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Reference thresholds for the ER-3A insert earphone.

L A Wilber1, B Kruger, M C Killion

  • 1Program in Audiology, Northwestern University, Evanston, Illinois 60208.

The Journal of the Acoustical Society of America
|February 1, 1988
PubMed
Summary
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The ER-3A insert earphone can often replace the TDH-39/MX-41AR without recalibration. Analysis of five studies confirms its reference threshold levels closely match established standards for audiology.

Area of Science:

  • Audiology
  • Acoustics
  • Hearing Instrument Technology

Background:

  • The ER-3A insert earphone is increasingly considered a substitute for the TDH-39/MX-41AR.
  • Existing data requires analysis to establish reliable reference threshold levels for the ER-3A.

Purpose of the Study:

  • To analyze data from multiple studies to estimate reference threshold levels for the ER-3A earphone.
  • To compare these estimates with manufacturer specifications and established audiological standards.

Main Methods:

  • Meta-analysis of data from five recent studies involving the ER-3A earphone.
  • Conversion of sound pressure levels (SPLs) from a 2-cc coupler to Zwislocki-coupler-equivalent SPLs.
  • Comparison of results with provisional reference threshold SPLs and revised minimum audible pressures.

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Main Results:

  • Mean data from the five studies align within 1 dB of the ER-3A manufacturer's provisional reference threshold SPLs (HA-1, 2-cc coupler).
  • Converted SPLs show agreement within 1.5 dB with Killion's revised minimum audible pressures across audiometric frequencies.
  • The ER-3A earphone demonstrates reliable performance comparable to established standards.

Conclusions:

  • The ER-3A insert earphone can be used as a substitute for the TDH-39/MX-41AR without recalibration in most audiological applications.
  • Both manufacturer's provisional SPLs and the study's averaged results provide accurate reference levels for the ER-3A.
  • This analysis provides a validated basis for using the ER-3A in hearing assessments.