[dyohn]

Which Behringer mic? If it's their test mic (ECM8000) it is omni-directional but polar, meaning it will reject sounds coming from the cable end. Also, it should have shipped with a calibration file that can be input into a software-controlled RTA. If you need to have a microphone calibrated (which means it's FR is measured against known standards and the results reported to you) you'll have to find a good audio lab in your area.