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Starting from theories for determining the reverberation time in non-diffuse sound fields, this paper firstly proposes a new formula to calculate the reverberation radius in rooms with non-uniformly distributed sound absorption. Nevertheless, the generally used formulas for the reverberation radius have been used in any circumstance. However, these theories are only valid in perfectly diffused sound fields thus, only when the energy density is constant throughout a room. The currently used formulas to calculate the reverberation radius have been derived by the classic theories of Sabine or Eyring. The reverberation radius is the distance from a sound source at which the direct sound level equals the reflected sound level.
This paper discusses the concept of the reverberation radius, also known as critical distance, in rooms with non-uniformly distributed sound absorption.
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