Quote: I'm working on it. Quote: Yes. 110 dB is the target. The sensitivity is converted from manufacturer specs (often with 1 mW input) or taken from measurements and converted to 1V input. Since the source is assumed to output twice that (2 V), we have to subtract 6 dB. You can also attack this from another angle: 110 - (X + 20*log10(2 / voltage_required_to_reach_X_dB)). Quote: Right. If you use a DAP that outputs 1V you have to add 6 dB. If it outputs only 0.5 V add another 6 dB. or add: 20*log10(2 / X) where X is the Vrms of your source.