Geoffkait - I'm afraid it's not that easy. I have heard systems that did not reveal differences in cables. Who knows why?
r u referring to your own system ?
I have had two manufacturers of amps/pre/phono's, both EE's (Electronic Engineers) sit in my listening chair and listen to music.
They both heard differences when I changed out various cables. This included gear running balanced and se signals. Interestingly , when I first reached out to them about their products, they told me cables don't matter. One of them didn't even offer power cables with his gear, because "my customers usually have their own power cables". My opinion is these manufacturers don't play in this space and quite frankly, I think that admitting to customers that cables can make a difference, might imply some kind of weakness in the gear. This totally ignores the fact that The Room and power going into the room are both Alpha over the amp/pre's/ phono's......and everything else in there too.