Abstract
THE IMPORTANCE of routine calibration of earphones and bone-conduction receivers used with audiometers cannot be too highly emphasized. Otherwise, it is impossible: (1) to know whether thresholds of patients are contaminated by faulty equipment; (2) to know whether apparent changes in hearing over time for a patient are due to true differences in his performance or to variations in the equipment; and (3) to accurately compare results obtained in one clinic or laboratory with those found in another clinic or laboratory. <h3>Earphone Calibration</h3> The methods of calibrating earphones have been fairly well established and reported in the literature.<sup>1-3</sup>Several types of artificial ears are available commercially for calibrating earphones. In our laboratory, we prefer an artificial ear complement (Bruel & Kjaer) consisting of a standard artificial ear and 6 cc coupler, condensor microphone, and spectrometer, which enables us to determine the performance of audiometers or earphones and to note
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