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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
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