You are wrong about my "opinion". For most of my audiophile life, I went along with the idea that very precise alignment is important. Only in the last few years have I begun to seriously question that proposition. And the key word is "question". I am not about to say that alignment is NOT important. And I do align my cartridges carefully. But I don’t fret over a mm or 2, just because of my own experience with underhung tonearms and the fact that once or twice I have discovered that my alignment of overhung tonearms was way off (only because I periodically check with a protractor) without any audible associated deficit in SQ. This may be because, even based on your own data above, the associated distortion (which I still do not understand the nature of) is low compared to the sum total of all the other distortions associated with vinyl.
The reason I am still in the dark as to the nature of the distortion associated with minor misalignment of an overhung cartridge is that your response, "Were measured through the Löfgren A-B equations in reference to cartridge/tonearm alignment and under IEC, DIN or JIS standards." suggests to me that you misunderstood my question or I misunderstand your response. Do you mean to say that (someone) measured actual distortion of the audio signal in relation to IEC, DIN, or JIS standards? If that is what you mean to say, what sort of distortion was being measured? To say the standards used is not to describe the nature of the distortion. What I am asking cannot be answered by any equation, because an equation will give you a theoretical answer only, and my real question is whether reality conforms to theory. Lofgren, Baerwald, and maybe even Stevenson all did their work around 1940, so far as I can find out. Way before stereo or any high fidelity home audio.
