Dweller,
It has hdmi 2.0a, hdcp 2.2 and does 11.2, 4 channel atmos. I'm getting for the arc. It does have 7 channel amp, but you can add your own amps to get 11.2. Everyone seems to rave about the arc and how easy it is to use. I've heard dirac is better, but a lot more $$$ and from what I read you need to have some degree of experience to setup. Arc is pretty easy to use. I am getting the mrx 720 for 2250.00 at dealer. My setup will only allow for front, center, rear and 4 atmos. Can't do sides do to room configuration. This should be a great upgrade compared to my lexicon dc-1, being over 20 yrs old. I will only use I'll internal amps for atmos, still need to purchase them. Not sure what I will get.