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Abstract
Objective: Equivalent threshold sound pressure levels (ETSPLs) were determined for RadioEar DD65v2 audiometric headphones.
Design: The pure-tone hearing threshold levels were measured for 11 audiometric frequencies between 0.125 and 8 kHz, according to the conditions specified in ISO 389-9. ETSPLs are provided for an ear simulator according to IEC 60318-1, complemented by a comprehensive uncertainty budget.
Study sample: The study was based on 25 otologically normal test subjects.
Results: ETSPL values are provided with expanded measurement uncertainty. The data are compared for left/right ears as well as male/female test subjects.
Conclusions: The results of both studies may be used to update ISO 389-8, the RETSPL standard for circumaural audiometric headphones.
Acknowledgements
The authors thank Interacoustics A/S for providing three sets of DD65v2 headphones. Special thanks to Sven Vollbort for carefully conducting the preparatory tests as well as the hearing threshold measurements for this study.
Ethical approval
The Declaration of Helsinki was adhered to in all our measurements, and a positive vote of the local ethics committee (Vote 2/15) was given.
Disclosure statement
The authors report no conflicts of interests. The authors alone are responsible for the content and writing of the paper.