See above. My receiver is a Sony STR-DG910. It supports 7.1 PCM at 24bits and 192Khz, which I like, but doesn't have 4K and HDR passthrough, nor does it have ARC (it came out in 2007 or so). Right now, with my Sony KDL-32XBR6, the receiver acts as the hub and only the HDMI out is connected to...