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After a decade I realized it was time to get a new measurement microphone. My old one, a Behringer ECM 8000, still works fine but the calibration has drifted so it is getting a bit out of whack. It would still be useful for "close enough" work. I can send you the cal file if you would like it.
If anyone wants it I will send it to you for only the cost of shipping, probably around $15 or maybe $20 if you are on the West coast. I can also bring it to the PE SDC next month if you will be there to get it in person. Send me a PM if you are interested.
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Also, I might be able to update the calibration curve using the substitution method and my other, and newer, calibrated microphone.