@russ69 how many times will you and others repeat this lie? It does not suddenly become true just because you repeat it.
They have one mantra: If it's not measured, it's BS. Totally ignoring the scientific area of observation.
I see @cd318 also called you on this. Maybe it will sink it.
Speaking for myself, I cannot accept the first statement because “make sense at an engineering level” is too limited. I firmly believe our current state of knowledge cannot fully describe the sound quality that will result from a given system/room.
If a power conditioner has no effect on the output, or a USB cable has no effect on the output as Amir had shown in tests, then how could the sound of the system / room possibly change? If you refute the accuracy of Amirs tests, do you have any basis for that?
I see your post and many here either anti science or anti authority. I am not sure which. A comment was made that people here are people of means. People of means often have issues with people in positions of authority putting limits on them. Amir is effectively in a position of authority and is putting virtual limits on what audiophiles can claim without repercussion. Maybe that is what mosy irks many of the posters here