buy a sound level meter from radio shack, its worth the 20-50 bucks, youd be supprised what your missing. i bought one 2 weeks ago and adjusted according to the level meter. i found that my sub was drounding out 1/3 of the sound i should have been getting from and individual speaker. sound that should be phased between two speakers was directed from one. its worth it. I have a very good ear and the decible meter told me that i was off about 10 decibles, that makes a big difference in correctly adjusting individual speaker volume.