[Dynamic range of acoustic reflex and its importance for hearing aid evaluation (author's transl)].

It is reported on the dynamic range of acoustic reflex in the case of normal hearing. Stimulation is carried out with speech noise under free field conditions. The sensitivity of impedance measurement is increased by using an averager, which enables acoustic reflex measurements at sound pressure levels of about 70 dB. Further an exact evaluation of input-output-characteristics becomes possible by this procedure. Basing on this consideration the possibility of objective hearing aid evaluation is discussed. The fundamental point of this technique should be the compensation of pathological input-output-characteristics by suitable hearing aids.