Hi,
given 2 cables with identical lcr values one made of material a (call it wankium) and one of material b (and this one bullonium) in a blind abx test can a difference be heard.
Using the standard approach to ABX testing as implemented and promoted by the ABX Mafia and most vocally Arny Kruegrer and Tom Nousaine, which involve single individuals and a large number of "trials" in a single session the results have been that it was not possible to disguish differences between amplifiers, preamplifiers, CD-Players and of course cables.
If you subscribe to the comforting, if inaccurate notion that "everything except loudspeakers sounds the same" you may simply take their tests as evidence that this position is true. Otherwise there is enough evidence (formal, scientific and published in peer reviewed publications) to suggest their methodes may not be able to make any reliable comment about the presence or absence of audible differences other than extremely large ones.
As no-one is funding large scale blind listening tests for cables (the only large scale listening tests for anything are for perceptual coding for lossy audio compression, AFAIK, with smaller ones done for speakers by Harman) you are unlikely to have at point in the near future to have any formal, scientific results.
Here is an idea, you asked the question, why not seek some funding to make these tests. To get an idea of a well implemented blind listening tests I recommend to read this bit:
http://www.stereophile.com/features/203/index2.html
This illustrates a well designed and set up DB Test that can be used to draw conclusions with any reliability, be they negative or positive.
Kind regards Thorsten