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Yeah I can’t really follow it tbh. My very basic interpretation is that 2nd harmonic distortion amplifies or reinforces the “nice” sounding bits. For some people and some types of music it also creates a more “3D” soundstage… somehow.
I’m into all this though. I like to have a vague understanding of how stuff works, rather than just “it’s old and/or expensive and has glowing bits so must be good”.
This is dense, but good. Couldn't find a youtube vid
https://www.passdiy.com/project/articles/audio-distortion-and-feedback