Your seeing the initial voltage because the capacitors have not fully charged. Once charged then your using them as a DC Block. As long as they are charged and not discharged you shouldn't see the 2 volts on the plug again. the ECM-55 I think is the whole Mic isn't it not just the Electret. if so then something like this would work best for you. http://www.bhphotovideo.com/bnh/controller...ow_to_High.html