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I believe the 1 million point FFT will give 57 db process gain.They have a 70 db gain stage:
Have to do the math to see if the FFT process gain is more than this.
So their quote of 173 is really 173-57 or 116 db for that 20 khz band. Which is a touch over 19 bits. 173 divided by the amount per bit would give the 28.5 bits they are claiming. The 173 db number is misleading.