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ANSI S12.6-2016

ANSI S12.6-2016 is the most recent US standard that describes a method of evaluating hearing protective devices.  20 human subjects are required for insert-type hearing protectors, cap-mounted muffs and semi-aural devices.  10 human subjects are required for other types of muff-type devices and for helmets.  7 test frequencies are used.  The Noise Reduction Statistic (NRS) is then typically calculated from these data.  ANSI S12.68-2007 describes a rating system that requires ANSI S12.6-2016 data for rating calculations.