Interesting. I wonder what the difference in composition would be between "speaker-intended" wires, and AC? Yet, that anecdotal "no one raved about them" is telling. Still, I would wonder. Copper is copper. Extruded is extruded. Just wondering out loud.It’s probably not possible to define a general purpose answer with any certainty, but presumably the reasons relate to some combination of factors such as those I cited earlier whose audible significance is not well established in a quantitative manner. And also in a lot of cases to differences in inductance, especially if (as I indicated) the impedance of the speakers is low at high frequencies and/or the cables are relatively long.
Regards,
-- Al