I just did a bit of digging on electret specs. It seems that most of the ones I looked at had? sensitivities down around -44 db (volts/Pa) with SNRs in the neighborhood of 60db. But the one that Hans specified is much more sensitive at -24db with SNR around 80db. This leads me to believe that grabbing a random electret is likely to give disappointing results. There are some that specify the sensitivity as a positive number (52db for example). I would take this to mean -52db. Either that or they have specifies SNR instead of sensitivity.

Anyway, I was surprised to find that the one used by Hans seems to be somewhat atypical based on my quick survey of electrets. Maybe I just looked in the wrong places?

73,

Tony

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