II believe it is mainly a matter of availability of content in 7.1 vs 5.1. and also, Sonnie's room, although large, is a little crowded where a pair of rear speakers would go.Sonnie, this is awesome that you're getting set up for Atmos. I wonder why you chose to do 5.1.4 instead of 7.1.4. If I recall right, your room is plenty deep enough to accommodate surround back speakers, and I figured you already had them set up in your prior layout. Just curious. I bet that Martin Logan setup is going to sound awesome.
Nice to hear from you again :wave: