| Re: Room treatment options
First off, because I know you have it, I'd read chapter 9 in the Master Handbook of Acoustics. Then I'd play test tones at those trouble frequencies and go around the room and see where they seem strongest. Mark those areas for treatment.
I think thick panels of OC703 attached to frames, wrapped in fabric and put in corners and edges is a good start and are easy to move around and experiment with.
I'd be worried about cylinders behind your maggies as they could mess up your rear wave. I have some leftover sonotube (a few feet of 16", not enough for a final project) if you want to experiment. It could be good for a helmholtz resonator test too.
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