Axiom Home Page Forums General Discussion Technical Questions My room's frequency response graph

If I remember correctly, a 250 Hz dip means you have two different paths from speaker to seating position which differ by a couple of feet. Could be something as simple as having the speakers a foot or so from a side or back wall, but more likely the difference between "direct from speaker to ear" and "from speaker to ear including a bounce off the side wall or" is a couple of feet.

If the former, move the speakers further away from the wall and the dip will move. If the latter, treat the first reflection points as others have suggested.