In this work we will examine the coupling between direct sound radiators. It will be shown that at low frequencies, the mutual impedance between a pair of transducers is analogous to that of two simple sources. Hence the magnitude of their interaction will be inversely proportional to their separation distance. The phase is proportional to the propagation time between a transducer pair. The implication of this result is explored in the design of a densely packed arrays, will be examined.

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