I have a question for the more technically inclined, if the second harmonic is at -130dB, and if S/N is also 130dB, then why is SINAD only 123dB?
Imagine that the noise floor rises with higher output levels and lowers SINAD. The dynamic range measurement is performed at -60 dBFS so it is certainly possible for things to get worse at closer to 0 dBFS. For reference -> https://www.ap.com/technical-library/measuring-dynamic-range-in-apx500/.
Michael