IMPORTANT: Doubt about graphic spectrum AUDACITY

Hello everyone, I have a question.
I did some acoustic measures for college work, and I want to use audacity to see the spectrum of these measures,

  1. Open audacity
  2. I have Imported to measurements made.
  3. I selected a piece of the action.
  4. I went to analyze → analyze spectrum.
  5. I obtained a graph.

NOTE: The piece I selected, was the calibration tone (94 dB SPL at 1kHz).

So, my question is on the graph:
In the graph img on the left side, I get negative values, I want to know which are referenced (by Audacity) these values (eg referenced to 1 volt, millivolt, etc.).

I think this refenciado to 1V / Pa

Thank you .

Please don’t double post. A forum elf has to OK your post for it to appear.


The dB is referenced to 0 dB being “full scale”.
The FFT data is normalized such that a 0 dBFS sine wave is displayed by Plot Spectrum as 0 dB.