I have a Ratshack also, do you want it? Is not the top of the line one but is more or less the same, same thickness, and about the volume, this is not true, you can use a 25' extension and still use the same volume, the power has nothing to do with the extension, if you have a drop in volume, you have also a drop in performance of the amp and a drop in sound quality, for sure, OTOH the sonic signature of an amp I think is not realted to the volume you use, I mean listeneable volumes at least...it will sound the same at low or high volume....
I don't think is a matter of the resistance, or capacitance, unless you want to be crucify in public, never state this here, or you will be in serious troubles with the "cable believers"......LOL.....in the audiophile world the "difference" we hear (if any) I think is not a measurable parameter, otherwise there "has to be" a scientific explanation with numbers, for that phenomenon, and there is not such explanation to the date AFAIK, IMO what make the difference if not the resistance or capacitance of a cable, but any other parameter, or the interaction between them, maybe that we don't even know it exists, there is a difference of course, but to the date there is no such numbers that are able to "explain" that "difference", OTOH in 1' of cable how big this figures could be, this parameters are completelly irrelevant for short lenghs, and there is an audible difference according to many respectable members, so has to be true, I beleive to certain point in this theory, from certain point on, IMO is a little of both, true and placebo, or maybe a whole placebo, but this is just IMO....I have not tried so many cables anyway to support that statement and even though, there is also the subjective factor on this, maybe I'm not able to hear the difference, who can tell for sure, what you are able, or not, to hear, this is a whole mistery, and if you say you do, who can tell you that you don't, or that there is not such a difference....