Interconnects, some have directional indicators, why?


I'm curious as to why some interconnects are directional? Is there a physical internal difference and do they generally sound better and cost more than non-directional cables? Thanks for your interest.
phd

Showing 18 responses by jea48

How do you square this with the cable carrying an AC signal?


//


https://forum.audiogon.com/discussions/directional-cables

herman                                             1,909 posts            05-17-2010 3:57pm


Arrows on all other kinds of cables -- XLR, speaker, power, and data -- are utterly meaningless from an electrical standpoint, since audio signals (and wall voltage) are alternating current and interact with conductors the same way in either direction.

This explanation, while common, ignores the fact that we are transferring energy in one direction. The oversimplified view that we have electrons flowing in one direction and then they all flow back the other direction so it all balances out works for some very simple electronic models but falls apart when trying to use it to explain transmission lines (cables).

I’m not arguing that a perfectly symmetrical cable is directional, only that the explanation used is not applicable to what is really happening.
[End of quote.]

.

The audio signal energy travels in one direction in the form of an electromagnetic wave from the source to the load.

If you accept this theory wire directionality can be better understood. It also explains how the type of dielectric used in ICs and speaker cables can have an impact on how the cable sounds in an audio system. Can people hear differences in cables? Use the AC theory of the signal traveling back and forth to explain how, why, cables sound different.


Read:

"Ralf Morrison's website has some comments on electromagnetic laws."

https://books.google.com/books?id=9tsbThJYMh0C&pg=PA5&lpg=PA5&dq=moving+electrical+energ...

georgelofi said:
Yes differences in dielectric, the way the different insulated conductors are wound/twisted together.
But not in the direction of the copper wire itself, as was stated!!


    George what proof do you have of your claim the wire cannot be directional? Any actual experimentation building speaker wires or  ICs?



    Quote:

    In Reply to: Re: maybe rcrump... I don’t know, but... posted by Greg R. on September 29, 2000 at 19:47:48:

Solid core wire is extremely directional so just mark the end with some masking tape as it comes off the spool. Orient the wires so you have piece of masking tape at either end and terminate the wires. Throw it on a MOBIE or whatever overnight and then listen to it noting which way gives the highest image height. This is the correct orientation.

If you run the signal and return wires in the same direction you will end up with hot spots in the stage, normally at or close to the speakers, low image height and have a gaping hole in the middle of the stage...Keep in mind I am referring to the sound of the stage (reflections) not the individual instruments spread across the stage....Interconnects or speaker wires that have pianos wandering all over the stage normally have their signal and return going in the same direction....

http://db.audioasylum.com/cgi/m.mpl?forum=cables&n=12372&highlight=rcrump+wire+direction

.
So, this begs the question: will the sound improve if the amplifier is placed lower than the source components so the electrons could travel more freely down hill following the direction in the cable? This might explain why most serious audiophiles put their amplifiers on the lowest shelf on the rack. Just wondering...

If you wait for the electrons to carry the signal to the amp from the source there is a good chance you would have time to shower, shave, and have a cup of coffee before you would hear a single note through your speakers.

The audio signal travels down the wire in the form of an electromagnetic wave from the source to the load.

The word electricity refers generally to the movement of electrons (or other charge carriers) through a conductor in the presence of potential and an electric field. The speed of this flow has multiple meanings. In everyday electrical and electronic devices, the signals or energy travel as electromagnetic waves typically on the order of 50%–99% of the speed of light, while the electrons themselves move (drift) much more slowly.
https://en.wikipedia.org/wiki/Speed_of_electricity

More for you to read.
 http://science.uniserve.edu.au/school/curric/stage6/phys/stw2002/sefton.pdf

jetter said:

Repeat of a question I asked above (simplified).

For single ended interconnects that do not have directional arrows, how can you determine at which end the the shield is connected?

Or if the shield is connected at both ends or neither?

Take apart the plastic covering at the end of the interconnect?

Thanks,

If the end is molded plastic, not sure how you could check. You might ask the manufacture how the cable is made up.

As a rule if arrows are not on the ICs the printed labeling on the cable is used for direction. Direction is with the wording on the cable from source to load.

