Re: Help with acoustic treatment in a small room...
Sorry, I think I figured it out.
This is his drum set inside the Lego table/sound absorbing panel frame. The piece by the bass drum is not visible, but it's two 2'x2' frames made with 1x4 strapping, with 2 layers of rock wool packed down to 4" thick. I covered it with felt and hinged it so it will fold nearly flat, but stands on its own when opened to 90 or 110 degrees. It makes a nice portable bass absorber.
I just checked the dollar to the pound, and I might actually have 125 pounds invested in those panels.