I'm sure we've all seen these things. My Harman Kardon receiver came with a nice looking transparent cone shaped calibration mic. Many receivers have mics for this purpose. This one plugs into the actual remote, and the signal is sent from the remote itself. I'm curious as to what these microphones actually ARE. I wanna tear mine open and use the mic inside for a headphone measurement rig. To do that, I need to get a signal out of it, though. I assume it's just another electret condenser omni mic with calibration curve applied inside the receiver, right? If I can use this thing, I can just wire it up, plop the capsule into a plug, and stuff it into my ear!