Before we moved in we did renovations on this house. I used to often walk around warming up on my violin in the open area where the stereo is now. It sounded fantastic. I first set up my stereo in my teaching studio, a small, nearly square room. It sounded horrible. I moved it to the open, common area and it sounds great with no treatments, just a rug and furniture. Luck of the draw, I suppose.
In a lot of these threads people say without the room being treated
It's a waste of money to upgrade you're system. The problem is I don't think most people know how to treat their rooms. I really think it takes a professional to know how to treat a room. Sure you can play around with it if you like but it could also be a big waste of time and money. And I know hiring a person to acoustically treat a room can't be cheap. I wonder why more people don't discuss this subject and make recommendations on who does this kind of work. When I look at the big picture this makes the most sense.