Jason, As for what I hear, and at the risk of using terms that cannot be defined scientifically, I hear a richer low end and what seems to me to be a more detailed sound across all frequencies with the silver cables as opposed to the copper. And yet I also feel like the highs are sometimes almost to high with the silver. I also believe that I would be hard pressed to find any real "problems" with the copper cables, and just to be clear when I say copper I do mean things like the Canare Gepco, Belden or any of the better coppers that have shielding. As for RFI rejection, is there a good, better, best type of shielding...I don't really know. I do know that I am slowly phasing out any of the cables I have that are not shielded. IN fact just last weekend I ended up with a cell phone noise in one of the eight channels I was running due to a non shielded cable. But since I am running an 8 track recorder with various preamps I don't want to spend the money all at once to switch out the non shielded stuff. The other thing I have noticed with the various solid silver cables is that they seem to be a much beefer cable, thicker jackets along with thicker layers of insulation internally. I say solid silvers because the Belden silver plated is just the opposite with a much narrower diameter. If I had the money I would run all silver cables. I'd opt to get the highest quality I could. Would the difference or even perceived difference be worth it? It would to me. But then it might not be to someone else. IN the big picture I think we all agree that not using the cheapest cables is best. Using cables with a decent shield in necessary. Beyond that I think the Copper VS Silver becomes more a personal choice. and like you said the only real way is to do a side be side comparison, but setting up a test that is exactly the same except for cables is not that easy. Even differences of a few inches in mic placement can make a difference and it would have to be the exact same material etc, etc.