Some of the more "esoteric" aspects of cable materials, layup, etc (and impact on sound) can come into play for analog interconnects and speaker cables. For digital cables and power cables, sufficient noise dissipation and shielding is the only thing that impacts sound...senseless to pay an arm and a leg for the latter as it can be accomplished at a very reasonable cost (no killer r&d crap required).
What was the first power cable that you noticed a difference in the sound?
I have bought six or seven different power cords, none over $500 and have noticed little or no change in the sound of my system. All the cables are 12 gauge or bigger. Without talking about cables made with unobtainium, where did you start hear a difference.
Thanks.