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Wolf Note?
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Wolf Note?
I have built a steel string guitar that has an annoying high pitched pulsing overtone. The guitar is an x-braced OM style with a thicker depth (more in line with a dreadnaught depth). I have built several of these that do not have the annoying overtone, so I don’t think its the specific shape that is causing it.
The overtone occurs when the note B2 is played on the G string, 4th fret. Interestingly, it does not occur when the open B string (same note) is played. There is a slight amount of the overtone 1/2 step up or down from the note (Bb or C), but it is most noticeable at B2, when played on the G string, 4th fret.
I have both an audio recording of the pulsing overtone and a visual recording of the spectral analysis which clearly shows the pulse at about 2800 Hz. This format will not allow uploading of these file types, but I can do that if there is another method.
Any ideas or suggestions about this would be welcome.
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5 Replies
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If there is a file you would like to share, send it to ian.davlin@gmail.com and I’ll get it up on here.
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A bit hard to tell from your description, but is what you are describing as an oscillation a beat frequency? If so, it is possible you have multiples of two resonant frequencies that are nearly colliding there.
2800 is about an F7. Do you have and FFT analysis that shows T(1,1)1, T(1,1)2 and T(1,1)3 data for your top? We could start there (although there are higher resonances that could be a possibility as well).
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I sent the audio and video files to Ian, and he has posted them below as a zip. Hopefully, you can access them. You are correct in that the pulsing is similar to the “beats” that you get when tuning two notes that are very close to the same. If this sound was constant, it would be less noticeable, and might be considered a resonant “shimmer”, but since it pulses, it is quite annoying.
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Bump
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