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"At what point is 81st inaudible?"

\Or maybe at what point is it produced at all?

Nelson Pass himself seems to have suggested an answer of sorts. Consider this chart from his 'Audio Distortion and Feedback' treatise ...



This seems to imply that 81st order distortion won't happen at any conceivable level of feedback; apparently not at 40dB or .0001% distortion (which is as far as the graph goes).

Visually extrapolating, (red line added), Pass's chart it pretty much looks like all practical levels of high-order HD will emerge before 20dB of feedback -- higher than the 6th order illustrated to be sure, but at a steeply diminishing level.

Something that Pass didn't dwell on in his article is that fact that more feedback lowers ALL orders of distortion.

BTW, I own Pass Labs amp and like it a lot.




Dmitri Shostakovich



Edits: 09/26/15 09/26/15 09/26/15

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