Forgive me if I missed it, but how/what exactly did the OP use as the source with which to measure each microphone's response? Some of the Earthworks mics are showing responses out to 30kHz, so how did the OP generate that signal? I have 3 Behringer ECM8000 microphones and I'd like to repeat the OP's test with my mics, but even though there are a lot of photos and other information about the test procedure in this thread already, I'm still missing the big picture. Could someone describe the full test rig for me or point me to another thread which has those details?