I was thinking about early reflections as well. The room is 10 ft by 26 ft and it's open in the back. The sitting area is 11 ft from the TV and speakers. The 26 ft outer wall is primarily glass since it faces the back yard. The first 20 ft or so of the inside wall is brick since it was, at one time, the outer wall of the house.
There is a rug between the sitting area and TV. I could keep the blinds down on the windows as that should help tame them. For the brick wall, I could look into some acoustical treatments if I can find any my wife won't veto,
. That should help with early reflections.
What sort of new speakers? I have a pair of PSB imagine B bookshelf speakers. They sound awesome in a good room; they sound thin and not very accurate in this room.