I recently got a Dayton UMM-6 to use as a secondary mic to back up my UMIK-1. It took me two tries to get a working mic (not a good sign) and then when I compared it to the UMIK, it has a severe roll-off on the high end. The cal files for the two mics are in fact not that different. I posted here about the differences, and tried several times to reconcile them with no luck.
So, assuming that the mics were in fact different, and always trying to understand what I'm doing, I decided to edit the UMM-6 cal file to see if I could alter the calibrated response and maybe get them a little closer. To my surprise, changing the UMM-6 cal file (I made some big changes, because otherwise it would have been hard to tell) made no difference in the RTA measured using the mic. I was careful to get the sample rates matched, and noted that the updated cal file was the only one listed in REW's preferences (I had to delete the original, in the process). Obviously I'm doing something wrong here, but never having messed with the cal files, it's not clear what.
So, assuming that the mics were in fact different, and always trying to understand what I'm doing, I decided to edit the UMM-6 cal file to see if I could alter the calibrated response and maybe get them a little closer. To my surprise, changing the UMM-6 cal file (I made some big changes, because otherwise it would have been hard to tell) made no difference in the RTA measured using the mic. I was careful to get the sample rates matched, and noted that the updated cal file was the only one listed in REW's preferences (I had to delete the original, in the process). Obviously I'm doing something wrong here, but never having messed with the cal files, it's not clear what.
