Hi.
●The 1st diagram shows that the cut-off frequency of Tone2 Pro is lower then Tone1,because the integrating capacitor value of Tone2Pro’ LPF is higher than Tone1.Thus it can weaken the high-frequency signal.
●The 2nd digram I want to know which signal did you test,RCA balanced？RCA Single end？4.4 JACK or 3.5 JACK? Two products may have 180 degree phase difference.
●The 3th digram I doubt there probably are some problems with the test way. I can show you the digram about the THD+N Radio Vs Frequency at 44.1KHz/48KHz/96KHz sample rate by the APx555.
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