In my systems I also found that an audio grade outlet made a significant difference. I use a Wattgate outlet on a dedicated line that goes straight back to the panel box. When considering the audio grade outlet I A/B'd it with a regular outlet and found the former to be better extended on both ends, the soundstage better balanced, and the sound more liquid. I had heard that Ray Kimber always said that the outlet made a big difference but I was doubtful. I bought one anyway and swapped it in and out to see if I could hear a difference, and I sure did. Power cords make a difference too but based on my experience I'd recommend that you add a good outlet into the mix.
