If you want to use ARC or eARC over long distance (>30'), find another way- HDMI isn't very reliable over long distance when used this way. If it carries audio well over that length, something else will need to suffer.
This comment came from someone at a major cable manufacturer after I asked about long distance HDMI cables that are powered by an AVR rather than using an externat power source-
"10 Meters is currently the longest consistent working distance for ARC/eARC (the issue is the copper wires in the AOC), HDBaseT extenders (some models) do rectify this by using active EQ, and ARC/eARC Only extenders are available (becoming more popular).
My only caveat with Bob's answer is that we (Xxxxxxxxxxxx tech team) are worried about non powered cables causing equipment damage, it is important to remember that current (amperage) is drawn not pushed and if the cable draws more than the display can provide there is a (small) possibility of damage, we cannot say that it will, but by the same token we cannot say that it won't.
So, take no chances."
Personally, I prefer to have all of the audio sources sending the signal to the AVR/AVP and let the TV be the TV. I don't like receiving trouble calls at all, never mind during dinner, at night, during a weekend or holiday. Been there for all of these, hated it every time.