Hi,
Definitely a room issue, you seem to be sitting in a null area. Not much can be done except moving your couch and/or speakers. Sometimes a few feet can make all the difference.
You need room treatment bad.
Unfortunately I just don't have many options for moving anything around thou I will continue to ponder that to be sure. I'm wondering if building small bass traps (since I don't have room for large ones) in the corners would do much for the M80's. While I know it would benefit the sub(s) I haven't found the bass to be too lacking for them.
