While there may be no technical reason a larger guage cord will work better, my experience is that the larger guage cords that I have tried have been better performers overall with my integrated amplifier. I have not tried anything heavier than 10 guage but I think that a heavier cord may have advantages over a smaller one with a fairly current hungry piece of equipment. With my digital gear, I have not found that guage is as significant, and actually use a 26 guage DIY cord on my DVD player that sounds better than a Cardas Golden cord which I had used on that piece before. I wouldn't consider, however, even putting that cord on my amp for obvious reasons.
