The Performance and Design of the Sound Radiator Consisting of the Acoustic Transformer and the Horn

Abstract

The theory and experiments on the acoustic transformer and horns (conical and exponential) have been reported by the same author in some details in this journal. In most cases, the horn is used in connection with the acoustic transformer. It is pointed out in this paper that the frequency characteristic of the acoustic impedance at the sending side of such a combined system is simple in nature, and design procedure becomes much simpler by considering such an impedance. The criterion and design procedure of such a combined system are given, together with a chart which enables us to determine, under a certain criterion, the dimensions of an exponential horn of finite length.