Subjectophiles don't want to believe measurements, particularly THD measurements, but there is no good reason for this. (Of course, you can't just go by specs, which may be lies, but actual measurements at different power levels and frequencies, etc.)
Some of the rampant distrust of measurements began with audio engineers who did a lot of them. Matti Otala was a designer for Harman Kardon who designed the great Citation XX and many other good amplifiers. He determined that conventional THD measurements were incomplete, and a new kind of measurement was needed he called TIM, and the way to achieve TIM was by eliminating or reducing global feedback.
It has been determined that TIM is nothing unique, and especially that it does not require a particular kind of design (low global feedback) to achieve it. It has been proven many times over that high feedback amps can have vanishingly low TIM as well as other kinds of distortion, simply by being designed for low THD under all conditions.
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