Bliz, I have never heard of a test that measures caps and resistors and coils for distortion or any other parameter that would affect sound. Please post a link to such tests. I do believe they all sound different and different ones have lower inductance, dielectric absorption and ESR.....but these things have never been proven to make a quantifiable sonic difference. Two caps might both have the same low ESR but sound way different. In fact, I have found some of the low ERS caps to sound inferior. What measurements are you talking about?
By the Way, the outside foil of a foil cap when positioned so its to ground or output sounds best. Coils sound best when you enter into the center of the coil and exit the outside. These things are not measureable. All wire is directional.....it will sound better one way or the other....again not measureable.
This is the best info I have. However I was reading about other measurement techniques somewhere before. Everything is probably measurable, if we had the equipment to measure it, and knew what to measure for.
http://www.humblehomemadehifi.com/download/ClarityCap_Technical_Report.pdf
Here's Lukasz's take on cap differences:
http://lampizator.eu/UPGRADE/CAPACITORS/capacitors.html
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