Attenuations from hearing protectors and the ABC classification system
AbstractEvaluates the accuracy of the CSA ABC class system for rating hearing protectors. The noise level of the protected ear of twelve protectors (six Class A and six Class B) subjected to twelve noises were calculated. It was shown that there is large variation among sound levels from both protector classes as well as overlaps, resulting mostly in overprotection. It is recommended that the ABC system be changed to some other rating system used by the international community
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