I realize this is probably an impossible question, but I am wondering what size speakers I would need if I ever get my wife to agree. Our family room is about 20 feet X 14 feet with a flat ceiling about 18 feet high. The room is enclosed by walls on three sides, but open to a foyer and staircase on one end. My TV and sound system are against one of the 20 feet walls, so I sit about 14 feet from where the speakers would be located. The foyer and staircase are off to the left of me.