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Quote:
Originally Posted by mtrycraft
All the DBT are with music. Threshold detect is by the most sensitive signals. That excludes music by default. But I thought you knew all this.
Really. The recent link to the Harman International labs used tones in their speaker DBTs. What I am really referring to in the context of cables is measurements based upon dynamic content.
Quote:
Originally Posted by mtrycraft
Yes, I know about Mati and the sound of caps too. Please cite his paper you are referring to.
Otala, M.: Transient distortion in transistorised audio power amplifiers. IEEE Trans. AU-18 no.3, 1970
Quote:
Originally Posted by mtrycraft
Oh, he is a credible source to be contended with. This is not 20 years old wishfull thinking.
Ok. Self likes class B amps. What is the significance of the link?
As to my having "no idea of digital audio history in the real world", what exactly was your point?
rw
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I mever nake mistakes.
:)
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Hi E-Stat,
Quote:
Originally Posted by E-Stat
All of those tests involving complex and dynamic waveforms have seemed to slip my mind. Please enlighten me.
I'm not sure if that is a serious question or if you're just picking at Mtrycraft, but it's a legitimate question, so I'll respond.
There is a long list of tests that use complex and dynamic waveforms. Commonly used waveforms include square waves, triangular waves, saw-tooth waves, white noise, pink noise, and all manner of MLS. MLS is cool because it is not only complex like real world signals, but also because it is deterministic. This lets us do all sorts of neat stuff, like plotting the real and complex transfer function of the device under test in both the time or frequency domain.
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Proponents of audiophile cables maintain that traditional tests cannot demonstrate the kinds of distortions that these cables reduce or eliminate but that they are audible. The do not produce DBTs to show that anyone can demonstrate that they are audible in any fair test. The least that they can do is invent an electrical test, any test to demonstrate that the waveforms delivered are more faithful. Square waves, Triangular waves and other periodic waveforms have not demonstrated this. So what will. If such tests have been performed, please specify where the reports of them can be found. I've never seen one.
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Quote:
Originally Posted by Chuck
There is a long list of tests that use complex and dynamic waveforms.
Perhaps I should have been more explicit. I have yet to see any discussion wherein those kinds of tests were applied to cables.
rw
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Quote:
Originally Posted by E-Stat
Perhaps I should have been more explicit. I have yet to see any discussion wherein those kinds of tests were applied to cables.
Oh, that's different. :) I get the impression that most of the people who post here have never done any kind of testing. Mostly I see people discussing tests run by others. In most cases the people discussing the test results probably don't have any idea what kind of tests were used to compile the data. MLS is almost a de facto standard in the audio industry, so you've probably seen many MLS measurements without realizing it. It has been used to measure cables quite often and the results are consistent with other test methods. If they weren't, MLS would be suspect.
When a cable or interconnect makes an audible difference it is always do to something that makes sense, never magic, and differences that can be heard can always be measured. The proof that we can measure far more than we can hear is found in the fact that we can measure so many things that we absolutely cannot hear under any circumstances.
This is not to say that every possibility has been examined, but just that the guys who will tell you that we don't test with complex waveforms or in the time (or frequency) domain are misinformed, or in those cases where they actually know better, they are lying. It's a lie that's been told so many times that lots of people now believe it. Perhaps all that misinformation was the real source of your question? If so I guess all I can say is that the information came from unreliable sources. There are plenty of them around. :)
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Quote:
Originally Posted by E-Stat
What is the significance of the link?rw
If that is over your head, then it is waste of time to explain it. But I wonder why TIM was not mentioned?
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Quote:
Originally Posted by mtrycraft
But I wonder why TIM was not mentioned?
Lack of intended scope for article, lack of space, lack of understanding, lack of interest, lack of desire to discuss that which he did not discover, etc.
You pick the answer. Where do you buy a Self class "B" amplifier?
rw
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