Hi Larry,
Thanks for moving this to the public forum.
Is that probably because of cancellation in corners? -point is should I still put traps in the front corners or put traps just where it is loud.
Both. If you have any untreated corners I'd aim there first.
Where you hear (or measure) the most bass depends on a lot of factors, especially which specific frequency. You didn't say if you used the weighted noise file from the RealTraps site or music. The problem with music is it contains only frequencies related to the key of the tune, and the frequencies keep changing with each note the bass player plays.
If I put traps on ceiling then I cant dampen ceiling for high ceiling effect like you also suggest.
In a room that size I generally advise against wood panel traps anyway. Four inch thick rigid fiberglass is perfect because it absorbs bass and also mids and highs.
I'd like to cover the plywood face of a couple of the soon to built traps w something like cloth or jute for diffusing. What can I use that won't dampen the 1/4 " panel??
Cloth is not a diffusor, but most cloth is not thick enough to have much affect on a wood panel trap. Again, if you haven't built those traps I'd rethink the strategy, and use rigid fiberglass type traps as explained in the Forum FAQ.
--Ethan
