[Auzy]

The funny thing about 4K is that I do home AV installs, and its almost impossible not to have compatibility issues still.

To this day, I don't think we've had a single installation with 4K projector / Receiver / player working together of different brands without some kind of serious issue.

ARC is another disaster that we STILL are having trouble with, and thats been out for years. I really hope that more has been done in the way of standardisation to help iron out these issues

[Avernar]

I had to use an optical cable between my TV and AVR to get audio. The only thin ARC did was allow me to control the AVR volume control using thr TV's remote. Not very useful when no audio is coming back.