| It is likely that the free hanging limb mass will have an unsuitably low resonance frequency and that my mounting it at both edges (with some tension) tunes the sheet into a usable frequency range. Something like tuning the strings on a string instrument.
More things to think about. Need to find a way of experimenting and measuring. Perhaps by hanging some weight from each sheet.
Perhaps a long, 8ft, sheet of bitumen isn't a bad idea. The topmost part, tensioned by the weight of the material below will have a higher resonance frequency while the lower portion will tune lower in the spectrum. Question is what the range will be.
Would it be a reasonable measurement to hang 3 to 5 sheets, each 8ft long at a distance of 1" from the wall and measure with REW before and after each sheet is mounted? |