本标准规定了在听力阈值下测量听力保护器声衰减的主观方法。本标准适用于听力保护器，包括耳塞和耳罩，它们通常用于降低耳朵暴露的噪音。该方法是一种实验室方法，旨在在受控测量条件下产生可重复的值。这些值仅在使用者以与受试者相同的方式佩戴听力保护器的情况下，才反映听力保护器的衰减特性。

This Standard specifies a subjective method for measuring sound attenuation of hearing protectors at the threshold of hearing. This Standard is applicable to hearing protectors, including earplugs and earmuffs, that are commonly used to reduce the noise to which ear is exposed.The method is a laboratory method designed to yield reproducible values under controlled measurement conditions. The values reflect the attenuating characteristics of the hearing protector only to the extent that users wear the device in the same manner as did the test subjects.