The frequency response of the ER-2 speaker at the eardrum.

Distortion-product otoacoustic emissions are often measured using ER-2 speakers and the ER-10B microphone probe (Etymotic Research). The frequency response at the eardrum of the ER-2 speaker used in this configuration has not been described. An indirect estimate of the average eardrum frequency response of the ER-2 speaker used with the ER-10B probe has been obtained. The average eardrum frequency response varies less than ±5 dB from 0.3 to 10 kHz.

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