It really is worth spending time and money on making sure the mains power feeding your system is offering the best quailty possible as it is not cost effective to spend what can be a significant outlay on equipment if it is not allowed to perform at its best.
This can be as simple as a electrical contact-enhancer such as the Blue Horizon Clean-It, or high quality mains cables from a manufacturer such as Audioquest or Isol-8.
Of course, the ultimate would be to look at mains power conditioning products such as the Quantum QX-4 from Quantum or the Isol-8 Substation HC or Isol-8 Substation LC power conditioners from Isol-8.
Once again; don't forget that we at Audio Destination can advise, or demonstrate these products so you can hear just how much your system can come alive, refreshed.
Again; if you have had no experience of this type of procuct, all we ask is for you keep an open mind, and let us help you achieve the most from your system, so that you will enjoy your music more.