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How critical is it to have a calibration file for the particular mic? The mic I am looking at is this one:
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The results of your testing aren't meaningful unless you know you have a calibarated microphone. Not many mics are perfect down to 10hz, so they require a calibration file. In reality you should should get an ECM8000 calibrated professionally, but the units are so close that a lot of people simply use the calibration file here on the site. I do believe though, that dBX microphone you show use the same element as the ECM8000. But the ECM8000 is quite a bit cheaper than the dBX. Why not just get the ECM.
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When I use the RS meter to set my 75dB level, I just hook it directly into the soundcard, not through the mixer, correct?
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No, you place it beside the ECM8000 and read its meter when setting the receiver volume to 75dB during the REW setup. The ECM8000 doesn't have an SPL readout, so you need the RS meter to tell you when the level is 75dB. Then you just put the RS meter away. It isn't hooked to anything...
brucek