Influence of earphone-cushion center-hole diameter on the acoustic output of audiometric earphones.
Although the dimensions of the MX-41/AR earphone cushion are specified in ANSI S3.6--1969, nonstandard MX--41/AR cushions are still found on some audiometers. Variations in the diameter of the cushion's center hole are shown to affect the coupler calibration of the earphone and also hearing threshold measurements at high audiometric frequencies.
D000162:Acoustics; D001299:Audiometry / Q000295:instrumentation*; D001309:Auditory Threshold; D006801:Humans; D011571:Psychoacoustics