Abstract
This paper deals with the assessment of the factors involved in sound-attenuation characteristics of ear muffs. To this end, the most common methods (subjective, objective on people, and objective on a test fixture), under free and pseudo-diffuse field conditions have been used. The relative importance of these factors in the different measuring methods, their variation with frequency, and the influence of field conditions and the type of head (human or artificial) are studied. Empirical equations are derived that specify the contribution of the individual factors in the different paradigms. In the light of our results, the apparently discrepant behaviour of ear protectors under different conditions can be explained and correlated.
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