This paper examines fundamental statistical properties of the active and reactive sound intensity in reverberant enclosures driven with pure tones. The existing theory for sound intensity in a diffuse sound field, which is based on Waterhouse’s random wave model and therefore limited to the region of high modal overlap, is extended to the region of low modal overlap by taking account of the random fluctuations of the sound power emitted by the source that generates the sound field. The validity of the extended model is confirmed by experimental and numerical results.
Jacobsen, F., & Molares, A. R. (2011). Ensemble statistics of active and reactive sound intensity in reverberation rooms. Acoustical Society of America. Journal, 129(1), 211-218. https://doi.org/10.1121/1.3514425