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<blockquote data-quote="mvw2" data-source="post: 6297472" data-attributes="member: 574722">Anti-vibration: butyl/alum. foil mat - used to damp resonations in panels (metal/plastic).&nbsp; Typical requirements 25% coverage in the center of large, flat panels.&nbsp; More can be used but with diminishing returns.&nbsp; This material is not used to block sound, and although it will block some sound with high coverage and layers, it is not as effective as other options specifically geared for blocking sound.&nbsp; Sound Deadener Showdown tiles and Second Skin Damplifier Pro are your two best available products.Sound barrier: mass loaded vinyl or lead sheets - used to physically block sound waves, high density blocks and reflects away sound wave energy.&nbsp; Typical requirements are high coverage, minimal holes/open areas.&nbsp; Sound waves wrap around and take the path of least resistance.&nbsp; Sound will come in where it can, so higher coverage is better.&nbsp; Typically this barrier is separated from the surrounding surfaces by a decoupler, in most cases a foam.&nbsp; The foam allows the barrier to float and not transmit sound wave energy to adjacent objects.&nbsp; Second Skin offers their Luxury Liner products.&nbsp; Cascade offers a number of vinyl and lead barriers.&nbsp; Sound Deadener Showdown offers separate foam and mass loaded vinyl sheets.Sound absorber: open cell foam, cotton, wool, fiberglass batting - used to trap and absorb sound waves.&nbsp; It is the sound equivalent to a black hole.&nbsp; The function isn&#039;t to block outside noises but rather take care of inside ones, think room echo or boominess.&nbsp; Typical requirements are placement in key areas to reduce internal reflections/resonances.&nbsp; To be functional, these materials need to be quite thick, on the order of 2&quot; minimum to 6&quot;-8&quot; typical or greater.&nbsp; The high thickness is required to make the material functional for lower frequencies.&nbsp; A thin absorber will only absorb very high frequencies.&nbsp; The high thickness requirement makes it less useful for in-car applications and typically is never used or at least to any significant extent.&nbsp; Typical usage is in home like the fiberglass batting in walls for both insulation and sound absorption between rooms.&nbsp; Applications in-car will be very limited to locations that would actually allow significant thickness to be used.</blockquote>

[QUOTE="mvw2, post: 6297472, member: 574722"] Anti-vibration: butyl/alum. foil mat - used to damp resonations in panels (metal/plastic). Typical requirements 25% coverage in the center of large, flat panels. More can be used but with diminishing returns. This material is not used to block sound, and although it will block some sound with high coverage and layers, it is not as effective as other options specifically geared for blocking sound. Sound Deadener Showdown tiles and Second Skin Damplifier Pro are your two best available products. Sound barrier: mass loaded vinyl or lead sheets - used to physically block sound waves, high density blocks and reflects away sound wave energy. Typical requirements are high coverage, minimal holes/open areas. Sound waves wrap around and take the path of least resistance. Sound will come in where it can, so higher coverage is better. Typically this barrier is separated from the surrounding surfaces by a decoupler, in most cases a foam. The foam allows the barrier to float and not transmit sound wave energy to adjacent objects. Second Skin offers their Luxury Liner products. Cascade offers a number of vinyl and lead barriers. Sound Deadener Showdown offers separate foam and mass loaded vinyl sheets. Sound absorber: open cell foam, cotton, wool, fiberglass batting - used to trap and absorb sound waves. It is the sound equivalent to a black hole. The function isn't to block outside noises but rather take care of inside ones, think room echo or boominess. Typical requirements are placement in key areas to reduce internal reflections/resonances. To be functional, these materials need to be quite thick, on the order of 2" minimum to 6"-8" typical or greater. The high thickness is required to make the material functional for lower frequencies. A thin absorber will only absorb very high frequencies. The high thickness requirement makes it less useful for in-car applications and typically is never used or at least to any significant extent. Typical usage is in home like the fiberglass batting in walls for both insulation and sound absorption between rooms. Applications in-car will be very limited to locations that would actually allow significant thickness to be used. [/QUOTE]

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