dangers of parallel walls

[colterphoto1]

quoting myself:" I wonder if I made them out of bent pegboard and filled them with loose
fibreglass if a combination diffusion/absorbtion might be effective?
Nearly all of the surfaces in the room are hard (it being a shop), so
some absorbtion might be good depending on the offending frequency.
Glass stuffed in a half round shape would have a variety of
thicknesses, therefore appealing to the 'broad spectrum' absorbtion
that so many go on about"

I'm getting some support for this idea, but to wait until measurements are made after all my stuff is in the room. Just yesterday I moved all the tools and gear from one end to another (backache) and noticed a shift in the flutter. Possibly just a few panels on critical areas in the shop might be enough to do the trick.