Hell, my whole system can sound bad to me one week and a few days later it sounds great. So much is due to my mood, my ears, my work week, my Amex bill, the weather. Who knows? I think one's ears are so much more subjective than one's eyes.
that said, I have not done double blind testing but I have heard differences in cables that were immediately apparent; this was in speaker cables mostly and IC cables to a lesser extent, not power cords. I think power cord differences are extremely subtle if they exist at all. But do I buy the aftermarket powercords? You bet. why not it's fun.
One last story, I put new Siltech speaker cables into my system a couple of years ago and put on the first CD to listen. My wife came into the listening room and said "Wow that sounds so much better." I was floored; in all previous upgrades she had never had a strong point of view or was somewhat cynical.
that said, I have not done double blind testing but I have heard differences in cables that were immediately apparent; this was in speaker cables mostly and IC cables to a lesser extent, not power cords. I think power cord differences are extremely subtle if they exist at all. But do I buy the aftermarket powercords? You bet. why not it's fun.
One last story, I put new Siltech speaker cables into my system a couple of years ago and put on the first CD to listen. My wife came into the listening room and said "Wow that sounds so much better." I was floored; in all previous upgrades she had never had a strong point of view or was somewhat cynical.