Equivalent threshold sound pressure levels (ETSPL) for Interacoustics DD 45 supra-aural audiometric earphones

Abstract

This paper describes the determination and results of pure-tone equivalent threshold sound pressure levels for the Interacoustics DD 45 audiometric earphone equipped with standard Model 51 cushions. The size and shape of the DD 45 transducer resembles the classic Telephonics TDH 39 earphone. Pure-tone hearing threshold measurements were performed for both ears of 29 test subjects. All audiometric frequencies from 125 to 8000 Hz were used. The data are intended for inclusion in future standardized reference equivalent threshold sound pressure levels. The results show that the DD 45 may be a good substitute for the THD 39 without the traditional 5-dB problem at 6000 Hz.

Free-field correction values for Interacoustics DD 45 supra-aural audiometric earphones

“…All subjects had normal hearing with threshold levels between Ϯ 10 dB HL and with a single frequency at 15 dB HL allowed. The subjects had no history of ear diseases as reported in a previous investigation (Poulsen, 2010).…”