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I don't have to, that's almost surely more than good enough

My hunch is that even if all the sound and distortion were lumped at a single frequency, it would be inaudible at that level. That's what, 60 db down? Here's a DBT experiment for you to test actual sound acuity. Try a single test tone and add varying percentages of harmonics to it to determine at what level the threshold of audibility occurs for both single related harmonics, combinations of harmonics, and non harmonically related spurious sound such as white noise. Then you will know the threshold of audibility of IM, and of various distributions of harmonic distortion you can use as a design criteria for a recording/playback chain. Dr. Bose said in the 1970s for harmonically related sounds, it's 6%. Maybe he was wrong. So far all other discussion has been qualitative. Without setting parameters, you can claim anything and there is nothing to talk about. How convenient for those who want to spend the rest of their lives designing endless variants of equipment to perform the same function, there will never come a time when the performance is good enough to quit and say we have achieved our goal beyond the best performance necessary, the only further improvement possible is to make it cheaper and more reliable. I hope you take this challenge seriously as it would entail real research and provide those practicing the art with real knowledge that is of value. I regret that you have not taken up my suggestions of this kind of pursuit in the past. Good luck in teaching all of us something of real value.

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