You raise some good points in your post, but about this…
So-called euphonic distortions always fail the common-sense “I wish the live instruments had some more of those euphonic distortions added” test. Come off it.
Musicians are often adding euphonic distortions. What do you think guitarist are doing when playing with all sorts of guitar tones, tube amps, distortion modellers, reverbs, etc?
Even a muted trumpet is a type of euphonic distortion.
I’m adding euphonic distortions all the time in my work.
But the above quoted statement about trying to improve on live instruments misses the general point about euphonic distortion added in the reproduction point.
But you get at it here:
. Even where a carefully controlled listening experiment were to show this preference for vinyl/tube errors added to clean recordings, there is bound to be something else unlikable in the recording, mixing, mastering, speakers, room or calibration used for the test, that the addition of vinyl/tube errors happens to be masking,
Yes, that’s more to the point. One way we can prefer euphonic distortion is that it makes a recording “sound better” (to an individual) - whether it’s tubes, EQ or whatever.
If we’re talking about the euphony of live instruments as a reference: it’s my view that most recordings of instruments and voices, along with the nature of most sound systems, impose an artificiality. Recordings of a trumpet, acoustic guitar, or what have you, tend to be less harmonically Rich sounding, And tend to sound squeezed, tight, more mechanical sounding, less body and less of the organic quality of the real thing. These are, of course, just generalizations of my own subjective impressions. But I have cared about listening to real instruments And judging them against reproduce sound from many years, and I’ve also done my own live instrument versus reproduced tests, which have helped form these impressions. Just the nature of recording reproduction, mixing etc. tends to yield such results (as well as the liabilities of the reproduction system - stereo yielding a more ghostly sense of sonic images than the real thing).
To that end, at least in principle, Some euphonic distortion could aid somebody’s perception of hearing something a little bit more like the real thing if that is their goal.
That has been my own perception of what my tube amps bring to my system. Subtle alterations that remind me more of some of the characteristics I like in live musical sounds.
I’m talking in principal, so you don’t need to accept my anecdotal claims.
That said..,,
Until people making these claims convincingly demonstrate that they have controlled their personal listening tests for non-sonic biases, those very biases will remain the go-to explanation for their claims.
At least in the case of my tube preamp, my blind testing seemed to support my sighted impressions.
(And some ASR members in my blind test thread pointed out that stereophile measurements of my preamp, supported the plausibility of my test results)
Cheers