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Message: <blockquote data-quote="Rudy" data-source="post: 6712115" data-attributes="member: 568035"><p>Every time you double the mass of a barrier or the frequency of the sound you are blocking, you'll gain 6 dB - under ideal conditions. You can probably expect 3 dB in a car. The important thing is that you aren't starting at zero - the vehicle's sheet metal has mass and you are adding to what you start with. 1 lb/ft² does seem to be the sweet spot. 2 lb/ft² MLV is 1/4" thick and is pretty difficult to work with. It's always going to be a trade off between the mass you add and the results you get. Instead of using a lighter barrier, you'll probably get a better return on the weight you add by carefully targeting the areas you treat.</p></blockquote><p></p>

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