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After doing a bit more indepth research and looking at sound absorption coefficients for materials, Ive decided to get a 100sqft 3 mil roll of fibrous carpet underlay (they call it jute in the above link for civicforums). It's supposed to be good at absorbing high and mid range frequencies. As for the low frequencies...thats what the Resisto is for. I plan on using about 4 layers of this stuff (its pretty thin) and replacing the foam underlay which I currently have on my floors. Maybe stuff some of it in the dash if I have leftovers. I hope this works.
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