Custom hearing protection devices that are designed to attenuate sound levels uniformly across a wide range of the audible frequency spectrum ("flat frequency attenuators," also known as Musicians EarplugsTM) are a common recommendation for hearing loss prevention programs for musicians. This report will describe the use of probe microphone measures to verify whether or not the attempt of "flat frequency attenuation" is achieved in the individual, and suggest a framework for interpreting verification measures.
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https://aes2.org/publications/elibrary-page/?id=16402
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