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American Journal of Audiology Vol.1 52-55 November 1992.
© American Speech-Language-Hearing Association
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Real Ear Sound Pressure Levels Developed by Three Portable Stereo System Earphones

Gail L. MacLean 1, Andrew Stuart 1, and Robert Stenstrom 2

1 Dalhousie University, Halifax, Nova Scotia, Canada
2 McGill University, Montréal, Province of Quebec, Canada

Differences in real ear sound pressure levels (SPLs) with three portable stereo system (PSS) earphones (supraaural [Sony Model MDR-44], semiaural [Sony Model MDR-A15L], and insert [Sony Model MDR-E225]) were investigated. Twelve adult men served as subjects. Frequency response, high frequency average (HFA) output, peak output, peak output frequency, and overall RMS output for each PSS earphone were obtained with a probe tube microphone system (Fonix 6500 Hearing Aid Test System). Results indicated a significant difference in mean RMS outputs with nonsignificant differences in mean HFA outputs, peak outputs, and peak output frequencies among PSS earphones. Differences in mean overall RMS outputs were attributed to differences in low-frequency effects that were observed among the frequency responses of the three PSS earphones. It is suggested that one cannot assume equivalent real ear SPLs, with equivalent inputs, among different styles of PSS earphones.

Key Words: portable stereo system earphones, real ear sound pressure levels, probe tube microphone

Submitted on December 18, 1991
Accepted on May 22, 1992


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