The Audio Return Channel (ARC) can really simplify your HT setup. It requires your AVR (amplifier/receiver) and TV to both have the ARC option. It sends the sound from your TV to your AVR with an HDMI cable. The really nice part is that when I turn on my TV, my amp comes on automatically. Whether I use TV or AVR volume control, they both change at the same time. It’s a nice feature. For smart TVs that have Youtube and Netflix embedded, it makes a lot of sense.
However, when it comes to Blu Ray players, Roku players, etc… you may want to keep using your AVR to do the switching instead of your TV. Why?
Much to my embarrassment, I discovered that I was not getting full True HD or DTS Master like I thought I was, and most certainly not Dolby Atmos or DTS:X when running through the ARC. Some TV’s may pass through the lossless formats, but many do not, including my own LG 65UF8500 3D 4k TV.
I also found that on some players, like my Sony BDP S6500, you need to make adjustments before your AVR will receive lossless formats. See the video for more on that. Moral of the story? Don’t put too much faith in “the system”, I never imagined this could even be a problem.