you guys always turn that into "cables all sound the same" vs "cables sound different". you cannot compare the experience of someone who buy gears paying attention to specs, and someone buying gears because they though it sounded good.
- the first one will always be careful to buy gears with specs that fit well the rest of the equipment, be it power, impedance(matching or bridging). anything that can improve fidelity and stability of the system.
that person can stick pretty much any cable in the mix and will get the same sound. because when you have a damping factor of 20 or more, the change from one cable to another will be negligible, and that's how it should be.
so that person will say that cables don't matter as long as they are made correctly for the intended purpose. also that person would never buy weird cable with metascience claims, avoiding all the strange stuff in the process.
- the other person buying gears by hear may at some point in time buy a 150ohm amp or use a 1970 gear (or some professional stuff with kilos of ohm) and plug it into some modern stuff made for ipods. it usually doesn't get to the point where something breaks, but it's easy to imagine the system not performing as intended and lacking stability(it might very well be what sounded pleasant to the person).
in those situations we go from something not linear with one cable to something also non linear with another. the chances of both sounding different are much higher than when testing a system in it's optimal stability even with such a small thing as cable switching.
- another most obvious situation where messing with weird cables can alter the sound is with multidriver IEMs. they are low impedance stuff going often from 10ohm to 60ohm depending on the frequency. you can all imagine how easy it is to change the signature by changing the cable impedance. give some messed up cable with strange specs and the listeners will become a cable believer. simply because the signature will indeed change a great deal(I'm talking several db here sometimes).
so yes cables can change sound, but here is what I think about cables.
if the sound changes a lot by changing cables, then something is wrong(I include multidriver IEMs with messed up impedance responses as being wrong but you might not share my opinion on this):
1/ one of the cables is bad(it could be on purpose and very expensive but it would still be bad).
2/ or the gears have a problem, some ground troubles, some compatibility with the other gear, and some more...
having the same sound when changing cable is for me a sign that my system is well done. and that's my conclusion on cables.