If you are refering to IC's. I have not done the Serenade/ Crescendo A-B, but have found some IC's that flat-out smoked the Crescendo's for about the price of the Serenades, maybe a little less. The IC's are made by a company out of NJ called Virtual Image, the Pile Driver 18. If you search the forums here on Audiogon, you can read more detailed posts where I went into the differences between the V.I. cables and the Crescendo's. If I can answer any questions for you about the V.I. cables, feel free to e-mail me.
BTW, V.I. also makes excellent power cables.
BTW, V.I. also makes excellent power cables.