Just make sure the lettering is running in the same direction for both the L&R channel ICs. Listen to them closely in one direction and then flip them both and listen to them again in the other direction. IF YOU can hear a difference pick the direction that sounds the best to you.

For listening material use music with a strong solo female voice. Instruments, I find a solo playing of a piano works good.

IF the ICs are made from stranded wire I doubt you will hear a difference, though you might.

Solid core wire ICs is easier to hear for differences. Especially silver soild core ICs.


Kijanki,

Thanks for the response.
I had already read about the Poynting vector  after you posted about it on another thread last week. I supplied the link for others reading your previous post.
Jim 
georgelofi ,

Your post,
Just look at his website, then you’ll understand, why he can’t
"see the forest through the trees."
http://www.machinadynamica.com/index.html
And he wants money for some of these bizzare things
has corrupted the Agon page 2 of this thread making the page difficult to read.

Please delete the post and re post the post without the last website link, or find another to post in its' place.

Thank you.
AL, (almarg)

I am guilty of saying "current flows" in an AC circuit when answering questions

regarding power branch circuits on audio forums. After reading Herman’s

responses in this thread,
https://forum.audiogon.com/discussions/directional-cables ,

I learned AC current does not flow back and forth in an AC circuit. I spent many

hours on the net trying to prove him wrong only to find Herman is correct.

For the purpose of this thread, regarding an audio signal applied to a wire cable,

AC current flow in the cable just doesn’t hold water.

IF, what is actually happening with the audio signal is that energy travels from the

source to the load, (in one direction >>>), in the form of an electromagnetic wave, in

my opinion, it then makes it easier to understand how cables can/could be directional.

(Sorry for the double space. It was the only way to make the post easier to read.)
Jim

mihorn,

Here is a response, from herman, to a post of mine to him.


If you say the AC fuse blew because there was too much current flowing

through it everybody nods in agreement even though that isn’t true. If you

say the wire in the fuse melted because it got too hot after absorbing

energy from the electromagnetic wave people look at you like you are

insane and want to argue that vibrating electrons constitute current flow.


( Again doubled spaced for ease to read the quote)

mihorn,

My post was in response to this part of your post;

That includes fuses in > 30~40 years old vintage gears. Switching the direction of the fuse, the electrical current takes longer time (and subtle) to hear the effect because many active parts have to react to the change of new current (unlike audio signal). In my experience, it usually took 1~10 minutes to hear.

AC current is not flowing through the fuse. Energy is, in the form of an electromagnetic wave.

I think if you guys that have experimented with fuse direction, and can hear a difference, it is hard to justify if one believes AC current flows back and forth though the fuse. If that was the case then the fuse would have to act as a diode in one direction to hear a difference. What other reasoning can you use?

If you use the theory, energy travels through the fuse in the form of an electromagnetic wave from the source to the load, then the next question is how could reversing the fuse make a difference?


Here is what herman posted again:

If you say the AC fuse blew because there was too much current flowing

through it everybody nods in agreement even though that isn’t true. If you

say the wire in the fuse melted because it got too hot after absorbing

energy from the electromagnetic wave people look at you like you are

insane and want to argue that vibrating electrons constitute current flow.

The fuse is a weakest link. In a garden hose, only narrowest part of hose counts to pass the max water. A weakest link is very sensitive. What has happened in the weakest link is amplified huge later. A sound system is only as good as its weakest link.

You are still thinking current flows through the fuse. It does not. You cannot use the garden hose analogy when describing what goes on with the workings of a fuse. Weakest link? Yes, only because if more energy passes through the fuse than it is designed to handle it will melt the link and open the circuit. Does the fuse restrict/limit the amount of energy needed for the piece of equipment to operate as designed?  Good question..... My guess is no.

atmasphere said:

That energy cannot exist without the current flow. You are correct in that electromagnetism is always there but it can’t exist without current! This link might help sort things out for you:


Quote from Link below:

"Those of you who feel that many of the ideas are not mainstream should find a copy of “Standard Handbook for Electrical Engineers” by Donald G. Fink and H. Wayne Beaty.…there is a section entitled, “Electromagnetic Wave Propagation Phenomena.”

