Does anyone have any experience with acoustical foam cubes as shown on this page?
http://www.foamforyou.com/foam_corner_kits.htm
See "foam cube blocks," about halfway down the page. I am thinking about buying a few of the 12" x 12" x 12" cubes. They seem easier to put up (Yep's instructions for mounting the DIY rigid fiberglass broadband absorbers left me scratching my head), and not a bad price. The webpage seems to provide some kind of data about absorption properties (NRC?) but I don't know what that means.