have ewe dampened the 1st-wall reflections on the ceiling?
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Sedond's advice is good; you might also consider making the foam into small corner tunes-type triangles for the upper corners of the room. Be careful not to overdamp the room, however--trial and error is the best method here, but having reflective and diffusive surfaces in the right places is important too. I've heard a system in a well set-up room sound dull and almost lifeless because there were too many people in the room absorbing up the sound.