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'''3-1-205

The modal value of the thresholds of hearing at a specified frequency of an adequately large number of otologically normal subjects within the age limits of 18 to 25 inclusive.


Note: 1 Measured sound pressures should be converted to the corresponding sound pressure levels in decibels before the modal value is taken.


Note: 2 An otologically normal subject is a person in a normal state of health who is free from all signs or symptoms of ear disease and from wax in the auditory canal.

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{{languages|Normal threshold of hearing}}
[[Category:3.1 Acoustics and hearing]]
[[Category:Alphabetical Index]]
[[Category:IALA Dictionary 1970-89 Edition]]