I have followed the method outlined in the article above and it worked well for controlling bass resonance issues. Bass traps place in the corners behind my speakers actually resulted in less ambience eventhough the reflectors were aimed into the room. With the bass traps directly behind me, against the rear wall, brought life back to the room and solved resonant issues. ASC are expensive but they work.
Bass trapping - corners or walls?
I've been reading articles on the ASC website and it seems that they contradict themselves regarding placement of bass traps. Most of their placement articles discusses placing bass traps in the corners. But the article below actually says that traps in corners are not that important and that traps along the mid point of opposite walls are more beneficial. What gives?
http://www.tubetrap.com/bass_traps_articles/iar89.htm
http://www.tubetrap.com/bass_traps_articles/iar89.htm