Sound Absorbers

Absorbers are used to reduce noise reflection to dissipate noise energy. They have common physical properties - they arez: porous, fibrous and sometimes covered with protective membranes. Noise enters the absorber and is partly dissipated (absorbed) within the material. Some is transmitted. Some is reflected. Absorber performance is expressed as a decimal value. A perfect absorber is rated at 1.00. The higher the decimal value the more effective the absorber will be. Effectiveness is expressed as NRC (Noise Reduction Coefficient) .NRC: Percentage of acoustical energy absorbed calculated as an average of laboratory test data at several frequencies