Motional Impedance Characteristics of Loud Speaker With a Very Small Horn

Abstract

The performance characteristics of a loud speaker having a very small horn shown in Fig. 1 and Fig. 11 was studied by means of the measurement of the motional impedance. The rhe result of which shows that it does not form a multi-resonant system like the ordinary loud speakers of prominent makers which had been studied by other authors up to the present, and the effect of the small horn upon the motional impedance, which is the measure of the velocity of the actuating element, is very limited to the narrow range of frequencies near the resonant frequency of the horn. When the resonant frequency of the horn coincides with that of the moving elemnt, the addition of horn changes the shape of the frequency characteristics as shown in Fig. 8 and Fig. 10. It is concluded that small horn such as treated here contributes very little to the improvement of the frequency response.