you know it's all good and fine to save a couple bucks on dynamat/raammat/etc., but did you hear him say about putting "a couple extra layers?" and him saying it was "about a dollar a square foot? so if you start adding it up, he's still paying 3 bucks a square, which is not really all that much cheaper than the stuff specifically designed for that purpose. i got all my stuff from raam audio, good product for a good price. i agree that dynamat is overpriced, you are probably paying for the name more than anything. but buying this product, thinking you are saving a fortune isn't exactly the truth either. anyway, just my 2 cents.