[Anthony]

Also, that calibration file is for the microphone pointing straight up. If you aim it at the target and use that cal file, you will likely see the effect you are describing.

I had the same problem with some speaker design work. I was showing that tail up right where the cal file went down. Unfortunately I was also trying to design a notch filter to compensate (for an effect that wasn't there).j

So bottom line: newecm.cal -- mic pointing straight up. Other cal files (that show a more flat top octave) -- mic pointing at target.

I have a thread in the mic/meter section that discusses this.

Only way to be sure is to have yours calibrated. But I understand the hesitation there.

Good luck,
Anthony