pressure zone microphones i remember back before commercial mikes with the pzm label for pressure zone microphone started showing up i read an article in some engineering journal that described the principles involved all the physics aside from a practicle standpoint the author s said they built a prototype with nothing more than a small sony lavelier mike laid up against a large aluminum disk in demonstrating it at a presentation to audio engineers this was impressive enough that the people present were bugging them about where they could buy them anyway i want to build some to use as choir mikes wide coverage i ve had good luck using some small electret mike elements i got from digi key most of these are limited bandwidth peakey units but for a buck or two more i got the ones spec d to go out to khz with a bit flatter response the distance of the mike opening from the flat plate is kind of critical i m debating whether to mount it on it s side which puts the opening a shade under mm from the plate or mounting it with the opening actually pointing down into the plate at a small clearance i haven t dissected a unit like you can buy at radio shack to see how they do it thoughts paul marxhausen university of nebraska lincoln grace happens
