Two identical speakers in the same orientation produce waves of the same wavelength that are in phase. At a point midway between the speakers, you would expect to hear louder due constructive interference took place.
While destructive interference can result in the complete cancellation of the contributing waves, constructive interference causes an increase in the amplitude of the sum wave. The "speaker and baffle" experiment, which uses a small loudspeaker and a large, square wooden sheet with a circular hole the same size as the speaker, is an intriguing demonstration of both sound interference and diffraction. When music is played through the loudspeaker, out-of-phase sound waves from the speaker's front and back diffract into the surrounding area. Particularly at very low frequencies, where the wavelength is longest and the diffraction is therefore greatest, the two waves interfere destructively and cancel one another.
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