Abstract
Acoustical foams provide one of the easiest, most effective and economical ways to reduce the airborne noise from a mechanical device that is enclosed in a case or cabinet. As a lining for the case, the foam absorbs the sound waves by trapping them within its cells and converting the energy to very low-grade heat. E-A-R engineer Manuel Sánchez recently studied the absorption performance of acoustical foams manufactured by two different methods. Some of his findings are presented here.
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