Thanks for quoting me...
Sure cables can sound different. Crappy ones sound different from good ones. There is no magical synergy with a speaker or amp though. The cables purpose to to move the energy (voltage) from the amp to speaker. It's a simple job. Copper, silver, aluminum, any decent conducting metal can do it, but they due it differently. (I'm referring to cables that do not have "networks" on them because that is a different discussion completely)
Electrical energy is NOT in the cable. It is stored in the magnetic field around the cable. This is ampere's law. As the voltage is reversed the electrons move in the opposite direction with the field reversing.
"...while energy flows fast"
Energy does NOT move or flow. Energy cannot move it is just a scalar number (joule). It just exists. Power is a measurement of energy / time, like a watt is a Joule/second. We never say the flow of power it is just 10 watts just like energy.
Power (in watts) = Joules/Second
= (Joules/Coulomb) x (Coulomb/Second)
= volts x amps
= number of Watts
Energy is never gain or lost it is always preserved. Energy is never directional. Thermo 101
Electricity is directional (we usually say + to - but that is a different discussion).
So electricity/ electrons/ current moves back and forth on a AC circuit, and energy does not. How can a cable be directional when the energy is not in the cable and it doesn't move, but the electrons that do move back and forth equally prefer the direction of the cable? How do they know they direction of the cable?