We don't seem to have any dedicated thread on room acoustic treatments so creating one here.
Room size in question is 12'X15'. HT is PC based. projector screen is 8' wide. Boston Acoustics A26 speakers are used as front left, right and center channels. Speakers have rear port. Both side speakers are put on desk with gap of around 15" from rear wall and around 25" from side walls.
Problem is center speaker. Its installed on front wall, above the projector screen without any gap between speaker and wall. no other option except this location. Gap between speaker and roof is also barely 2"-3". Seating position is also close to rear wall and can't make any drastic change in that either except a gap of around 12" between wall and sofa.
All this results into obvious annoying boom in the range around 200 hz (not measured). Tried closing the port of the center speaker but that also did not help, rather sound feels more restrained.
What are the options in above situation? Can any acoustical treatment help here? Any kind of panel can be put behind the speaker to reduce the boominess?
Heard about wedge shaped sound proofing foam panels which are not that expensive, are they really any effective in such situation? Any other treatment which can be looked at?