Peter wrote: > > Condenser microphones are sensitive to sound pressure, not to sound > > pressure gradient. So, yes you need to sort of integrate the signal. > > ????!!!!!???!??? could you sort of explain this ? The greater sound pressure at some moment =96 the bigger capacitance of condenser of a mic and lower its potential at that moment. The greater air speed at some moment =96 the greater speed of a membrane of dynamic mic - the bigger its EMF. Human ear acts more like dynamic mic than condenser one, so when listening to sound amplified from a condenser microphones without frequency correction, you'll hear it more "high frequency". (The higher frequency =96 the lower speed of vibration at the same pressure, if I am not mistaken) Regards, MS PS We spent June at big Tel Aviv, wonderful city. This street on south near the park, left side of the street =96 Tel Aviv, right side =96 Ramat Gan town ;-) Fantastic architecture of city's north. We walked many kilometers a day, just couldn't stop. Great impression. -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist