Level measurements do not necessarily correlate well with subjective loudness. Several methods have been described for making objective measurements that are designed to correlate better with actual loudness. Some of these measures are: A-weighting and B-weighting, the methods of Stevens and Zwicker as described in ISO 532A and B, and the method described by Moore and Glasberg. All of these measures are intended to describe (measure) the loudness of sounds with constant spectra. How well do these measures work with typical audio signals distributed via broadcast or recording?
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