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EN 352-8:2008
Hearing protectors. General requirements Part 8: Entertainment audio ear-muffs

This standard requires all of the testing specified in EN 352-1 with the additional clause below tested on additional samples.

Maximum sound pressure levels generated by entertainment audio

The maximum sound output levels of the device are measured using a miniature microphones placed into the ear canals of human test subjects. The mean value of 16 measurements plus one standard deviation shall not exceed 82dB(A).