Abstract
Annex D of ANSI S12.51 (ISO 3741) addresses the issue of qualifying reverberation rooms for determining sound power of fixed sources that emit sound at discrete frequencies. At low frequencies reverberation rooms have reduced modal density which causes a highly varying (spatially) sound field, resulting in a less accurate measure of the space-average sound pressure level in the reverberant field of the room compared to higher frequency bands. Annex D sets limits on the maximum allowable standard deviation in the 1/3-octave bands from 100 Hz to 2,500 Hz, and Annex E provides limits for 50 Hz, 63 Hz, and 80 Hz. This presentation discusses the required test procedure and presents examples of real room qualification test results and how rooms can be modified to meet this requirement. One fairly unique example will also be shown where the room fails to meet the qualification limits, when in fact it truly should. A recommended modification to the data analysis process is suggest to resolve this unique problem.
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