First identify your first reflection points on your right and left walls as viewed from your seated position, for my situation these and the corners about the middle of the wall were the worst. I made bass traps about 4ft tall for the same wall the speakers are on and have two acoustic ceiling tiles in back to try to defuse rather than dampen reflections to the rear. I also hung two ceiling clouds at the reflections points above... Still working to refine things but WOW IT SOUNDS GOOD!
