well, of course i expected someone to respond that "they" (pwr cords) make a difference. yes, the cord has been in use for awhile. and yes, it does change the sound- the bass was more extended, things were a bit clearer and cleaner, and the highs were more open and extended- but just way too BRIGHT. but my MAIN point is, you should safely and sanely presume (correctly imo) that the cords that come with your audio gear are meant to do what they need to do, nothing more, and nothing less. OTOH, if at some point you still are determined to try an aftermarket cord, i would say don't do it because someone else told you that the cords you're using "suck", but that you yourself have come to believe that they're of poor quality, and/or are insufficient in some way. in my situation, i was pretty upset and stressed out for a while by the awful screach coming from my tweeters, and now i'm just relieved that i was able to solve this (annoying as hell) problem.