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Hmmm ways to measure everything except.......cables, power cords and magic bowls of course?
For that, see the report of the research from Nordost and Vertex EQ that appears earlier in this blog. The effects of cables, power cords, and equipment supports on time domain errors can be measured. The means to do so will be available to consumers, hopefully in a year's time. Equally measurable are the effects of room treatment, including the ART system. And, as Jonathan Novick declared, paraphrasing a not-so-shabby scientist named Einstein, "Not all that matters can be measured. Not all that can be measured, matters!.End.
Nordost have shown that with a million bucks of RF lab you can measure time domain aberrations that lie significantly below the threshold for audibility.They have shown this for multiple modifications to a hifi including power conditioning and support for electromechanical components. They haven't shown cables alone to make measurable differences, and they have not taken the time to prove any audibility of the changes that were measured.
I regret appearing so unlearned, but I had to research that paraphrased Einstein quote. The real one is "Everything that can be counted does not necessarily count; everything that counts cannot necessarily be counted", and I LOVE it. TYVM, Mr. Atkinson. And the Measurists I speak of are NOT those who use measurements AND their ears to design and/or evaluate equipment but those who believe that if a difference cannot be measured, it doesn't exist. That, IMO, is arrogance supreme.