Bit noisy at the top end of the cal trace, but useable. Did you try changing the sample rate to see if that cleans it up? Apply a little smoothing before generating the cal file.
Finally got back to this, I discovered there are 2 small Dip switches on the back of the UsbPre 1.5 that reduce the microphone sensitivity by 15 dB, the results are much better now.
Yes, the second graph looks more like truth.
Here's results from my USBPre2
44.1, mic level out to mic in loopback, -15dB attenuation
In most cases CAL file is really not needed
The USB 1.5 doesn't have mic out, I have to use one of the phono 'PC Audio' left/right to XLR mic in.
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