The interaction of two, simultaneously sounded flue organ pipes of the same nominal tone were investigated in laboratory experiments. Three different phenomena were observed: simple superposition of the two sounds; coupling of the two pipes through the surrounding air; and -melting- the two sounds into a new, common sound with a bit higher frequency. The last two cases appear only for neighboring pipes. The results of the experiments and the possible physical explanations are discussed.
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https://aes2.org/publications/elibrary-page/?id=6621
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