Abstract
Routine calibration of large circumaural earphones has long been a problem due to lack of a standard coupler, variability found with placement on a brass plate coupler, and difficulties in probe tube calibration techniques. In order to provide a practical solution to the above problems so that a pair of large circumaural (Pedersen) earphones could be used routinely, four studies were carried out at UCLA. In these studies, a Plexi-glass adapter ring was developed that, when fitted with a standard artificial ear and attached to the earphones, furnished a method whereby routine acoustic calibration of the earphones could be carried out easily and repeatedly. Comparisons were made between the Pedersen earphones and TDH 39 earphones using: (1) the adapter ring and artificial ear; (2) a probe tube; and (3) psychophysical techniques. These comparisons made it possible to achieve a method for routine calibration of the large circumaural earphones. The above studies also indicated some problem areas in the use of certain psychophysical techniques such as loudness balancing.
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