CHAPTER 12
Absorption
The law of conservation of energy states that energy can neither be created nor destroyed. However, energy can be changed from one form to another. If there is excessive sound energy in a room, the energy itself cannot be eliminated, but it can be transformed into an innocuous form. This is the function of sound-absorbing materials. Generally, sound absorbers can be considered as belonging to one of these types: porous absorbers, panel absorbers, and volume or resonance absorbers. Generally, porous absorbers are most effective at higher frequencies, whereas panel and volume absorbers are most effective at lower frequencies. ...
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