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RE: "But that a listening session is also part of the test suite"

I think I did say exactly that!

"And if the listening test fails, then the engineering really doesn't matter." [Gusser]

And I never said everyone hears the same! Who ever did?

But you need to consider we don't hear only with our ears. We hear with our brains. And that brain is highly subject to other influences. This is well proven.

Placebo effect, expectation bias is very real. That's why we have DBT. Now some claim DBT is not perfect either and perhaps it's not. But it's certainly more reliable than listening tests where all the parameters are fully disclosed before hand.

You build tube amps. Tube amps are simple circuits and very wide tolerance. Now can you build a state of the art DC coupled SS amp just from part data sheets. No schematic to follow, just data sheets. Try to do that without resorting to math and EE principles!

As for the 70s and 80s, what about the SS amps of the 60s? And we still have bad audio products today. Point is every decade had good and bad audio components. I still use Haflers of the early 80s. These were good amps. Not everything back then was junk.

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