Good post @ozzy. A lot of the ASR folk state (with apparent absolute authority) that if you can’t measure it, you can’t hear it. I’d like to know approximately which year this started.
Was it true a hundred or two hundred years ago? In 1924, we had some very good tube amplifiers, not just for audio, but also long distance telephone and radio. Just how good was the test equipment back them? Sure they could measure distortion at a single frequency, up to a point. They also had wave analyzers (forerunner to spectrum analyzers and VNA). But really nothing super sophisticated. And yet engineers were able to design and build some very good quality amplification. My guess is that a lot of this was done by ear.
Therefore, at some point in our history there was a crossover? What year were measurements finally better than hearing?
Come on ASR people, when was it?