EXPONENTIAL CONNECTORS 



95 



X 



O I 



z 

 < 



Q 



uJ 

 Q. 



5 



-I 



200 400 



FREQUENCY 



z 

 < 



200 400 



TREQUENCY 



C 



3 

 u 



*/) 2 



X 



UJ 



y I 



a 



2 



200 400 • 



FREQUENCY 



200 400 



FREQUENCY 



Fig. 5.6. The throat impedance characteristics of a group of exponential horns, with a 

 flare cutoff of 100 cycles and a mouth diameter of 20 inches, as a function of the throat 

 diameter. S\ is the area of the throat in square centimeters. Note: the characteristic 

 shown is the throat acoustic impedance multiplied by ^^i and divided by pc. r, resistive 

 component, x, reactive component. 



V-^s, 



Fig. 5.7. The throat acoustic impedance characteristics of two exponential connectors 

 with a flare cutoff of 100 cycles. The mouth of the horn is connected to an infinite pipe. 

 r, resistive component, x, reactive component. 



