Noise Reduction Coefficient

Arithmetic mean of sound absorption coefficients at 250, 500, 1000, and 2000 Hz, rounded to the nearest 0.05 metric sabin per square metre.

This gives a measure for rating the overall sound absorption performance of a material when used in an enclosed architectural space, where sound is being reflected at many angles of incidence.

See also: Absorption Coefficient.

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Subjects: Noise & Vibration