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<blockquote data-quote="Anthony Collova" data-source="post: 6256913" data-attributes="member: 558844">Well, the 25% coverage plan has gain mass popularity for sure but it is limited to specific goals.It is true, a high quality damping mat will require less total coverage than a lower quality mat, however the 25% plan is only good for reducing the harmonic, resonant frequency of the sheet metal, and considering that Speakers, subs, and other mechanically generated airborn noise stimulation are well out site the resonant frquency of the sheet metal more MIGHT be needed depending on the intensity of the energy being placed on the panel.To make a statement like 25% coverage is all anyone needs is very misleading, and really only addresses certain aspecs of vibration reduction.Consider how much vibration reduction and panel flex would be accomplish by covering 25% of the hood of a panel van that has 140 db pumping through it.Not much. The resonant frequency would certainly be reduced a great deal which would be great if thats all you were trying to do.Take more material unfortunately.now, on the floor? Hell 25% might be perfect.Load up on a havy vinyl or lead barrier and you are golden! (they key here though is to load up with 100% coverage)Remeber, this is a car audio board. We don&#039;t use vibration dapmers to simply reduce harmonics.ANT</blockquote>

[QUOTE="Anthony Collova, post: 6256913, member: 558844"] Well, the 25% coverage plan has gain mass popularity for sure but it is limited to specific goals. It is true, a high quality damping mat will require less total coverage than a lower quality mat, however the 25% plan is only good for reducing the harmonic, resonant frequency of the sheet metal, and considering that Speakers, subs, and other mechanically generated airborn noise stimulation are well out site the resonant frquency of the sheet metal more MIGHT be needed depending on the intensity of the energy being placed on the panel. To make a statement like 25% coverage is all anyone needs is very misleading, and really only addresses certain aspecs of vibration reduction. Consider how much vibration reduction and panel flex would be accomplish by covering 25% of the hood of a panel van that has 140 db pumping through it. Not much. The resonant frequency would certainly be reduced a great deal which would be great if thats all you were trying to do. Take more material unfortunately. now, on the floor? Hell 25% might be perfect. Load up on a havy vinyl or lead barrier and you are golden! (they key here though is to load up with 100% coverage) Remeber, this is a car audio board. We don't use vibration dapmers to simply reduce harmonics. ANT [/QUOTE]

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