Inverse Square Law, SoundThe sound intensity from a point source of sound will obey the inverse square law if there are no reflections or reverberation. A plot of this intensity drop shows that it drops off rapidly.

Index Sound level measurement Auditorium acoustics  

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Inverse Square Law PlotA plot of the drop of sound intensity according to the inverse square law emphasizes the rapid loss associated with the inverse square law. In an auditorium, such a rapid loss is unacceptable. It is mitigated by the reverberation in a good auditorium. This plot shows the points connected by straight lines but the actual drop is a smooth curve between the points. 
Index Sound level measurement Auditorium acoustics  

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Sound Intensity from a Point SourceSound from a point source obeys the inverse square law. It's intensity in decibels can be calculated by comparing the intensity to the threshold of hearing.

Index Sound level measurement Auditorium acoustics  

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