- Your cal file should use the fullstop (period) as its decimal separator. If e.g. you have an IBF (German) cal file, that will have commas, so you need to search&replace to change them all.
- The cal file shouldn't have any comment-lines at the top or end.
- DRC seems to need a "zero frequency" and a "Nyquist frequency" entry in the cal file. so e.g. if you look at the original ECM8000.txt, it has a line for 0Hz and 22050Hz. You should add these lines to your new cal file if necessary. Keep the same gain and phase values as the first, and the last, real entries respectively (so if your mic cal starts at 20Hz with "20 -1.23 4.56" you should have a line "0 -1.23 4.56" before that. And the same for the 22050Hz at the end of the file).
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