Originally Posted by David Varner
I was not aware I didn't know if you were doing that for a reason or not. Anyway here is the screenshots of me adjusting the mic volume on my UMM-6 while generating pink noise. I thought it increased my SPL reading when I increased the mic level but it actually does the opposite.
Measurement were taken at -25db on the pre pro with YPAO enabled 7ft away.
Again, here is what I see, and there are differences from what you posted. First of all, my mic level can be varied from -31dB to +24dB. From your screenshot, it seems that your lower level is 0dB. Second, when I vary the mic level, the input level
seen by REW indeed varies by the expected amount. The input level is shown as a horizontal meter with readings in dBFS. Yet, when the input level varies, the mic reading is consistent at ~82dB. This is exactly what I would expect, because the level of the Speaker Cal Pink Noise is consistent at -12dBFS, i.e. it's level is not controlled by the mic input level. So, from my perspective, my mic is working as designed.
No, what is peculiar about the results you posted is that your measured level went from 94dB to 105dB, yet the signal generator level remained unchanged at -12dBFS. Something is wrong there. Did you actually perceive a change in the Pink Noise output level when you varied the mic level and, if so, would you not have felt that this was strange? Perhaps you can re-run the test, paying close attention to the Pink Noise output level--it should not change.
BTW, my measurements were taken near-field, i.e. the tip of the mic is 1" from the speaker. Not sure this would make any difference.