Ghstudio is largely right. A lot of the answer depends on what equipment you have. But one in ten thousand? Is that people or ears? :-)
For instance, if you have a fairly high wattage amp with a stock cord, you will very likely hear a difference by upgrading to a larger gauge cord. Better dynamics will be the most obvious improvement. Source? Clean up the power, where a properly shielded cord help, and that will improve, too.
Of course, none of this is guaranteed, but tell us more, Cfarlie. Whatcha got?
For instance, if you have a fairly high wattage amp with a stock cord, you will very likely hear a difference by upgrading to a larger gauge cord. Better dynamics will be the most obvious improvement. Source? Clean up the power, where a properly shielded cord help, and that will improve, too.
Of course, none of this is guaranteed, but tell us more, Cfarlie. Whatcha got?