find the bad spots in your room

use this bass tone (wave sweeping from 40Hz to 300Hz) to hear the bad spots in your room. it will sound like the volume goes up but it's actually the bass waves building up. if you use logic you should put eq on it and see how the eq graph "walks" from left to right. so as soon as you hear the bass waves clash in your room - getting louder - check where the eq graph is peaking - that's where your problem eq is.

http://www.hometracked.com/2008/01/25/quick-home-studio-monitor-tests/