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Reference threshold levels for an ER-3A insert earphone.

T Frank1, M J Vavrek

  • 1Department of Communication Disorders, Penn State University, University Park 16802.

Journal of the American Academy of Audiology
|January 1, 1992
PubMed
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This study established normal hearing thresholds for the ER-3A insert earphone. Results support the use of interim ANSI reference equivalent threshold sound pressure levels for clinical audiology.

Area of Science:

  • Audiology
  • Acoustics
  • Hearing Science

Background:

  • Standardization of audiology equipment is crucial for reliable hearing assessments.
  • Previous studies have shown variations in insert earphone performance.
  • Establishing accurate reference equivalent threshold sound pressure levels (RETSPLs) is essential for clinical comparability.

Purpose of the Study:

  • To determine normal hearing thresholds using the ER-3A insert earphone.
  • To compare these thresholds with existing standards (ANSI, ISO) and previous research.
  • To contribute to the standardization of insert earphones in audiological testing.

Main Methods:

  • Recruited 48 normal-hearing participants.
  • Measured hearing thresholds from 125 to 8000 Hz using ER-3A and TDH-49P earphones.

Related Experiment Videos

  • Utilized specific acoustic couplers (Bruel and Kjaer DB-0138 HA-2 and NBS-9A) for calibration.

    • Main Results:

    • Mean ER-3A thresholds closely matched thresholds from eight prior studies.
    • Adjusted ER-3A thresholds showed strong agreement with interim ANSI RETSPLs.
    • Unadjusted ER-3A thresholds were slightly higher than ISO RETSPLs, but averaged across nine studies, showed better agreement with ANSI RETSPLs.

    Conclusions:

    • The ER-3A insert earphone provides reliable hearing threshold data.
    • Interim ANSI RETSPLs are recommended for clinical application with insert earphones.
    • Findings support the ER-3A as a viable tool for standardized audiological evaluations.