Über die obere Grenzfrequenz von Hörgeräten

It is the object of the development of high-fidelity reproduction to widen the frequency band of reproduction. To this end the frequency response of the acoustic amplification and the maximum output is important. In the past the upper limit was about 2.5 kc/s, limited by the microphones and earmoulds used but an extension to 4.6 kc/s is possible if one improves the acoustic units in previous constructions and adopts open earmoulds.