I bought one of these for my Rel to limit an vibrations going through the floor in my loft. It appears to be made from 12mm MDF, carpet, dense foam and accoustic foam. I wanted to do something similar with my main stereo speakers, so made two 'Grammas' using some MDF I had. I bought some cheap carpet from Carpet Right for £2.49 a square meter (£10 for a 4 x 1 meter length). I found some very similar packing foam which is almost as dense and is similar to that found in tool cases - you cut it to shape for the tools etc. I also found some thick corrugated 'egg crate' style foam that looks similar, but probably has different properties. Try http://www.iplacoustics.co.uk fopr some 'profiled accoustic foam' which will probably do the job. I'm not sure where to get the thick dense foam strips from (4" x 2" on the Gramma, 3" x 2" on mine), but I'm sure a web search will find something similar. here's a link to the pics in another thread: http://www.avforums.com/forums/showthread.php?s=&threadid=127788&perpage=15&pagenumber=2 Gary.