The bottom line is that cables are extremely system dependant. A particular line may be excellent in one system and garbage in another. You must play with many brands and decide which one is for you. I use Anti-Cables which are cheap and work in my system better than any Cardas, Audioquest, Purist, etc., etc. They come with a money back guarantee, and you should try these out to see if they indeed work in your system. I have no affiliation with Anti-Cables except to say that they absolutely transformed my system.
