I have a problem with a room mode. First I guess I should explain the room. The room is 15x20x8. The room is layed out as follows. I have a FP throwing to the 15 foot wall. Due to screen size I have to sit about 15 feet back which puts me 5 feet from rear wall. I have a 6.1 setup and a rear center surround mounted close to the top of ceiling. My room mode is about 3~4 feet wide and ~12 feet long centered in the room. This puts my listening position in the mode. Close to the rear wall the mode subsides some and the bass is much better. Would changing my seating position to the rear wall do more harm than good? My rear surround would be directly over my head. I have a BFD in my system but it doesn't help room modes any. I have moved the sub all over the front of the room and the mode always exists. *Short of room treatments which are not an option does anyone have any suggestions? *Would a second sub located in a different part of the room help with the mode or is always going to be there due to the size of the room?