Future of cables!

@djones51  You quoted from Wikipedia without understanding.  Energy is delivered on the outside of the cable, but in case of coaxial cable it is limited to space inside.  In coaxial cable whole energy flows thru dielectric between inner wire and the shield.   Also, picture in Wikipedia shows how this energy flux gets to load.  

djones51, I found very nice primer that explains step by step:

https://www.researchgate.net/publication/255626544_Understanding_Electricity_and_Circuits_What_the_Text_Books_Don't_Tell_You

You're right, It should be "outside of wire" (and not cable) or "in the space between wires".  There is only magnetic and no electric field on the outside of the cable, so energy flux cannot be created there.

You still haven’t explained why is it necessary to connect the copper or banana plug or whatever we use to the speaker since the cable doesn’t carry the energy but it’s carried outside the cable.

Without this connection there will be no electric current, hence no magnetic field.  It is necessary to have both magnetic and electric field to create energy flux.

djones51,  energy flux follows the wire inside of the speaker until there is a voltage drop - then power is absorbed (look at the wikipedia picture).  Wire itself has some resistance, so part of energy flux is absorbed by the wire (power loss - read "Resistive Dissipation" chapter).  I know it sounds strange, but energy delivered by the current would be even stranger, since exactly the same current (electric charge) comes back to the source.

Knot would introduce inductance for common mode signal and no inductance for normal mode (common mode choke), but I doubt that one turn would make any difference.   I would rather put as many turns as possible on large toroidal ferrite core (with high permeability).  IMHO it is waste of time and effort if you don't have noisy power.  On the other hand there is nothing wrong with "placebo effect" if it makes you feel better .  At least it doesn't cost a lot in comparison to other "improvements".

Bigkidz, AFAIK toroidal transformers have very little magnetic flux  leakage and perhaps are quieter under normal conditions, but lack of core gap makes them more sensitive to DC in mains, that can produce noise or even saturation.

It is interesting article, but I'm not sure how it applies to audio cables.  Electric current is a flow of electric charge.  For AC signals electrons practically stand in place while electric charge moves at about 2/3 of the speed of light.  Energy is delivered to speaker by electromagnetic field outside of the cable.  

tochsii, The same amount of electric charge that flows to the speaker returns back to the amplifier. What is energy source then and why this energy flows always toward speaker even with direction changing AC current. It is because energy is delivered on the outside of the wire. This energy corresponds to flow of electric charge, so everything that happens in the wire affects electromagnetic field. Anytime you have electric field you also have magnetic field and vice versa. They always go in pair and affect each other. That’s why dielectric, that is on the outside of the wire, affect speed of the electric current inside of the wire.

To understand why energy is delivered only from source to load, even with AC current, imagine battery (source), two wires and resistor (load). Presence of resistor introduces electric field (voltage drop) from + to - wire, while current flow introduces magnetic field clockwise in direction of the current (right hand rule). Electric and magnetic fields are perpendicular, like X and Y axis while energy flow is perpendicular to both of them like axis Z. This is Poynting Vector showing direction of energy flow. When current changes direction both electric and magnetic fields also change direction causing Poynting vector to keep the same direction. Look at the drawing of the battery and resistor here:

https://en.wikipedia.org/wiki/Poynting_vector

djones51, perhaps you should read my last post.