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<blockquote data-quote="keep_hope_alive" data-source="post: 7366020" data-attributes="member: 576029">no one has actually told you how sound deadening material should work.&nbsp; //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifsimply adding mass is not the goal.&nbsp; that is all asphalt based products do.&nbsp; adding mass is an inefficient way to lower resonance.&nbsp; might as well just start using concrete.viscoelastic and elastomeric are the terms to read up on.&nbsp; that is what true deadening does - it&#039;s called damping.&nbsp; you want to add damping to the panels.&nbsp; damping will absorb vibration and convert it to low level heat.&nbsp; damping is how you lower resonance.a vehicle treated with asphalt products (simply adding mass) and a vehicle treated with the same amount of damping products will sound completely different.&nbsp; the damped vehicle will outperform the mass-added vehicle in every measurable way.<a href="http://www.greengluecompany.com/effectsOfDamping.php" target="_blank">Effects of Damping | Noise Damping – Green Glue Company</a>The Technical Library tab is a great place for info.&nbsp; Green Glue is a true damping product.<a href="http://www.quietrock.com/educational-resources/quietglue-versus-green-glue.html" target="_blank">How QuietGlue Pro Outperforms Green Glue At A Lower Cost</a>Quiet Glue by Serious Energy (formerly Serious Materials) is also a true damping product.</blockquote>

[QUOTE="keep_hope_alive, post: 7366020, member: 576029"] no one has actually told you how sound deadening material should work. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] simply adding mass is not the goal. that is all asphalt based products do. adding mass is an inefficient way to lower resonance. might as well just start using concrete. viscoelastic and elastomeric are the terms to read up on. that is what true deadening does - it's called damping. you want to add damping to the panels. damping will absorb vibration and convert it to low level heat. damping is how you lower resonance. a vehicle treated with asphalt products (simply adding mass) and a vehicle treated with the same amount of damping products will sound completely different. the damped vehicle will outperform the mass-added vehicle in every measurable way. [URL="http://www.greengluecompany.com/effectsOfDamping.php"]Effects of Damping | Noise Damping – Green Glue Company[/URL] The Technical Library tab is a great place for info. Green Glue is a true damping product. [URL="http://www.quietrock.com/educational-resources/quietglue-versus-green-glue.html"]How QuietGlue Pro Outperforms Green Glue At A Lower Cost[/URL] Quiet Glue by Serious Energy (formerly Serious Materials) is also a true damping product. [/QUOTE]

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