It's simple. Each and every cable measures differently in capacitance, inductance, propagation, dialetric constant, absolute frequency response, phase over frequency sweep and other factors which these technophiles will quote for every other circuit design and component as a factor of possible sound differences...except for cable.
Somehow, because they do not wish to believe that any of these factors can make an audible sound difference in a cable, because they wish to ignore the factual evidence which proves it (both technical and observable personally, but they do not wish to do that), these factors just don't exist in the cabling realm.
Try looking at a cable manufacturer's technical pages to see measurable differences in cable technologies, Belden:Belden's Technical Info frame page, direct link
To see the entire page including the outer frames go to:Belden
and then click on the Technical Info tab.
Belden, one of the world's largest manufacturer's of cable, will openly admit that some cables will work differently than others in an audio system, for a quicker review (including boiled down technical specs - easier to read overall) see:Blue Jeans Cable stereo audio cable page
where the technical specs will vouch for Blue Jeans' choices of preference - some cables will attenuate high frequencies, for simple instance. If a cable also changes (lets talk straight, simple technical here) phase across the audio frequency realm what kind of effect will that have in bass presentation? How about delay possibly affecting soundstage?
I don't know the exact answer to all those questions, but high-end cable designers either know the details or are experimenting to discover how these factors, combined, effect sound quality.
The science of SOUND, quality cable making can be measured to some exact degree. But including all of the tremendous number of factors properly into the computations to create a great interconnect seems to be somewhat more art than science - and that's where the "tweak" cable companies come in.
It is notable that there is, indeed, a lot of empty promises and snake-oil antics involved with the high end cable business and I'm not going to try to defend that. Sometimes seperating the wheat from the chaff is difficult to impossible - sometimes thanks to our own "experts", the reviewers, who can get so enthused about something new that they over-exaggerate possible differences because they feel that any change from status quo may be good. I'm saying outright that does happen and it just makes finding the truth all that much harder.
Ask how many of these people, who will stand up on their soap box and speak from on high that interconnects do not sound different have actually tried
, in their own systems, a good
quantity of high quality interconnects in order to make this judgement sound?
Almost every time you'll get dead silence in return.
For the most part it's people crowing their personal opinions, not known nor learned through experimental facts. Very little experience, a lot of hot air.
I need a main IC upgrade myself, so what I'm currently using is no great deal. But I will willingly open my doors to a skeptic to listen, on my system, to the cables that I currently have. And, if he / she can't tell me that they hear a difference in a few of the cables I have I'll flatly call them...liars. How about this - if cables don't make a difference tell them to try - on their own system - hooking up 75 ohm SPDIF digital coaxial interconnects to a RCA audio connection to compare the sound to standard 75 ohm audio frequency interconnects (I did to try it. The digital IC's was so bright and sibilant in the audio frequencies I almost choked). Ask them to listen - then get back to you. See how much they'll lie to you claiming "no difference" (if their system is of high enough quality to hear it - and that's an important clause).
Finally, just ask them how the factual, measured differences in each cable cannot
make a sound difference, considering how careful they are about the same differences everywhere else.
Well, buddy, I'm off the soap box. Good luck and regards!