Has anyone been experimenting with different material mediums for baffle-less speakers (using exciters)? Does there seem to be a maximum size that can be used before the functionality falls apart? Has anyone tried a 4x8 foot sheet of ....anything, that seems to work? The 2'x2' square of 1" thick, (pink) hard insulation has shown amazing results for me. The clarity, due to the speed, and increased broadcasting surface.....seem to free up the various waves.