Abstract
There is a growing concern with low-frequency noise in buildings. Sound power ratings for the sources involved, however, typically do not include any data below the 125-Hz octave band because the present series of ANSI standards (S1.30–S1.35) and their ISO counterparts for the determination of sound power, while not setting any low-frequency limits, do not provide any information on the measurement uncertainties for frequencies below the 125-Hz octave band. In reverberation room measurements, there are at least two types of low-frequency problems: (1) difficulties in obtaining a valid space average of the sound pressure and (2) effects of the acoustic impedance seen by the source on its sound power output. The published literature on the second type contains conflicting information. This issue is important not only for standardizing equipment sound power determinations, but also for the proper application of equipment sound power ratings.
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