Moreover, this procedure only provides estimates of gain for a single input level. ![]() However, sound-field based functional gain testing is highly subjective, time consuming, unreliable and provides limited information about the true response characteristics of the given hearing instrument in-situ. Before REM equipment became commercially available, one of the most common fitting verification procedures used was the functional gain test. ![]() For more than twenty years, hearing health care professionals have been using probe microphone measurement as an objective method for the selection, fitting and verification of hearing instruments.
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