It's a basic question that needs a basic answer. Start with going to the powersnakes website (www.powersnakes.com) and reading the faq's section. A common assumption is that the power cord is at the end of the circuit. This is not true. Power runs from hot to neutral through the load. The load is the component. The power cord is in the middle of the circuit, with the component in the very middle.
Power cords do not change sound. They provide current. If they also filter out RFI and EMI, they will give a "blacker" background to the musical signal. Thus the music can change. Each system and locality may have differing quantities of RFI/EMI thus affecting the music differently.
All RFI/EMI must be eliminated for the effect to be at it's most effective. The RFI/EMI around the wires in the walls should be small enough and is not near to IC's and speaker wires to have an effect. Contact areas between power cords and IC's and speaker wires need to be kept to a minimum.
BASICS.
Power cords do not change sound. They provide current. If they also filter out RFI and EMI, they will give a "blacker" background to the musical signal. Thus the music can change. Each system and locality may have differing quantities of RFI/EMI thus affecting the music differently.
All RFI/EMI must be eliminated for the effect to be at it's most effective. The RFI/EMI around the wires in the walls should be small enough and is not near to IC's and speaker wires to have an effect. Contact areas between power cords and IC's and speaker wires need to be kept to a minimum.
BASICS.