SY said:
We can discuss about frequency response and phase issues until the cows come home, without describing them as distortions. Otherwise, you may think about filters introducing linear distortions.
scott wurcer said:
Well, if one defines distortion as "deviation of the transfer function from a scalar," then why not? It's all semantics.
What is ironic is that Scott Wurcer was predominant in exposing 'linear distortion' when I was just a neophyte on the subject. I must publish Scott's very own computer simulation of the DA difference test that he did about 25 years ago. OK, Scott?
Whatever causes whatever distortion how much does it affect audio quality? Some sort of scale would be useful.
I don't think that we can talk about many occasions of quantifiable distortion when comparing state of the art circuits & parts. They mainly measure beyond reproach. The question should be about ''presentation''. Why do they present music differently to the senses of even proven engineers like John Curl (not exactly our next door gullible hobbyist)? Can we measure it via beaten path science? Seems like our guns are empty considering the presentation irregularity.
A TRUE differential test will show it, immediately. However, most differential tests are compromised to miss this difference.
Maybe there is something buried in impulse response details, considering different presentations when subjectively comparing excellent parts?
We have measured significant deviations from what we would expect from a single ideal capacitor up to 10%. Is this hi fi?
You measured against a straight wire? Was is a differential test for residual differences? Or spectral THD and IMD tests?
Define ideal in the example capacitor you used.
Define ideal in the example capacitor you used.
I don't want to know all the story, but you are so laconic that I am trying to understand what you meant. Hence the clarification repetitive questions. OK, one shot:
By differential tests not adequate to resolve some issues, you mean ABX subjective tests, right?
By ideal you mean textbook, not current best construction, yes?
P.S. Although you may have explained that in the past, and I may well have read it, this thread is so vast I can't be sure what you are referring to. Sometimes your answers are like short riddles. You may not answer if you are not in the mood. Cheers.
By differential tests not adequate to resolve some issues, you mean ABX subjective tests, right?
By ideal you mean textbook, not current best construction, yes?
P.S. Although you may have explained that in the past, and I may well have read it, this thread is so vast I can't be sure what you are referring to. Sometimes your answers are like short riddles. You may not answer if you are not in the mood. Cheers.
Walt Jung is a great resource. I was wondering if you implied some clever new way of yours to actually measure parts that explain more about their implications on musical presentation, in some differential comparison test. You probably meant measuring against textbook ideal caps and finding 10% deviations. OK. Thanks.
john curl said:
Yes.You're right.
Real & scientific/objective facts about audio capacitors,
Walt Jung knows it best:
Walt Jung - the audio legend - Articles & Papers for us
Regards
Lineup 🙂 Audio Links for You
john curl said:
John the disagreement is around an important distinction. If you remember I also objected to Walt refering to DA as "memory". Some might just think it's semantics but these things lead to some very fuzzy thinking. In fact people almost immediately likened DA to unwanted room "echos" where Pease clearly showed how to decompose a capacitor into a mesh of R's and C's. I showed that our null measurement could be used to fit Pease's model, but that got lost at the time.
YES you can find capacitors that have real harmonic distortion but in the majority of serious dielectrics it is vanishingly small.
Memory? Just short out a brand new 200V electrolytic cap with a screwdriver, if it has not been shorted before. Where did the energy come from?
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