One can put together a system that measures really well but in the end, it’s not an oscilloscope that’s going to listen to the system-- it’s individual human beings, whose perception of sound and aesthetic preferences can vary considerably, to say the least.
Agreed
Everybody will have their own definition of what fidelity is, but to me fidelity does not equal measuring well on a scope. 2nd order harmonics is not distortion, 5th order harmonics is.
Fidelity in audio is faithfulness to the reproduction of music, not faithfulness to reproducing a sine wave on a scope. Measurements that give the average deaf engineer wood is of no consequence to anyone with an interest in audio.