Acoustics - Reflection coefficient

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This is the opposite to the absorption coefficient. The reflection coefficient of a material indicates the ratio between reflected and received acoustic energy. So, when the coefficient is 1 it means that the received energy is equal to that which has been reflected, or in other words, that all received energy has been reflected. When on the other hand the coefficient is 0, it means that acoustic energy has been entirely absorbed.

The following table shows some typical reflection coefficients in relation to different types of materials (expressed in percentages: 1 equals 100%, 0.9 = 90% and so on)

Table 15.2. Typical values for reflection coefficients 

MaterialReflection coefficient
Smooth rock, plaster, polished wood95%
Painted wood90%
Rough wall80%
Plain brick wall75%
Curtains and carpets75%
Theatre wings30%
Wall tapestries25%
Fleece curtains20%


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