Power cords can make a big difference, when doing these comparisons. I remember when I got my Krell S-1500 amp, I used the stock cord, because Krell recommended it. It actually sounded really good and really balanced. I tried my reference power cords, and while there were improvements, including focus, it lost that balance and just didn't sound as good to me overall.
For me, the solution was Krell's Vector HC power cord, believe it or not. It improved image focus, while keeping everything balanced. I like the power cord so much, I've put one on my power conditioner and another on my home theater processor. These power cords need a good 300-400 hours of break in though...
Dave
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