LOW resonance PIEZO Electric drivers ?(do i have to make one?)

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Discussion Overview

The discussion centers around the use of piezoelectric drivers for generating low-frequency sound waves, specifically in the context of measuring acoustic properties using an impedance tube. Participants explore the feasibility of achieving resonance below 20 Hz and the challenges associated with traditional sound generators.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant expresses the need to measure acoustic properties from 20 Hz to 4 kHz and questions the availability of piezoelectric devices that resonate below 20 Hz.
  • Another participant notes that piezoelectric generators are typically effective at high frequencies and questions their utility at low frequencies.
  • A participant references a PDF related to using piezoelectric devices for low resonances but does not provide clarity on its content or relevance.
  • There is a suggestion that modern speakers with multiple elements may outperform piezoelectric devices for generating quality sound.
  • One participant mentions using microphones for measuring acoustic attenuation, indicating a method for testing without relying solely on piezoelectric drivers.
  • There is a request for clarification on how a piezo can generate a 20 Hz tone, indicating uncertainty about the operational capabilities of piezoelectric devices at low frequencies.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the effectiveness of piezoelectric drivers for low-frequency sound generation, with differing views on their capabilities and applications.

Contextual Notes

Participants express uncertainty regarding the specific operational characteristics of piezoelectric devices at low frequencies and the implications for their experimental setups. There are also unresolved questions about the best methods for measuring acoustic properties.

frd
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I have been up to make an impedance tube to measure acoustic Z and calculate absorption coefficient of materials . and having a sound generator(speaker driver) in it usually gives you near 60 hz response so your data will be charted starting 60hz and above.

My goal is to measure from 20hz to 4khz . and its hard to stick a large box in one side of tube to get low response if possible .

Anyhow I saw somewhere that they have used PIEZOELECTRIC as sound generator so they measure from 20hz.

Question is where to find a piezo that resonances below 20hz ?

or how to make one if I have to ...?

Thanks
 
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The reason people usually chart above 60Hz, as I understand it, is interference from the mains. Piezoelectric generators are good for extremely high frequencies. I'm not aware of any benefit at low frequencies.
 
how are you sure i have a pdf of set up using piezo for extremely low resonances ...
 
Last edited by a moderator:
frd said:
how are you sure i have a pdf of set up using piezo for extremely low resonances ...

Where did you see a PDF file mentioned in his response?
 
frd said:
I have been up to make an impedance tube to measure acoustic Z and calculate absorption coefficient of materials . and having a sound generator(speaker driver) in it usually gives you near 60 hz response so your data will be charted starting 60hz and above.

My goal is to measure from 20hz to 4khz . and its hard to stick a large box in one side of tube to get low response if possible .

Anyhow I saw somewhere that they have used PIEZOELECTRIC as sound generator so they measure from 20hz.

Question is where to find a piezo that resonances below 20hz ?

or how to make one if I have to ...?

Thanks

If you want to generat good-quality sound, it's hard to beat the modern speakers with multiple elements and crossovers. And for measuring the acoustic attenuation (I'm not sure about the impedance you mention though), you can use a microphone before the material as the "Reference", and a microphone after the materal for the "Test" signal, much like you have on the Gain-Phase side of an Impedance meter like the HP 4194.
 
berkeman said:
Where did you see a PDF file mentioned in his response?


I posted the pdf ...
 

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