STEADY STATE LOUD SPEAKER MEASUREMENTS 



147 



500 1000 



FREQUENCY 



Fig. 2 — Response-frequency characteristic of 115 cycle cut-off exponential horn 

 with moving coil type receiver. Measured outdoors at a distance of 12' from horn 

 mouth on the axis. 



50 



100 



500 1000 



FREaUENCY 



5000 



10000 



Fig. 3 — Response-frequency characteristics of 115 cycle cut-oft" exponential horn 

 with moving coil type receiver. Measured outdoors 2" from plane of horn mouth 

 with center of condenser transmitter diaphragm on horn axis and 13" from axis. 



