active Fiber cables, would this potentially help?
Thank you so so much in advanced for any advice!
EDIT: I am using an Apple TV and games console as external devices, so eARC is definitely something I need to get working.