In the correct format, their data agree with 25 years of measurements by independent laboratories in the U.S. The purpose of this paper is to report that their manikin data, using their own recorded musical tokens, show a nearly flat response for the ER-15 within a few dB from 100 Hz to 16 kHz when plotted correctly on a standard logarithmic (musical) frequency scale. They suggest that REAT (Real Ear Attenuation at Threshold) measurements made in accordance with ANSI standard S12.6-1984 are invalid because they are made at threshold, and also that typical manikin measurements are invalid unless music tokens are used. Repeated claims in recent years that ER-15 Musicians Earplugs™ (Carlson, 1987) and ER-20® HiFi earplugs do not perform as advertised have been based on experiments published by Chesky et al. Reprinted with permission from The Hearing Review.
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