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Continuing problems with the consistency of the MX–41/AR earphone cushion’s physical and acoustical characteristics have led to the development of a one-piece cushion (model 51) by the Telephonics Corporation. The attenuation characteristics of this one-piece cushion have been measured according to ASA Standard 1–1975 (ANSI S3.19–1974) and are reported herein. The attenuation characteristics provided for the wearer by the model 51 cushions tend to be slightly greater than those of the MX–41/AR cushion but the differences are not generally significant, with α = 0.05.

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