Krell Evolution e Series Manual - Manual (Page 7)

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Revolutionary Krell CAST Technology
Current Audio Signal Transmission, termed CAST, is a revolutionary method of
connecting analog audio components for unparalleled sonic performance. Innovative
engineering combines the new Krell CAST circuitry with existing Krell Current Mode
technology to create entire CAST systems that reproduce music with incredible range,
tonality, and precision.
The Voltage Signal Transmission
and the Traditional Audio System
Traditionally, signal is transmitted in the voltage domain between two components. In an
audio system, each component is a discrete entity with unique characteristics that act
upon the musical signal independently. Each component is unaware of the other
components in the system. The cables that connect the components also have their
own electrical characteristics, which affect the sonic presentation of the entire system.
CAST transmission unifies individual components and interconnects into an electrically-
linked whole. The original signal remains unaltered from source to speaker.
CAST Basics
Here is how a CAST audio system works. Internally, each CAST source transfers, or
amplifies, current using Krell Current Mode circuitry. This current signal is then output
using CAST circuitry. When the signal is received by a CAST input, Krell Current Mode
circuitry again takes over until the signal reaches the loudspeaker. By maintaining the
musical signal in the current domain from beginning to end, an entire CAST system
behaves as if it is one component. With CAST, circuit board properties and signal
transmission aberrations between components are eliminated. Cable impedances and
their effects on the transmitted signal are non-existent.
How CAST and Krell Current Mode Interact
While CAST is a new method of transferring the musical signal between components,
its origin stems from Krell Current Mode, the technology developed to transfer the
musical signal within a component. CAST combined with Krell Current Mode circuitry
takes signal transmission to the next evolutionary level. In essence,
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