Abstract
Equivalent threshold sound pressure levels were obtained on each ear of 48 normal hearing adult subjects from 125–8000 Hz using TDH‐49P earphones, referenced to a NBS‐9A coupler, and ER‐3A insert earphones, referenced to a HA‐2 coupler. At each frequency (N = 9), the thresholds were significantly higher for the TDH‐49P than for the ER‐3A; however, the test versus retest and right versus left ear thresholds were not significantly different. The unadjusted ER‐3A thresholds were in agreement with the reference equivalent threshold sound pressure levels (RETSPLs) reported by ISO [ISO 389, DAD 3, 1990]. After correcting for the subject's deviation from normal TDH‐49P hearing levels and coupler (HA‐2 to HA‐1), the ER‐3A thresholds were also in agreement with interim REISPLs reported by ANSI [ANSI S3.6‐1989, Appendix G]. A complete data base concerning normative ER‐3A thresholds will be presented and discussed in reference to the results of the present study, ISO and ANSI RETSPLs, and for future standardization.
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