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Sad to say, I haven't done a qualitative study to know for sure. It certainly seems that if so, it would possibly be a price break.You may also consider the foam insulation used in cold shipping. I used to work in the same building as a medical research company, and a good deal of my 4-inch foam is actually shipping insulation. It looks nearly identical to a flat version of the Auralex foam, and seems to have very similar sound deadening characteristics.
Rather than using egg cartons, I recommend using high-density closed-cell foam. While I'm not endorsing Auralex brand, that's the brand I've used to great effect. 4-inch foam, while more expensive, is best, as it reduces low-frequency reverb as well as high-frequency.
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