The importance of transit time and intensity differentials in the sounds picked up by microphones and reproduced by loudspeakers is discussed. The relationship of sources and microphones, as well as loudspeakers and a listener is discussed and graphic examples are presented. Much of the difficulty encountered in attempting to recreate an acoustic field can be traced to the fact that the acoustic pressure varies with the square of the distance, while the transit time for an acoustic wave is a linear function of distance.
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