The modern home is littered with stray magnetic fields, RF, EMI as well as mains and appliance generated noise that finds its way into our power supply and hence our HiFi System. This “Noise” corrupts and destroys the integrity of delicate musical signals.
For this reason the Power Cable is the most important in the jungle of cables as errors here can not be compensated for elsewhere in the system and in any case, two wrongs don’t make a right.