The AC power that comes into your home travels great distances and there are hundreds if not thousands of feet in branch circuits throughout your home.
What country is n/a?
My power comes from the step down pad mount isolation transformer located on the property next door.
The two 120V 20amp dedicated branch circuits that feed my audio equipment are no where near hundreds let alone thousands of feet long. You must really live in a big house.
A power cord is not the last 3 to 6 feet of wire that feeds the power transformer of a piece of audio equipment. It is an extension of the leads of the primary winding of the power transformer.