Real-ear threshold level comparisons between the Telephonics TDH-39 earphone with a metal outer shell and the TDH-39, TDH-49, and TDH-50 earphones with plastic outer shells

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Abstract
There has been a recent expression of concern that the metal shells of most audiometric earphones could consitute a safety hazard because they can conduct electricity and are often used near electrical-power supplies. In response to this potential safety hazard, Telephonics has constructed new TDH-49, and TDH-50 earphones with nonconducting outer shells. Real-ear threshold comparisons were used to determine if the samples of plastic-cased earphones could be substituted directly for the standard, metal-cased earphones. The ten, trained-listener subjects showed normal audiometric thresholds with good reliability. The real-ear performance of the plastic-cased earphones did not differ significantly from the of the metal-cased earphones and it was concluded that these earphones could be used interchangeably in audiometric testing.

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