A few thoughts from the bleachers, taking notes from pro audio acoustic treatments with acoustic foam...
It's all about maximizing surface area. Spacing foam off the wall effectively (sort of) gives you double the surface area for absorption. Make those log pyramids deeper. Heck, use some pyramid logs as a spacer underneath the first layer; hole punch a few spots so pressure makes it to the backside.
botton of cup --> dynamat etc (optional) --> short logs --> foam layer --> tall logs --> cotton or whatever else on top
cool idea! Although, we'd probably want to try to strip off most of the adhesive on the foam.. or find a different type of acoustic foam entirely.
or perhaps we could use some felt on top of the pyramids on top of the acoustic foam.
Edited by chrislangley4253 - 11/18/12 at 10:33pm