Here's a question: When you watch a movie on iTunes or Vudu with Atmos, but you don't have an Atmos AVR, what happens to the Atmos tracks? Are they downmixed into everything, or are the rear surrounds carrying those tracks?
Case in point: I watched Annihilation on iTunes after I installed the new HDMI splitter (see above post). My Harman Kardon 2600 reported Multi-channel PCM 3/4.1, in other words, 7.1. I have a 7.1 setup, but had to wonder if the rears were playing what should have been overhead.
Movies in Atmos no longer have channel numbers listed, they just say Atmos. I know it's a different animal with object-oriented whatever, but there ARE still channels there. I'll have to see if any of my Atmos movies play in less than 7.1.
What gets me wondering is that the current crop of seven channel AVRs that have Atmos can be configured as 7.1 or 5.1.2.
Either way, it sounded great--that movie has killer sound design. I wish there was an easy way to mute channels to hear what they're playing rather than just disconnecting them. I'd like to hear what's coming from the rear surrounds. It's hard to tell, because usually, when they're active, all hell is breaking loose in the movie.