Abstract
Equivalent threshold sound-pressure levels were obtained for 24 normally hearing adult subjects from 125 to 8000 Hz using TDH-49 earphones in P/N 51 cushions and ER-3A insert earphones having a modified foam earplug inserted into the ear canal so that the outer edge was flush with the floor of the concha. Test versus retest thresholds within and across test sessions were not clinically significant for each earphone type at each frequency. The threshold difference between the TDH-49 and ER-3A and the ER-3A threshold levels at each frequency, referenced to an HA-1 (2-cc) coupler, were in very good agreement with the ER-3A proposed reference threshold sound-pressure levels at each frequency as reported by Wilber et al. [J. Acoust. Soc. Am. 83, 669–679 (1988)].
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
