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<blockquote data-quote="Rudy" data-source="post: 7365050" data-attributes="member: 568035">I guess it is sort of beside the point since it won&#039;t solve your problem but constrained layer dampers work because vibrations in the substrate deform the adhesive. The adhesive is viscoelastic so it returns to its original position more slowly than it was deformed. Strains between the is.adhesive and constraining layer and the adhesive and substrate dissipate the vibration/movement as heat as the adhesive returns to stasis.You can&#039;t practically add enough mass to a panel to lower its resonant frequency out of the audible range - you need to quadruple mass for every octave. Constrained layer dampers may provide a small amount of stiffening, but not much. Stiffening raises resonant frequency so this and the added mass are mostly offsetting.In any case, you need to stiffen those panels. They are not only adding distortion by reinforcing the sub&#039;s output at their resonant frequencies, they are also stealing output.</blockquote>

[QUOTE="Rudy, post: 7365050, member: 568035"] I guess it is sort of beside the point since it won't solve your problem but constrained layer dampers work because vibrations in the substrate deform the adhesive. The adhesive is viscoelastic so it returns to its original position more slowly than it was deformed. Strains between the is. adhesive and constraining layer and the adhesive and substrate dissipate the vibration/movement as heat as the adhesive returns to stasis. You can't practically add enough mass to a panel to lower its resonant frequency out of the audible range - you need to quadruple mass for every octave. Constrained layer dampers may provide a small amount of stiffening, but not much. Stiffening raises resonant frequency so this and the added mass are mostly offsetting. In any case, you need to stiffen those panels. They are not only adding distortion by reinforcing the sub's output at their resonant frequencies, they are also stealing output. [/QUOTE]

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