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EN 352-6:2002
Hearing protectors. General requirements Part 6: Ear-muffs with electrical audio input

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

Sound output levels

The sound output levels of the device are measured using a miniature microphones placed into the ear canals of human test subjects. The electrical input level at which 82dB(A) is measured at the ear is reported.