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A comment on Undetectable very-low frequency sound increases dancing at a live concert. Parent comment

Re:Undetectable very-low frequency sound increases dancing a... by Blackthorn on Tuesday November 08, 2022 @05:03PM (#33524935)
Dumb question but how is the piano capable of generating these frequencies? I thought the strings couldn't get nearly long enough and the low frequencies that you heard from piano were just psychoacoustics.
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Re:Undetectable very-low frequency sound increases dancing a... by quercusa on Tuesday November 08, 2022 @05:44PM (#33525326)
The bass strings are wound with copper wire so that the mass is much higher and the resonant frequency much lower.
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Re:Undetectable very-low frequency sound increases dancing a... by Nition on Tuesday November 08, 2022 @05:59PM (#33525465)
The amount of space needed for a certain frequency in air is different to the length needed for that same frequency in a wire.

It might help to see the formula, which is:

Frequency = sqrt(tension/(mass / length)) / (2 * length)

So length, tension, and mass are all factors. Modern upright pianos also string the bass strings diagonally to give them a bit of extra length.

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Re:Undetectable very-low frequency sound increases dancing a... by dehrmann on Tuesday November 08, 2022 @10:42PM (#33527292)
I can almost imagine seeing the low bass string on the longest piano vibrating. The frequency is so low you can pick hear the peaks and valleys.
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