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Thank you very much for the clarifications.

I still maintain that when the spectrum analyser is set to display absolute levels in dBFS, it should show 0dBFS when a full- scale sine wave is present (under no spectral leakage conditions). I insist that Multi Instrument is incorrect in displaying ...

I am currently evaluating Multi-Instrument and I am puzzled by some inconsistencies I found with the spectrum analyzer. I simply cannot rely on the spectrum display to read the absolute level of the input signal with any acceptable degree of accuracy. Here's my setup:

Audio Precision System Two ...