Hi,
Bass traps won't help. You have too little bass, not too much. There are no settings on the receiver that will fix this. You have to move the seating area--and sometimes a foot or so will make a huge difference. An old friend and former colleague, Dr. Floyd Toole, scientist and acoustician, once measured and graphed the bass response differences in the three different seats on a single couch, and the audible bass would vary as much as 10 to 15 dB or more. Such differences make the difference between hearing virtually no bass and hearing too much. (He called the room "the forgotten component" and it's so true.)
Play a recording with lots of good deep bass and walk around the room slowly noting the areas where the bass seems good but not overpowering --- that's the spot where you should move the couch. Don't feel victimized. Virtually every room has lots of areas of cancellation and reinforcement caused by standing waves and the particular dimensions of the room interacting with the speaker/sub locations and the seating area.
Good luck in finding the right location for the couch.
Alan
