I don't usually link to other forums here, but here's a discussion about the ECM8000 mic and cal file over at DIY Audio:
http://www.diyaudio.com/forums/showt...hreadid=119164
What it comes down to is this:
1) if you use the ECM8000 cal file posted here at the shack, be sure to use it in the vertical position!!! That is all the cal file is good for. The response of the mic changes when horizontal
2) The old cal file we used to have here was actually pretty close to the horizontal orientation plots of the ECM8000 (and what was printed on the Behringer website/box)
3) There is a lot of variance in ECM8000 mics. We may have been lucky here to get so many that agreed.
4) The only way to be sure is to have it calibrated yourself for about $120
5) This pretty much only applies to high frequencies (3k+) The mic is pretty flat below that down to 40 Hz or so and many cal files seem to agree on the LF rolloff.
So consider this a PSA if you use the Behringer for full-range EQ work but are seeing weird results in your top octaves. In my case, I am measuring flat and hearing dull, or measuring ultra bright and hearing flat. Now at least I have an explanation for it.