Topic by scherbakov.al

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  • scherbakov.al
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  • From: Sankt-Petersburg
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Topic: spectrum profile and sympathetic resonance

If in the spectrum profile all the overtones are put on -80dB, and one leave to make loud in 80db, then there is no change in the sympathetic resonance of this note. Ie it turns out that sympathetic resonance works without taking into account the spectrum settings?
Audio example (the note "C" contains the entire spectrum, and the note "H" only the 17th overtone). They have similar resonances:
http://www.forum-pianoteq.com/uploads.php?file=1.mp3

And another question: why when playing with different dynamics, then there are overtones, then disappear. When all the overtones are set to -50dB, and the 17th overtone to + 80dB? With a loud game, only the 17th sounds, and with a weak game, other overtones appear, although they have a difference of 130dB?
Example:
http://www.forum-pianoteq.com/uploads.php?file=2.mp3

Although with a very quiet game, too, there is only one 17th overtone. In the dynamics of mezzo piano appear the rest ..

Last edited by scherbakov.al (04-12-2017 23:33)

Reply by Philippe Guillaume

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  • Philippe Guillaume
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Re: spectrum profile and sympathetic resonance

scherbakov.al wrote:

If in the spectrum profile all the overtones are put on -80dB, and one leave to make loud in 80db, then there is no change in the sympathetic resonance of this note. Ie it turns out that sympathetic resonance works without taking into account the spectrum settings?

This is normal (and a bit tricky). When you change the spectrum profile, you change the properties of the hammer, not of the strings. Let's say you press down silently C2 and strike E4. Your spectrum edit has affected the spectrum of E4 (hence its softer sound), but not the properties of the C2 string (hence the resonance of its 5th partial excited by the fundamental of E5).

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