[marsx]

What does Calibration of a Mic Mean exactly, (Measurement Microphone)?  I read a lot about how important it is to get a mic used for measurement (such as speaker accuracy or room accuracy), but I'm unclear about exactly what it means.  When someone calibrates the mic, do they actually physically alter something, or do they recommend that you place some device, like an EQ, between the Preamp and Amp or inserted in amp or do they just mean they compare it to a reference mic and then provide readouts or printouts of what the graph of your mic is compared to a flat mic?  Can anyone clue me in and help me understand.

Thanks,
marsx

[pjchappy]

To my understanding, it's a way to get a highly accurate measurement of the frequency response of your microphone.  Once that is used, any deviations the microphone has from a perfectly flat frequency response can be added or subtracted from any room, speaker, etc. measurements you make. 

Without a calibrated microphone, some peaks or dips in any room, speaker, etc. measurement you get may be a result of the peaks or dips in the microphone's response.  In simple terms, a calibrated microphone will tell you (or room measurement software) where to "fix" the measurements of your room, etc. by taking into account these peaks or dips in the microphone itself.

This may not be a perfect answer to what you're looking for, but it's what I understand it to mean.  So, someone please correct me if I'm wrong


Paul