I need some sound deadening. If I touch the walls anywhere in the room it feels like I'm touching a speaker cone.
The couch is intentional. I looked at HT seats but I felt uncomfortable. If I wanted the real theatre experience at home, I would spill some orange pop and popcorn on the floor and get 2 people to sit in front of me and talk all the way through a movie.
An old friend of mine says the way to get a good sound room is to hire 2 carpenters who have never built anything before and give them all the beer and weed they want. That way the room will have no parallel surfaces.