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Just discovered the soundplane, looking forward to trying the DIY version. I have a question about the BOM. Specifically the dielectric:
12" by 12" by 1/16" thick Super-Resilient Silicone Foam Rubber
http://www.mcmaster.com/#8623k139
For that item at McMaster Carr there seems to be a firmness option of either firm or extra-firm. Which is the intended firmness for the soundplane?