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<blockquote data-quote="FoxPro5" data-source="post: 4596212" data-attributes="member: 562649">Figure 5sqft per area of the door. If you have speakers in the door, then that&#039;s one layer on the outer door skin, one on the driver mounting surface and one on the door trim card.Total for front doors is about 30 sqft. If speakers in back; 60 sqft total.I wouldn&#039;t expect too much satisfaction of road noise attenuation from any deadening mat. 2 lbs/sqft of mass on your door skins will probably result in about 12-14 dB transmission loss at 125 hz. To get to 2 lbs/sqft you&#039;d need about 4.5 layers of DP. If you figure the cost per sqft to do this, it&#039;s not as cost effective as other materials that are more effective for the task at hand (ie blocking noise).Furthermore, transmission loss can be boosted significantly with a spring-mass system that&#039;s decoupled from the surface. Deadening mat is coupled to the surface. It&#039;s essentially the wrong tool for the job. Pardon the tech-talk mumbo jumbo but it&#039;s the truth. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</blockquote>

[QUOTE="FoxPro5, post: 4596212, member: 562649"] Figure 5sqft per area of the door. If you have speakers in the door, then that's one layer on the outer door skin, one on the driver mounting surface and one on the door trim card. Total for front doors is about 30 sqft. If speakers in back; 60 sqft total. I wouldn't expect too much satisfaction of road noise attenuation from any deadening mat. 2 lbs/sqft of mass on your door skins will probably result in about 12-14 dB transmission loss at 125 hz. To get to 2 lbs/sqft you'd need about 4.5 layers of DP. If you figure the cost per sqft to do this, it's not as cost effective as other materials that are more effective for the task at hand (ie blocking noise). Furthermore, transmission loss can be boosted significantly with a spring-mass system that's [I]decoupled [/I]from the surface. Deadening mat is [I]coupled [/I]to the surface. It's essentially the wrong tool for the job. Pardon the tech-talk mumbo jumbo but it's the truth. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]

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