Only if your knowledge is limited and you have to fall back on guessing and beliefs.
Did someone say "cable sound"?
Did someone say "cable sound"?
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I've always wondered why very few people talk about their measurements. Now who did measurements?
Mee too. Instead I'm advised to search through threads of endless banter (why not just link relevant posts if they contain incontrovertible proof for cable sound claims?) or someone promises to send "proof" via email/PM (which never happens) or wants to discuss things "in private" (why? afraid of being proven wrong?) or promises to do double blind tests (which somehow never happen).
Ohm's law made all our electronic gadgets possible, so someone first needs to present real good facts to prove that something's wrong with the earth being not so flat.
You can either do a search or pm me, I can answer specific questions.
Or you can continue the path you take. This is your choice.
Are you able to discuss transmission line theory or derive useful content via Faraday's law of induction?
I can. And I have. And I tire of repeating myself over and over to those who really do not understand, but are ready with meaningless quips.
No kidding. Alas, that is but a subset of the physical laws required.
And I have presented facts. And equations, and results, and graphs.
But in presenting to you content such as this, will you understand? Did you understand what I stated about transmission line theory?
This is exactly why I have for the most part been silent on this forum... Armchair googlists who do not really understand physics.
Cheers, John
ps.. do not be so lazy. use the search feature. search "transmission line & jneutron", "posts"..
It will not take long.
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So why not just post it on the web and just link to it? That's what internet is for.
It's you that wants me to convince of something I don't exactly know what it is. Quite frankly I'm not curious enough to waste my time on finding out what it would be.
He is pretty deep into it by page 5 of this thread. I am not going to link to every post for you. Maybe someone will look everything up and read it to you.
Markus, there are very, very few people whom I would take seriously when they tell me to "just look it up yourself." jneutron is one of them. I'd look it up.
Here's some interesting stuff for you Markus, and it's only six pages.
Amplifier and Speaker Cable Incompatability
Dan
Amplifier and Speaker Cable Incompatability
Dan
In another thread here John Curl defended his decision not to use output inductors in his amps. The above seems to show some occasions where it came back to bite the owner.
jd
"We all know cables make a measurable difference. You only have to change the length by a foot.
The argument is about whether cables with effectively the same LCR, and engineered to meet the basic engineering requirements of the application, sound different.
The answer to the argument is NO.
But this contravenes sighted personal impressions, which the average person chooses not to distinguish from reality, and so they cannot 'let go' and accept that their sighted impressions are effectively delusions.
They then got on discussion boards and try to make everyone reinvent the wheel because they weren't personally there when the wheel was invented. This usually culminates in "please help me to set up blind listening tests that I can personally conduct at home and then I can tell you all the truth (which I secretly hope will endorse my sighted impressions)".
People who can accept that properly engineered and applied cables leave no audible trace don't get involved in all the above hanky panky and focus their time on genuinely audible factors like speakers, room and LP players."
I'm with you Markus. I posted the above over 5000 posts ago (!!!), in November, and left this thread for more fruitful pursuits. I just now dropped into diyaudio and was amazed to see it has still not died, seemingly refuses to die. This is my 56th post in this thread, and my aim has not been to win the arguments, I am instead concerned that newcomers to audio will drop in and see that the cablophiles have won by the 'last man standing' argument, and they will walk away believing that properly engineered and applied cables are audible because senior audiophiles say so and have endless logical-sounding arguments to put on the table. So I thought to reproduce my post #7844, directed to any newbies who may be drawn into this thread by its interesting title. 😎
Thanks Dan but once again, all I can derive from that discussion is that there are topics in audio that are a magnitude more relevant to accurate sound reproduction than cables and appropriate theories to model their behavior: the loudspeaker-room system.
Best, Markus
I have found in my life experience that 2uH output inductors cause an audible change in output sound quality. I used output inductors for several decades, starting at 1970 to 1990. The JC-3 had an output conductor, for example, as did the Gale, Symmetry, and VMPS custom power amps. However, by 1990, output transistors had increased in F(t) by a factor of about 10 times, and it was found that output inductors were not as 'necessary' as previously, and as I heard an audible difference in a test presented to me, I decided to not use an output coil in future products.
This created a slight compromise in slew rate, reducing it from 500V/us or so to perhaps 100 V/us, but that was fast enough.
The primary way to test for stability is to use a capacitance substitution box as a load and drive the amplifier with a moderate level square wave. Looking at an oscilloscope and changing the effective load capacitance of the power amplifier until you note excessive ringing. Then, carefully modify the capacitance just a little to see if you can actually get the amp to oscillate with one SPECIFIC capacitance. If you can't, then continue to increase the capacitive load, and generally the ringing will diminish. If this test is passed, the amp is essentially stable.
Can a load be found that will violate the previous statement and make the amp oscillate? Perhaps, but we cannot prepare, without compromising the sound, for every contingency. That is a trade off. However, IF you have a problem, especially with a specific audio cable that you like, in any case, then just add some inductance by winding some varnish covered 'magnet wire' around a form about the size of a lipstick tube, perhaps 10 turns and add it in series with the output of the amp to protect it. It would probably be best to add a 10 ohm resistor in parallel with the output coil you just made, to damp the coil's natural ringing, just to be on the safe side.
To show that anything can happen in the real world, Jan Lohstroh's so called 'Otala' amp would SING at 2K Hz when loaded with my WATT 1 speakers. I had to insert a .5 ohm resistor in series to stop the 'tone' that continuously came forth, without it. That amp has an output conductor, but this was a slightly different loading than it was designed for.
This created a slight compromise in slew rate, reducing it from 500V/us or so to perhaps 100 V/us, but that was fast enough.
The primary way to test for stability is to use a capacitance substitution box as a load and drive the amplifier with a moderate level square wave. Looking at an oscilloscope and changing the effective load capacitance of the power amplifier until you note excessive ringing. Then, carefully modify the capacitance just a little to see if you can actually get the amp to oscillate with one SPECIFIC capacitance. If you can't, then continue to increase the capacitive load, and generally the ringing will diminish. If this test is passed, the amp is essentially stable.
Can a load be found that will violate the previous statement and make the amp oscillate? Perhaps, but we cannot prepare, without compromising the sound, for every contingency. That is a trade off. However, IF you have a problem, especially with a specific audio cable that you like, in any case, then just add some inductance by winding some varnish covered 'magnet wire' around a form about the size of a lipstick tube, perhaps 10 turns and add it in series with the output of the amp to protect it. It would probably be best to add a 10 ohm resistor in parallel with the output coil you just made, to damp the coil's natural ringing, just to be on the safe side.
To show that anything can happen in the real world, Jan Lohstroh's so called 'Otala' amp would SING at 2K Hz when loaded with my WATT 1 speakers. I had to insert a .5 ohm resistor in series to stop the 'tone' that continuously came forth, without it. That amp has an output conductor, but this was a slightly different loading than it was designed for.
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