Out of curiosity, what makes watching non-movies with good sound less enjoyable?
Nothing wrong with having a preference - I'm just genuinely curious as it doesn't make sense to me and I've never heard of anyone preferring a lower-quality version of an experience for specific content. At...
You want all your media sources connected into the receiver's HDMI inputs, not the TV. There should only be 1 HDMI cable connected to the TV (I would use port 4 since it is the ARC port), and the 1st HDMI output of the receiver (it's ARC port).
You will then select a source with the receiver...