B24FA 



OPSIG 

 300PS1G 

 OPSIG 

 500 PS I G 



240 

 200 



160 



120 

 80 



40 



20 















f 



^ 



/.,' 







1 



V 



'j 



t 



yy'' 





















■■/ 











600 



400 



200 



X 



-200 



-400 



-600 



20 



25 



30 



KC/S 



35 



40 



60 



Complex impedance is sufficiently changed by pres- 

 s ur i zat i on to d etune the t ransduc e r and thereby 

 Chang e driver r e qui r ements , 



16 



