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Originally Posted by Ydope  I think you make my point. A material's gas flow resistance has an influence on the performance of corner traps, but not the kind of influence the simulations would suggest. |
Aargh! The absorption characteristics of a porous absorber are defined by the surface impedance of the material and the location relative to the velocity component of the frequencies. Corner absorbers are used for two acoustic reasons: all modes build up in corners, and the effect of being in a corner is that the effective absorption at modal frequencies is four times greater than on a wall. The gas flow resistance is still the controlling factor. Not very significant at the ranges of materials that we consider for absorption, but the controling factor in why we choose those materials to begin with.
Andre