Insulation question

[bldozier]

Im looking 4 cleanliness, and ease of use, so wipe felt padding from the list?

[Ruediger]

Im looking 4 cleanliness, and ease of use, so wipe felt padding from the list?

For damping to work the soundwave must penetrate the damping material, and this requires the damping material to have "similar" acoustical properties as air. If the properties are very dissimilar, the sound wave will just get reflected (w/o absorbtion) at the boundary of air in the box and damping material.

You sure have seen pictures of anechoic chambers with lots of tetraeders on the walls made from foam. A soundwave approaching such a wall will see slowly varying acoustical properties and thus will not get reflected but propagate into the "foam wall" and will get absorbed.

Felt is much too dense.

As a rule of thumb the absorbing layer should have a thickness of 1/4 the wavelength of the sound waves to be damped, or more, if feasible.


Ruediger