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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
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Showing 2 responses by geoffkait

geoffkait's avatar
geoffkait
23,365 posts
 
For a stubborn 60 Hz standing wave in my room I once built a 15 foot long folded S shape Helmholtz resonator using 6” diameter PVC PIPE, PIPE ELBOWS, END CAP, pipe fitting nozzle, PVC purple prep, PVC cement and a grapefruit size ball of hollow fiber wool inside for internal damping. Problem solved.
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geoffkait
23,365 posts
 
As fate would have it the standing waves associated with room corners do not (rpt not) always manifest precisely in the corners. That’s why it’s a good idea to map out the standing waves using a test tone and SPL meter. You may find in some cases the standing wave is located a foot or more from the actual corner. Placing the tube trap in the precise location of the standing wave makes all the difference. In addition to the corner locations, there usually are other places around the room where a tube trap is beneficial such as at the reflection point on side walls. 
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