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<blockquote data-quote="FoxPro5" data-source="post: 4374994" data-attributes="member: 562649">Keep going with your STC research, then if your goal is to block road noise.In one of the links you posted above, they claimed the material was &quot;extremely lightweight&quot; and was a &quot;excellent sound deadener.&quot; If we know that &quot;deadening sound&quot; in this instance is mass-dependent, you don&#039;t have to be a rocket scientist to know how much BS their selling.MLV by itself does have a nice STC, but it&#039;s not going to function as well until it&#039;s mechanically isolated from the surface. The air spring created by the decoupler is critical for transmission loss performance, so much so that you can expect an additional 18dB loss above the resonant frequency in question with a decoupled barrier vs plain old MLV alone.LL has that decoupler, however the foam is weak and is easily compressed. It will also take on water due to it&#039;s open cell nature. That leaves only a few places in your car where it will optimally perform, the firewall being one of them (as long as you don&#039;t crush it or get it wet.)Deadening mats that are purposely coupled to a resonant surface are weak barriers...no matter how many layers you use....due to what I just outlined above.The last thing anyone needs to understand is that sound deadening and&nbsp; sound blocking is frequency-dependent. Most people that sell these products would love for you to believe in fairy tales - most notably the ability of their products to work EVERYWHERE and do EVERYTHING. This is an outright lie.</blockquote>

[QUOTE="FoxPro5, post: 4374994, member: 562649"] Keep going with your STC research, then if your goal is to block road noise. In one of the links you posted above, they claimed the material was "extremely lightweight" and was a "excellent sound deadener." If we know that "deadening sound" in this instance is mass-dependent, you don't have to be a rocket scientist to know how much BS their selling. MLV by itself does have a nice STC, but it's not going to function as well until it's mechanically isolated from the surface. The air spring created by the decoupler is critical for transmission loss performance, so much so that you can expect an additional 18dB loss above the resonant frequency in question with a decoupled barrier vs plain old MLV alone. LL has that decoupler, however the foam is weak and is easily compressed. It will also take on water due to it's open cell nature. That leaves only a few places in your car where it will optimally perform, the firewall being one of them (as long as you don't crush it or get it wet.) Deadening mats that are purposely coupled to a resonant surface are weak barriers...no matter how many layers you use....due to what I just outlined above. The last thing anyone needs to understand is that sound deadening and sound blocking is frequency-dependent. Most people that sell these products would love for you to believe in fairy tales - most notably the ability of their products to work EVERYWHERE and do EVERYTHING. This is an outright lie. [/QUOTE]

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