this post was submitted on 26 Jan 2025
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[–] ChaoticNeutralCzech@feddit.org 6 points 1 week ago* (last edited 1 week ago)

As Frozengyro@lemmy.world mentioned, you can have interesting results by using harmonics - tones that are a whole (k) multiple of the base frequency because then the string vibrates in a standing wave forming a series of k+1 nodes (including ends) and k antinodes equally spaced across its length. Such notes are:

Closest note Freq. Harm. Relation to A
A1 55 Hz base (aka fundamental or open string frequency)
A2 110 Hz 2nd octave above A1
E3 + 2 cents 165 Hz 3rd perfect fifth from A2
A3 220 Hz 4th octave above A2
C#4 - 14 cents 275 Hz 5th major third from A3
E4 + 2 cents 330 Hz 6th perfect fifth from A3
G4 - 31 cents 385 Hz 7th far from a note on the chromatic scale
A4 440 Hz 8th octave above A3
B4 + 4 cents 495 Hz 9th major second from A4
C#5 - 14 cents 550 Hz 10th major third from A4
D#5 - 49 cents 605 Hz 11th very far from a note on the chromatic scale
E5 + 2 cents 660 Hz 12th perfect fifth from A4
F5 + 41 cents 715 Hz 13th very far from a note on the chromatic scale
G5 - 31 cents 770 Hz 14th far from a note on the chromatic scale
G#5 - 12 cents 825 Hz 15th minor second below A5
A5 880 Hz 16th octave above A4

Frequencies and relations are exact, closest chromatic (piano) notes other than A are approximate, the deviation is expressed in whole cents (hundreths of semitones). Notes more than 20 cents off the chromatic scale will probably sound off so they are discouraged. You could continue forever but frequencies above that will have a very weak response.

Yes, you will get some resonance on non-integer multiples but way less.