![Sample our Medicine, Dentistry, Nursing & Allied Health journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/5944/TOC-Subject-Sample-2021-Medicine-Dentistry-Nursing-Allied-Health.jpg"})
Abstract
Objective
Free-field correction values were measured for RadioEar DD65v2 audiometric headphones.
Design
Free-field correction values, that is, the difference GF-GC between the free-field sensitivity level GF and the ear simulator sensitivity level GC, were determined by loudness level comparisons between the headphone and a plane progressive wave in a free sound field.
Study sample
The study was based on 17 otologically normal test subjects.
Results
Frequency-dependent free-field correction values are provided. The free-field correction of the speech level was determined to be 3.2 dB.
Conclusions
Free-field correction values were determined for RadioEar DD65v2 audiometric headphones with an expanded measurement uncertainty.
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 measurements for this study.
Ethical approval
The Declaration of Helsinki was adhered to in all our measurements and the local ethics committee approved the study (vote 2/15).
Disclosure statement
The authors have no conflicts of interests to report. The authors alone are responsible for the content and writing of the paper.
Notes
1 The subject indicated that the loudspeaker/headphone was perceived louder by stepping on the left/right switch. In this case, a microcontroller recognized the change in voltage and communicated the response to the measurement program. If no response was recorded, the presentation was repeated with the same SPLs.
2 The attenuators were used for suppressing the residual noise of the audiometer output stage.