Thread: Harp Guitars
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Old 11-18-2016, 02:33 PM
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This "resultant" stop in pipe organs is relatively common, and can be quite effective.
Quote:
(Two) stops use this acoustical effect to produce tones in the 32' and 64' octaves, using smaller (and thus less costly) pipes than would normally be necessary. One of these stops, labeled as 32' or 64' pitch, is comprised of two ranks which sound the 1st and 2nd harmonics of the desired pitch (that is, an octave and a twelfth above the desired pitch). For a 32' stop, the two ranks are 16' and 10-2/3'; for a 64' stop, the two ranks are 32' and 21-1/3'.
http://www.organstops.org/r/resultant.html (Be sure to listen to the sound clips at the end of the article.)

I'm not sure how this resultant, difference tone, or combination tone (various descriptions for the same acoustic phenomena) relates to harp guitars, but in pipe organs it is a handy way to produce very low pitches without having to have very long pipes.

cotten
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