Cochlear gain reduction via efferents is sharply tuned with a 1300 Hz bandwidth.

Evidence

Maximum gain estimates of about 40 dB indicate little effect of any efferent-mediated cochlear gain reduction, and are associated with precursor frequencies well above and below that of the signal frequency of 4 kHz. Minimum gain estimates of about 20 dB indicate maximal effect of efferent-mediated cochlear gain reduction, and are associated with precursor frequencies close to that of signal frequency of 4 kHz. The estimated 10 dB bandwidth of the efferent-effect filter is 1300 Hz (Q10 of 3.1). — Dijk, Pim van, Physiology, Psychoacoustics and…, 5953