Michael, David, thank you kindly.
Csontos, probably the only times I've had friendly disagreements with the opinions of my learned A'gon colleague Kijanki is with respect to cable-related matters such as skin effect and "strand jumping," both of which I tend to be skeptical about, although I remain at least a little bit open-minded about those issues.
Both questions could be the subject of extensive debates, with the end result probably being that a conclusively proven conclusion cannot be reached, notwithstanding the many claims and "white papers" that have been issued by cable manufacturers.
Also, if I understand correctly, you are saying that the 8 awg 500 strand wire resulted in improvements in both power wiring and speaker cable applications. As you no doubt realize, the technical considerations, and the wire parameters that are most likely to be optimal, are very different for the two applications. An increase in inductance in power wiring, for example, involves a tradeoff between the benefits it may provide in filtering out high frequency noise, vs. the downside it may have of reduced responsiveness to abrupt changes in demand for current. The bottom line on those tradeoffs probably figures to be amplifier dependent, in part because the degree of fluctuation in current demand will vary dramatically among Class A, Class AB, and Class D amplifiers.
In any event, I don't doubt that the improvements you realized with the specific cables you described were real. I would just question the reasons for those improvements, and, to the extent that those reasons are in doubt, the applicability of your findings to other situations.
Best regards,
-- Al