A ferrite layer around a cable works as a distributed common mode choke. Theoretically a common mode choke does not influence differential current flow at all. In reality nothing is ideal, so some differential inductance is to be expected. And yes, all ferrites are somehow non-linear. But considering the tiny common mode inductance, the even tiny² differential-mode conductance - the resulting distortions are neglible. And we are talking of tiny distortions of mains supply current, not audio signals. So, where is your point?
You have evidence that resulting noise/distortion, for both conducted and radiated EMI/RFI are "negligible?"
Also, isn't "negligible" pretty much what people assumed about class-D amplifier output inductors, before it it was found they can be non-negligible?
Annealing is a heating and slow cooling process - involving temperatures in the 1500 to 2000 degree F range! You may be confusing it with demagnetization, which can be done by driving the transformer with very high-level, low-frequency tone or program signal. "Breakthrough" is certainly a tired and overworked word in audio technology - ancient knowledge is "re-invented" every day by those unaware of the past.
You're right. Bad choice of words.
Regarding breakthroughs, its also true that a lot of stuff gets forgotten or is sometimes missed in possibly obscure literature. However, if you were tasked with making a significantly better sounding transformer than you ever made before (not to create an effect, rather one which is more transparent than you have now), one that must satisfy subjective requirements of an expert audio designer, would it be a piece of cake?
Yes, I do. Otherwise it is on your side to prove that the described tiny² distortion of MAINS current - not of audio signal - has any relevance for the audio signal.
Okay. Let's see your evidence.
BTW, I didn't claim it affects "the" audio signal. It may or may not affect some audio signal somewhere depending on specific details. I only claim you don't have scientific evidence that its negligible. Most likely you are just arm waving.
https://en.wikipedia.org/wiki/Hand-waving#:~:text=Hand-waving (with various spellings,doing nothing effective or substantial.
BTW, I didn't claim it affects "the" audio signal. It may or may not affect some audio signal somewhere depending on specific details. I only claim you don't have scientific evidence that its negligible. Most likely you are just arm waving.
https://en.wikipedia.org/wiki/Hand-waving#:~:text=Hand-waving (with various spellings,doing nothing effective or substantial.
The effects may be negligible, but as my buddy Barry says: two negligibles make a noticable and three make a significant.
Over the years I have learned that the only way to get the best out of a system is to tend to all sorts of minor details, many of which individually are probably undetectable but together add up to the last little bit of performance.
Pete
Over the years I have learned that the only way to get the best out of a system is to tend to all sorts of minor details, many of which individually are probably undetectable but together add up to the last little bit of performance.
Pete
Hi,
well, and +2 and -2 add up to ?
Since the superposition principle applies, two negligibles might easily add up to nil, or even become negative negligible.
What's Your buddy thinking on this?
Why should it be that a change of debatable dimension of an effect always improves matters, and more so, multiple different tiny changes make a multiple tiny times improvement?
I certainly can't follow this reasoning ... way above my engineer's logic.
jauu
Calvin
well, and +2 and -2 add up to ?
Since the superposition principle applies, two negligibles might easily add up to nil, or even become negative negligible.
What's Your buddy thinking on this?
Why should it be that a change of debatable dimension of an effect always improves matters, and more so, multiple different tiny changes make a multiple tiny times improvement?
I certainly can't follow this reasoning ... way above my engineer's logic.
jauu
Calvin
In my experience consumer electonics are among the worst power line noise generators. Most are built to meet and not exceed the minimum requirements (cost down). I'm not sure if much of the high end audio stuff has even been checked for conducted radiation. A shielded and ferrite filtered cable could make a significant improvement.
Despite my serious efforts I have not heard a downside with ferrites, at least when used correctly. However a too small ferrite on the output of a switching amp will be a real distorter. Magnetics are much more complex than capacitor dielectrics and what you can do with them can be quite amazing.
Despite my serious efforts I have not heard a downside with ferrites, at least when used correctly. However a too small ferrite on the output of a switching amp will be a real distorter. Magnetics are much more complex than capacitor dielectrics and what you can do with them can be quite amazing.
Does it?
^^^Okay, this is a good point. IME many or most trial changes tend to be for the worse. However, most changes in line with what Mr. CMRR suggests tend to be helpful, especially if added up.
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I'd think the eupen cable helps attenuate any rf/emi before it enter the metal chassis where it most likely going to be harder do deal with
the ac mains is going through a lowpass filter (transformer hopefully with interwinding screen) then rectified and another filter section (psu filter caps), maybe even some chokes, this should minimise any nonlnear ferrite effects....
Is the 56/60Hz also acting as sorta kinda type of dither/tape bias?
the ac mains is going through a lowpass filter (transformer hopefully with interwinding screen) then rectified and another filter section (psu filter caps), maybe even some chokes, this should minimise any nonlnear ferrite effects....
Is the 56/60Hz also acting as sorta kinda type of dither/tape bias?
The power cord is the main artery of the power supply. If you take a look at Nordost`s top-of-the-line powercords you`ll see that they consist of seven approximately 1mm massive conductors. Wery much the same as Electrocompaniet`s old legendary powercords, only they were a lot cheaper.
This confuguration outperforms any stranded wire by miles. But the do not have to be pricey at all, and they can be done even better. Take a 12awg shielded firealarm cable and mount it up. It will outperform any "exotic" pc, NO Valhalla included.
If you have to use extenders, make up one using the same cable. (+put in a simple hf-filter)
No, solidcore do not need 100hours to open up but "a bit massage". How many hours depenfs on the amount of power.
This confuguration outperforms any stranded wire by miles. But the do not have to be pricey at all, and they can be done even better. Take a 12awg shielded firealarm cable and mount it up. It will outperform any "exotic" pc, NO Valhalla included.
If you have to use extenders, make up one using the same cable. (+put in a simple hf-filter)
No, solidcore do not need 100hours to open up but "a bit massage". How many hours depenfs on the amount of power.
Do you have any evidence for your claim? Obviously not. So you discredit contributions you do not like.
That's interesting. Does Nordost use seven 1mm conductors for all of A,N & E, or seven for each? And in what ways does this outperform, say, a cable with 15-18 strands of copper for each?
Assuming similar copper cross sectional sizes, of course.
This "outperforming" was not verified in this test:
https://www.audiosciencereview.com/forum/index.php?threads/nordost-blue-heaven-ac-cord-review.45501/
https://www.audiosciencereview.com/forum/index.php?threads/nordost-blue-heaven-ac-cord-review.45501/
True. Could have been more exhaustive. Also, sometimes its possible to gain useful insight looking at a time-domain distortion residual rather than only a spray of frequencies.
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Things more or less like that are already made for audio use: https://www.psaudio.com/collections/power-regenerators