HORN LOUD SPEAKER SYSTEMS 



169 



to z^i and 2^2 and, therefore, shunts out the low frequency horn and 

 radiation issues from the high frequency horn. In the mid range, radia- 

 tion issues from both horns. The response frequency characteristic. 

 Fig. 8.19, shows the response range of the two horns. The throats of the 

 two horns may be chosen so that the efficiency characteristic of this loud 

 speaker will be the same as that of the two channel system discussed in the 

 preceding section. However, the power handling capacity is somewhat 

 smaller because the size of the diaphragm must be a compromise between 

 high and low frequency requirements. 



D. Multiple Horn Single Channel System. — The multiple horn single 

 channel system consists of a large number of multiple flare horns, each 



ASSEMBLY 



WIRING 

 DIAGRAM 



Fig. 8.20. A multiple horn, single channel system consisting of a cluster of multi-flare horns, 

 each coupled to a small diaphragm. 



driven by a diaphragm, Fig. 8.20. A comparison of the efficiency charac- 

 teristics of a multiflare horn loud speaker. Fig. 8.16, with a multichannel 

 system, Fig. 8.15, shows that the efficiencies are of the same order. The 

 multiple horn single channel system eliminates many of the following dis- 

 advantages of the multichannel system: the phase difference due to the 

 difference in path length between the two channels; the phase difference 

 and power loss in the filters and dividing network; the nonuniform direc- 

 tional characteristics due to the small size of the high frequency unit; 

 distortion in the relatively small throat of the high frequency horn. The 

 space required for the single channel system is greater than that for the 



