devilboy,
You seem to make some sweeping claims that cables always change the sound and act as tone controls. What do you base that upon?
I’m no engineer, but having watched electric engineers hash this cable debate stuff out for many years, many will tell you - (that is, ones who aren’t trying to sell you a cable) that for the most part, cable performance has been a well understood phenomenon for a long time and if you select a well engineered cable with the proper characteristics for the job (e.g. insulation, capacitance values, etc) all the signal will get through. There isn’t therefore any particular reason to expect a sonic difference if you are using two well engineered cables both suited for the same job. Sure, some cables can be engineered to sound different by altering certain parameters, but they can also work essentially identically.
In controlled listening tests, (blinded for sighted bias), sometimes cables seemed to be distinguishable, other times not. Many times people who have sworn that they could easily distinguish between a high end cable and cheap cable have not been able to do so once they didn’t know which was playing. (I’ve experienced this myself).
Apropos of the subject of interconnects, here’s one example testing a variety of interconnects (french site translated):
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=...Note the measurements of the cables; they are so similar it should have helped predict the results of the blind tests: that the panel could not reliably distinguish between the cables when they didn't know which was playing.
So....do cables sometimes change the sound of a system? Seems plausible it can be the case for a variety of reasons. But do they always change the sound and are high end cables always distinguishable from lower priced cables? Apparently not.