Jon Risch distortion test signal

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Bruce, I will use a very simple and straight-forward example, perhaps this will register.

My, my, look how quickly the ad hominem attacks begin. hardly out of the first paragraph.

Actually, they do change with frequency in audio devices, that is exacty what I have been trying to tell you! It is very common for audio devices to have a lower level of HD in the midband, and then have much higher levels at the frequency extremes, say at 100 Hz and at 10 kHz. There are thermal considerations, biasing and operating points that changes with level and frequency, etc. so you CAN NOT make the same kind of prediction that you can with RF amps. This is not someting that any audio engineer or tech would need citations or references for, it is common knowledge, but if one really were that much in the dark, all you would ahve to do is look at some of the Stereophile test reports that are available online, and see that HD levels change with frequency.

That has nothing to do with the basic physics involved. The products are still there as predicted.

My Phi Spectral test signal is not unusable to measure HD or IM,

It is completely unusable to make meaningful measurements. As you said, it would take a massive spredsheet to sort out all the possible combinations especially when you include multiple order products. The results would be indistinguishable from noise.

in fact, it is superior to the classic one tone HD and two tone IM tests, in that it streses the DUT with multiple tones, more like real music.

That's what we have pink noise for. Again, a world-wide recognized standard.

The rest I have already covered.

-Bruce