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I was wondering if anyone here has tried any of the sound dampening products offered by www.selectproducts.com? if so, are any of them effective, and which ones? from reading about them, some of them are priced below the average of sound dampening mats available, and some are very pricey. Are any of these similar to dynamat, raamat, etc? i don't care about color, odor, etc. so long as it provides efficient, and cost effective sound dampening qualities. thanks