For me my best powercord did the trick on my powersource ( KEMP). I discovered the benifits by accident when I was swapping around some powercords. The powersource has a 20A IEC connector and recently I bought some ARC stuff which also have 20A IEC's. The Harmonix Studio Master is now the connection between powersource and wall.
Tip: try your less best powercord between powersource and wall. You know what you don't like about that cord and that will probably be magnified now !!
Tip: try your less best powercord between powersource and wall. You know what you don't like about that cord and that will probably be magnified now !!