“The usually accepted view that the conductor current produces the magnetic field surrounding it must be displaced by the more appropriate one that the electromagnetic field surrounding the conductor produces, through a small drain on the energy supply, the current in the conductor. Although the value of the latter may be used in computing the transmitted energy, one should clearly recognize that physically this current produces only a loss and in no way has a direct part in the phenomenon of power transmission.”

“There it was, right in front of me in black and white! The current does not flow around a loop setting up a magnetic field as I had, along with countless other engineers, been taught in high school and university. It is the other way round. The electric current is but an artifact of a more fundamental entity.”
http://www.prosoundtraining.com/site/synaudcon-library/understanding-electricity-means-understanding...


Either way its a red herring and has nothing to do with directionality nor suggests a means for directionality.
I never said it did. I said AC current does not flow in a circuit. AC does not flow back and forth in a circuit.

“The usually accepted view that the conductor current produces the magnetic field surrounding it must be displaced by the more appropriate one that the electromagnetic field surrounding the conductor produces, through a small drain on the energy supply, the current in the conductor. Although the value of the latter may be used in computing the transmitted energy, one should clearly recognize that physically this current produces only a loss and in no way has a direct part in the phenomenon of power transmission.”

mihorn said:

I have copper rods instead of fuses in my few components. Copper rods in the correct direction always sound better.
I am an audiophile, not an electrical engineer.
What protection do you have in the event of an overload or ground fault event if the equipment is not fused?

The branch circuit breaker will not protect you equipment.
https://www.tdi.texas.gov/fire/documents/fmnec70papers.pdf
mihorn said:
 I wrote that here to show it can be tested and see the truth while you are guessing negatively.
Please show me one post of mine where I said fuses could not be directional. I do not have any opinion on fuse directionality, one way or the other. I have never personally experimented with fuses. Until proven otherwise I take others at their word they hear differences. As for bypassing the safety fuse in audio equipment I personally would never do that. Even if the piece of equipment sounded better.  I have seen the power of electricity several times in my life time. Never fear it, but you best respect it!

As for wire directionality, I have experimented and have found solid core wire is directional. Especially solid core silver wire. Why is it directional? Who really cares! Lots of theory out there. I just get bent out of shape when someone says the signal is AC and flows back and forth so how could wire possibly be directional.

 
.
kijanki said:                                                                  2-05-2016 8:37pm

Current in the wire is a flow of electric charge. Wire creates magnetic field but transports charges and not the energy. Energy is transferred thru magnetic field from the source to the load.
The load has some voltage drop in it, hence electric field. Together with magnetic field, this brings the energy in. Same way, the source generates voltage and, together with magnetic field, this brings the energy out.
Direction of electromagnetic energy flow is determined by the Poynting vector, E × H, and depends on both voltage polarity (through E) and current direction (through H).
As I understand it, even in DC circuit energy flows from source to load thru the space in direction of Poynting Vector.
https://en.wikipedia.org/wiki/Poynting_vector

Kijanki,

I have a question, off subject of this thread. I would appreciate hearing your thoughts.

What would the AC waveform of a 120V Branch circuit look like where the hot, neutral, and equipment grounding, conductors are all braided together and then installed inside a steel conduit? The branch circuit is less than 8ft long. The Conductors are #12, I believe stranded wire.

What impact would the 3 braided wires inside the conduit have on the electromagnetic wave traveling down the braided wires from the source to the load?

Could it have an impact on the power supply of a big power amp? (Boulder 3060 amp) Could it cause a comment like this, " but still has a layer of syrup over the presentation that shouldn’t be there and loose bass".
Thanks,
Jim
Al, (almarg),

Thanks for your response. I missed the line voltage for the amp is 240V. I went back and reread the post and sure enough the OP said it was 240V for the new amp as well.

Here is the thread. scroll down to bflowers first post on the thread.
 https://forum.audiogon.com/discussions/grounding-metal-outlet-boxes-and-isolated-ground-receptacles
If you would please post your thoughts on the thread.
Jim