The clanking, would be the relays turning on and off individual channels. Not every receiver does this, but many do. It wasn't noticed so much before, because TVs were connected by stereo RCA jacks which always had two channels. But now with S/PDIF or HDMI the channel count is known and can vary from program to program. These changes causes the receiver to reconfigure itself. It is perfectly normal, even if it is distracting.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris