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Sound Deadening
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<blockquote data-quote="Rudy" data-source="post: 4373995" data-attributes="member: 568035"><p>You are sort of mixing up some basic concepts. Sound deadening is a very broad term and all sorts of products can fit under that umbrella. That make it almost meaningless.</p><p></p><p>The product group most often called sound deadeners are the vibration dampers. Second Skin Damplifier, Dynamat Xtreme, Cascade V-Max, Hushmat and RAAMmat all fall into this category. As a side note, Hushmat is decent stuff, at least the black version that I've seen is. My only complaint is that the foil is a little thin and it has a rather thick layer of black paint on it that adds little value that I can see. Cascade V-Max is also black, but it has a nice 4 mil foil that is anodized black - big difference.</p><p></p><p>You'll want to pick one of these to treat large, mostly flat panels to eliminate resonance. After that, you really need to define your goals. If reducing noise, you will almost certainly want to use something like the mass loaded vinyl barrier you linked. This is intended to block sounds like engine, tire and exhaust noise. You need to completely shield the the car from the noise. Picture the heat shield on the space shuttle.</p><p></p><p>The choice of open cell vs closed cell foam in this and other applications is largely determined by the conditions the material will encounter in use. Closed cell is less effected by moisture and generally chemical exposure so should be chosen anywhere exposure to harsh conditions may occur. The foam in intended to create a cushion of air to lift the heavy barrier from the substrate and OCF will theoretically do a better job of that. The vehicle floor may be an exception to this because of pressure from feet, packages, etc. CCF is less likely to compress. While it may not work as well under ideal conditions, it may well be superior in actual use.</p><p></p><p>In places where you don't need a barrier, it is often useful to layer thin sheets of CCF over the vibration damed parts of the vehicle. This does very little on its own to block sound, but can reduce reflections and fill voids through which noise/sound can travel. OCF would be more effective here too, but because of the harsh environment, CCF is a safer choice.</p></blockquote><p></p>
[QUOTE="Rudy, post: 4373995, member: 568035"] You are sort of mixing up some basic concepts. Sound deadening is a very broad term and all sorts of products can fit under that umbrella. That make it almost meaningless. The product group most often called sound deadeners are the vibration dampers. Second Skin Damplifier, Dynamat Xtreme, Cascade V-Max, Hushmat and RAAMmat all fall into this category. As a side note, Hushmat is decent stuff, at least the black version that I've seen is. My only complaint is that the foil is a little thin and it has a rather thick layer of black paint on it that adds little value that I can see. Cascade V-Max is also black, but it has a nice 4 mil foil that is anodized black - big difference. You'll want to pick one of these to treat large, mostly flat panels to eliminate resonance. After that, you really need to define your goals. If reducing noise, you will almost certainly want to use something like the mass loaded vinyl barrier you linked. This is intended to block sounds like engine, tire and exhaust noise. You need to completely shield the the car from the noise. Picture the heat shield on the space shuttle. The choice of open cell vs closed cell foam in this and other applications is largely determined by the conditions the material will encounter in use. Closed cell is less effected by moisture and generally chemical exposure so should be chosen anywhere exposure to harsh conditions may occur. The foam in intended to create a cushion of air to lift the heavy barrier from the substrate and OCF will theoretically do a better job of that. The vehicle floor may be an exception to this because of pressure from feet, packages, etc. CCF is less likely to compress. While it may not work as well under ideal conditions, it may well be superior in actual use. In places where you don't need a barrier, it is often useful to layer thin sheets of CCF over the vibration damed parts of the vehicle. This does very little on its own to block sound, but can reduce reflections and fill voids through which noise/sound can travel. OCF would be more effective here too, but because of the harsh environment, CCF is a safer choice. [/QUOTE]
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