Hi Matthew, it is not possible what you say, because, as you see in my first post, I had 3 recorders at the same place, at the same moment, and the results are completely different. I had 2 audiomoths, both with medium gain, and the records are different deppending only just on the sample rate you set. Even I tried in an open field, with no possibilities of echo effects, and there is still the same problem.

I have exactly the same problem. I want to record bird NFC, but I don’t know why, bat calls appear in low freqüencies, and the place where I'm recording, it's full of them, so I cannot hear nothing else (it is really annoying). Here you have 3 spectrograms of the very same moment: Audiomoth (1) with sample rate configuration at 32kHz: Audiomoth (2) with sample rate configuration at 192kHz: Ordinary Olympus recorder: It is like if the Audiomoth transforms bat calls to low frequencies just to show them. That's a big problem, because if you want to avoid that bat calls match with bird calls, you need to set the highest sample rate, and this way, files are so big that just in 1 or 2 nights the SDcard is full. Also, since you get very heavy files, it is very slow to process them.