Power cords get little love from perfectly rational people. Yet if power supplies make/break component sound; and if power cords activate said power supplies with the power utility company; then power cords are a direct extension of the power supplies they connect to and music signal becomes modulated power supply action. AC wires ought to be more important than the throwaway wires with molded plugs that came with your gear then. There's current delivery, pickup and transmission of noise from either end of the cord - from your AC wiring and with it,