I didn't find grain in Wireworld.. Look elsewhere for the grain."
I should have been more clear. Not everyone here's this and it depends on several factors. Its a trait seems exclusive to copper. Your equipment needs to be revealing enough to bring it out, as well. The only success I've had eliminating this flaw is with well designed solid core copper cables. That doesn't mean all stranded cables will do this, but the ones I've tried all do. It can happen with solid core, but all things being equal, its not as bad.
Some people just don't hear it, but I do find that once you hear it for the first time, it gets easier to pick out because you know exactly what to listen for. Its very similar to things like break in and other types of differences in cables. When you are a beginner, most people are naturally skeptical about hearing certain claims made by other audiophiles. And as we all know, once you have that first breakthrough, and here something for the first time that few others can hear, it now sticks out like a sore thumb, and you can't "not hear it" even if you wanted to. I haven't heard this with silver cables. Silver has other issues, like a natural brightness, but that's not the same sound I'm talking about.
Unless Wireworld has changed their designs recently, they make stranded cables. If I remember correctly, the Eclipse IC has something like 50 strands. That's way too many to be a solid core design. If you look at my AQ cables, there are 3 pins on the connector (xlr), and 3 runs of solid core wire, one for each pin.