wireman:Yes, but it's easy for you to detect the difference in cables and polarity given the standard of equipment you're using - my AV is all RA'd too (notably the 2500 transport, which I agree benefits from an RA powerkord cable no-end). The improvements are less obvious with lesser equipment, and frankly I'm appalled by the way some of the systems I see are wired together still with in-the-box free leads when asked to go install dedicated radial or ring circuits. Greater improvements could be had by just improving those standard leads rather than paying me to install a dedicated mains supply. It seems that quite a few enthusiasts miss the obvious little improvements they can make, and instead just jump wholesale into the deep end. But that's enthusiasts for you...Well yes maybe higher end kit is easier to detect these differences. Im using a RA Reference powerkord on my amp and boy what a difference its made, totally night & day! Mind you at £254 it oughta be, its DCT treated aswell.
I also own the Denon 2500BT & im using a RA classic powerkord with that & it made a huge difference, they really are great powerkords, there pricey but then again quality normally is.