I just bought all my Audioquest cables (which are used!) from a dealer and I was just wondering if I want to ever upgrade to another set of Audioquest cables, where do I go? I currently have Opal interconnects, Crystal and CV-4 speaker cable for my Vandersteen 2CE Sigs. I'm running the Crystal to my low frequencies and the CV-4 to my highs. I asked people which cables should be run to the highs and which to the lows, and people were telling me the Crystal should go to the highs because it's a better cable. I was running my old Type-4 to the highs while I waited for my CV-4 to arrive and when I made the change, the difference was huge. I was told that mid to high freqs. run on the surface of the cable where as the low freqs. run along the inside. I don't know if this is true, but the CV-4 (PSC) was better sounding than the Type-4 (LGC) on the highs. BTW, I dont own a $50K Truck nor a $50K boat. Thanks for all the advice, but I'm still looking for a listing of the cables for upgrade purposes in the future.