I am a fan of the "cumulative effect" theory (maybe it is just my hypothesis!). I believe that after reaching a certain level with your system, many small tweaks can add up to a nice gain. If you put a $2000 pc in your system, you may not even notice the change. If you change ALL of the cords, like you did, the cumulative effect becomes audible. I think that is one of the reasons why you see so much of a debate as to the merits of expensive pc's.
Skeptical no more
A while back I started a thread called " power cords-snake oil? ".I,like I'm sure a lot of others, was skeptical that different power cords could make much of a difference.Since then, based on feedback I received here, I decided to upgrade my stock cords with all new ones from Dedicated Audio, the "pds", moderately priced but very well constructed cords. They really do make a big difference, I'm really very pleasantly surprised.I do still doubt, however, that spending hundreds more on even heavier, fancier cords could make that much more of a difference. I mean, I see one cord costing more than I spent on several. There has got to be a limit of diminishing returns, right ?(Well maybe I am still a little skeptical after all).