Joc3021,
You are making the mistake of attributing properties to ordinary wires. It is the quality of AC power and the choice of components which determine whether a cable will make either a large or negligible difference.
Think about it;
Poorly designed power supply => Power cord makes a difference
Extremely Dirty AC power => Power cord makes a difference
Poorly matched impedances between components => IC's make a difference
Ground Loops due to poor grounding or leaky power supplies => IC's make a difference
Speaker load extremely low impedance and highly reactive => Speaker cable makes a difference
Amplifier Output Impedance extremely high => Speaker cable makes a difference.
Unstable Power Amplifier => Speaker cable makes a difference
Underpowered poorly designed outputs stage of the Preamp => Interconnect cable and length can make a difference
Jittery Digital signal poor jitter handling/rejection => Digital Interconnect and length makes a difference
If you follow the logic you will understand that any cable anywhere in your system can make a difference but it isn't a specific property to the bits of wire but really has much more to do with the setup and components themselves.
So exactly the same cable/power cord/IC can make no difference in one system and a huge difference in another...
You are making the mistake of attributing properties to ordinary wires. It is the quality of AC power and the choice of components which determine whether a cable will make either a large or negligible difference.
Think about it;
Poorly designed power supply => Power cord makes a difference
Extremely Dirty AC power => Power cord makes a difference
Poorly matched impedances between components => IC's make a difference
Ground Loops due to poor grounding or leaky power supplies => IC's make a difference
Speaker load extremely low impedance and highly reactive => Speaker cable makes a difference
Amplifier Output Impedance extremely high => Speaker cable makes a difference.
Unstable Power Amplifier => Speaker cable makes a difference
Underpowered poorly designed outputs stage of the Preamp => Interconnect cable and length can make a difference
Jittery Digital signal poor jitter handling/rejection => Digital Interconnect and length makes a difference
If you follow the logic you will understand that any cable anywhere in your system can make a difference but it isn't a specific property to the bits of wire but really has much more to do with the setup and components themselves.
So exactly the same cable/power cord/IC can make no difference in one system and a huge difference in another...