THE USE OF CIRCUMAURAL EARPHONES IN AUDIOMETRY
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
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Four circumaural muffs were compared with the phonecushion device now standard for audiometry, the Willson Sound-Barrier, the Maico Auraldome, and 2 versions of the Tracor Otocup. Psychoacoustic loudness balancing by normal subjects was performed, and physical measurements by probe-tube microphone and by flat-plate coupler. Neither physical method was related closely enough at 4 kHz to the fundamental loudness balancing to serve as an independent calibration system for all circumaural muffs.
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