Posted by Wayne Parham [ 70.234.143.103 ] on March 16, 2006 at 16:51:40:

In Reply to: Re: Partitioning layer of insulation posted by Garland on March 16, 2006 at 12:56:01:

It's hard to say. In general, the thinner the layer, the less it does. Absorbent material is best spaced out 1/4λ from the boundary. So to get damping at a lower frequency, you need to make the absorbent material thicker or space it away. The lower you go, the thicker the padding would have to be. But if that requirement would result in having too much fill, spacing it out becomes a better option. If the crossover point is low or the box is small, it doesn't matter too much but if that isn't the case and standing waves can setup in the midrange, sometimes a partitioning layer or two is the best way to go.

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