reference equivalent threshold level

11.24  reference equivalent threshold level. At a specified frequency, for a specified type of transducer, for a specified type of coupler or artificial ear, the mean value of the equivalent threshold levels of an adequately large number of ears of otologically normal listeners between the ages of 18 and 30 years, inclusive. Unit, decibel (dB).

Annotation 1          Reference equivalent threshold sound pressure levels for several types of earphones, when used with several standard couplers are given in ANSI/ASA S3.6, American National Standard Specification for Audiometers.

Annotation 2          Reference values for equivalent-threshold force levels are given in ANSI/ASA S3.6.