Calibration of earphones on a flat-plate coupler: Exploring two setup procedures

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Abstract
The frequency responses of two earphones with circumaural cushions and one earphone with a supraaural cushion were repeatedly measured on a flat-plate coupler. The coupler was used in a normal position with the earphone on top and in an inverted position with the coupler resting on the earphone cushion. The advantage of the latter configuration lies in the ease with which the coupler and the earphone can be precisely mated; which, in turn, suggested that reliability may be improved with the inverted configuration. However, measurements made after careful mating of the earphone and the coupler indicated that the reliabilities of the measurements for both the normal and inverted configurations were satisfactory with the standard deviation of a measurement having an average value of 0.45 dB. For two of the phones the sensitivities did not differ significantly between the two configurations; while for one, slight but reliable differences were observed.

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