Can any of you guys enlighten me on the basic sonic signature of the four levels of AH cables available (Concept, Harmony, Transparency and Dimension), and whether the conductors in these cables copper or silver? At the AH prices, I would be most interested in the best performance regardless of price (probably Dimension or Transparency?), and I would be comparing them to other very good cables, but I cannot find that information on the website. Also, what are the X-series speaker cables shown on the website? is that a former name of one of the four levels listed above? I am going to audition the Dimension interconnects and was just curious for a little more information and some user feedback.