258 BELL SYSTEM TECHNICAL JOURNAL 



In the ordinary orchestral arrangement, the rear instruments will be 

 displaced in the reproduction depending upon the listener's position, 

 but the important aspect is that every auditor hears differing sounds 

 from differing places on the stage and is not particularly critical of the 

 exact apparent positions of the sounds so long as he receives a spatial 

 impression. Consequently 2-channel reproduction of orchestral music 

 gives good satisfaction, and the difference between it and 3-channel 

 reproduction for music probably is less than for speech reproduction 

 or the reproduction of sounds from moving sources. 



References 



1. "Some Physical Factors Affecting the Illusion in Sound Motion Pictures," J. P. 



Maxfield. Jour. Acous. Soc, July, 1931. 



2. "Minimum Audible Sound Fields," L. J. Sivian and S. D. White. Jour. Acous. 



Soc, April, 1933. 



