ANSI/ASA S12.58-2012

This American National Standard describes a method for the determination of sound power levels ofnoise sources that emit broadband sound and/or discrete frequency sounds/tones using reverberationrooms. The standard applies when it is either undesirable or unfeasible to move the source to decreasethe uncertainty of the measurement. The method described requires reverberation room pre-qualificationthrough test and requires the use of the comparison method to determine sound power levels. Thisstandard specifies the physical environment, procedures, and equipment used to qualify the reverberationroom by test. Pre-qualifying the room ensures adequate modal density for the use of one source locationto obtain acceptable accuracy and repeatability of results. The reference sound source (RSS) used forthe comparison method relies on AHRI Standard 250 to accurately describe the requirements for andcharacterize sound power of the RSS at all frequencies of interest.