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Earphones in extended high-frequency audiometry and ISO 389-5
A Rodríguez Valiente1, J R García Berrocal, A Roldán Fidalgo
1Ear Research Group, Department of Otorhinolaryngology, Hospital Universitario Puerta de Hierro, Universidad Autónoma de Madrid , Spain.
Objective:
To determine common reference equivalent threshold sound pressure levels (RETSPL) for the earphones used in the extended high-frequency (EHF) range, as different earphones are commercially available, but there are not RETSPLs for each model.
Design:
Hearing threshold sound pressure levels were measured up to 20 kHz for the Sennheiser HDA 200 audiometric earphone, and were compared to the ISO 389-5 (2006) norm and other investigations using that earphone and different ones.
Study Sample:
A total of 223 otologically-normal subjects (aged 5-25 years old) participated in the hearing determination.
Results:
The results are in good agreement with previous studies of hearing thresholds using the same and other earphones.
Conclusions:
The results of the present investigation are relevant for the international standard for the calibration of audiometric equipment in the 8 to 16 kHz frequency range, ISO 389-5. The data may be used for a future update of the RETSPL for circumaural and insert audiometric earphones.
