I've a LG C9 which supports HDMI 2.1, and my AVR-X1600H which supports eARC.
Does both devices need to be HDMI 2.1 to get's benefits like higher resolution capacity, or eARC (of course connected with proper Ultra Speed HDMI Cable)?
What if I have an PC connected to AVR by simple 2.0 HDMI cable, want to play an movie with lossless True HD Atmos track on it. It would be still lossless connected like that?
Is it even worth to upgrade a cable to get that lossless audio quality?