maximum and minimum frequencies in the audible range with two stereo loudspeakers?

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Two stereo loudspeakers are separated by a distance of 2.12 m. Assume that the amplitude of the sound from each speaker is approximately the same at the position of the listener, who is 3.75 m directly in front of one of the speakers. (a) For what frequencies in the audible range (20 - 20000 Hz) will there be a minimum signal? (b) For what frequencies is the sound a maximum?
 
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