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.
Because of this, the "quality" of the interconect is not as critical.