If you do a search in the archives, you'll find the answer is yes. CAST is Krell's proprietary technology. Check out www.krellonline.com.
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CAST is proprietary to Krell. Essentially it keeps the connected component circuitry balanced in current domain by feeding a low impedance input with a high impedance source, quite the opposite of what is typically used between sources (low impedance) and inputs (high impedance) in all other connective configurations.
Because of this, the "quality" of the interconect is not as critical.
I had the chance to use Cast cables on my Krell 28c to my KCT and 450mx. I also compared them vs. regular but very expensive xlr cables: MIT Oracle 1.
I found that for the money CAST is the best but somehow it sounded thin to me. The Xlr cables gave me more body and weight.
I would stick to the Cast cables to save money if I was you. They sound fantastic and 90% of the expensive cables.