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Tim, across the ditch here we have Pyrotek's Wavebar and Acoustica's Mass Loaded Organic Barrier and probably Acoustop as well. They are all "floppy", at least as far as the lighter sheets go. Voetmann may also have tried MLV and found that rubber sheet was more efficient - perhaps I will email to ask him. However, one could go on trying stuff forever - certainly MLV (and MLO) is cheaper here than natural rubber sheet and your success with it and documentation of your builds is great for all the DIYers.
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