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Attenuation provided by four different audiometric earphone systems.

T Frank1, D C Wright

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

Ear and Hearing
|February 1, 1990
PubMed
Summary
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The ER-3A/ER3-14 insert earphones offered the highest sound attenuation. Audiocup enclosures showed less attenuation than expected, suggesting a need to update testing standards for earphone cushion measurements.

Area of Science:

  • Audiology
  • Acoustics
  • Hearing Science

Background:

  • Accurate measurement of earphone attenuation is crucial for hearing protection and research.
  • Existing standards for measuring earphone cushion attenuation may not reflect real-world conditions.

Purpose of the Study:

  • To quantify the sound attenuation of different earphone types and cushions.
  • To compare measured attenuation with existing literature and standards.
  • To recommend updates to measurement methodologies.

Main Methods:

  • Real-ear attenuation at threshold (REAT) paradigm used.
  • Thirty normally hearing subjects participated.
  • Tested TDH earphones with MX-41/AR and P/N 51 cushions, Audiocup enclosures, and ER-3A insert earphones with ER3-14 foam earplugs.

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Main Results:

  • ER-3A/ER3-14 insert earphones provided the highest attenuation.
  • MX-41/AR and P/N 51 cushions offered similar, lower attenuation.
  • Audiocup enclosures showed lower-than-expected attenuation, particularly at low frequencies.

Conclusions:

  • The ER-3A/ER3-14 insert earphones are effective for sound attenuation.
  • Audiocup enclosure attenuation data deviates from previous studies, indicating potential issues with current measurement standards.
  • ANSI S3.1-1977 supra-aural earphone cushion attenuation values determined via pure-tones in a free-field should be revised.