Ralph, I read your posts several times. You didn't describe a test you're willing to take. Rather, you wasted several paragraph explaining why it's impossible to devise such a test: Your cassette deck needs new rollers, a special platform must be constructed, and - most incredible of all - you can't demonstrate digital aliasing on a digital system. :->) What a waste of both your time and mine this has been.
Your belief that distortion is different from "artifacts" and so can be heard at infinitesimally small levels is preposterous. I challenge you to prove it. Hint: you can't because it's not true. And your other belief, that distortion "brightness" is different from frequency response brightness, is equally preposterous. If you change the spectrum, how and why it changed is irrelevant. If you add 10 percent 3rd harmonic distortion to a 1 KHz triangle wave, that's exactly the same as boosting an EQ by about 1 dB at 3 KHz.
Again this is such basic stuff that I now have my answer: You do know that what you're claiming is nonsense, but you do it anyway to sell stuff. So I'm pretty well done here, though I still look forward to your proof that distortion is always audible even when it's 80+ dB below the music.
Your belief that distortion is different from "artifacts" and so can be heard at infinitesimally small levels is preposterous. I challenge you to prove it. Hint: you can't because it's not true. And your other belief, that distortion "brightness" is different from frequency response brightness, is equally preposterous. If you change the spectrum, how and why it changed is irrelevant. If you add 10 percent 3rd harmonic distortion to a 1 KHz triangle wave, that's exactly the same as boosting an EQ by about 1 dB at 3 KHz.
Again this is such basic stuff that I now have my answer: You do know that what you're claiming is nonsense, but you do it anyway to sell stuff. So I'm pretty well done here, though I still look forward to your proof that distortion is always audible even when it's 80+ dB below the music.