sound absorption coefficient

A monogram for finding the sound absorption coefficient in air.

Concrete and brick are examples of materials with low sound absorption coefficients at all frequencies.

Sound absorption coefficients of common materials used in buildings are presented in this table.

If the Weighted Sound Absorption Coefficient is less than 0.30 then the sample is deemed to be not classifiable.

If the material is required to absorb very low or high frequencies of sound, the individual sound absorption coefficients should be used for comparison, rather than the NRC value.

A sabine is the term used to express 100% sound absorption per square foot of surface. the amount of sabines is simply the sound absorption coefficient multiplied by each square foot of surface.

Dividing the number of metric sabins by the surface area of the sample in square meters provides the sound absorption coefficient of the material tested; the higher the coefficient, the more sound absorptive is the material.

The Weighted Sound Absorption Coefficient, calculated according to standard ISO/DIS 11654, is determined from the fitting of a reference curve of absorption to the octave band absorption coefficients.

In certain applications, such as designs of music rehearsal rooms, performance spaces, and rooms employed for critical speech, it is usually more appropriate to consider the sound absorption coefficients at the individual one-third octave band frequencies, including those above and below the bands used to compute NRC.