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Yep, the AP can only measure around -118 dBu, which is around -94 dB at 50 mV. -118 dBu is the self noise of the analog input of around 1µV, and the APs are specced like that. So without additional preamp or changes in the measurement setup I am not aware of how to measure -100 dB.For example, WolfX-700 told measuring more than about 95 dB requires a low-noise amplifier:
Amir acknowledged the possibility of higher numbers through a low-noise amplifier when reviewing Pre90, but the method was not changed to keep consistency.