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Krell Audio Components KCT 03/13/2007 04:44 PM The Krell Current Tunnel (KCT) CAST stereo preamplifier holds the distinction of being the finest sounding, most technologically advanced, and most system friendly stereo preamplifier ever designed by Krell. Using CAST technology and power supply regulation that is a direct result of the development of the Master Reference Amplifier, the KCT is able to deliver a usable bandwidth that extends to 1.5 MHz. The result is seamless, transparent musical reproduction of even the most dynamically demanding sources. FEATURES The KCT derives its name from the way the signal is routed from its input to its output. The signal is brought into the KCT in the current domain from a CAST source, for example from the new Evolution 505 SACD/CD Player. The signal stays in the current domain as it travels through the KCT, protected from extraneous noise and unwanted signal interference as if it were in a tunnel. Ease of operation is also accounted for in equal measure with features that include dual-zone operation, with independent volume controls, Theater Throughput for integration into home theater systems, and RS-232 controls for whole house automation. The KCT is a stereo preamplifier that delivers the ultimate stereo performance today and the opportunity for continued growth into the future. The power supply regulation is directly descended from the Master Reference Amplifier. Sixteen independent regulators, each closely coupled to the current tunnel gain stages, deliver seamless, transparent reproduction of the most dynamically demanding sources. CAST Current Audio Signal Transmission (CAST) is a proprietary Krell circuit technology for connecting analog components, in which the audio waveform is transmitted between components in current rather than voltage domain. Deceptively simple in concept, CAST reverses conventional wisdom that says voltage transfer from source to load demands that a preamplifier's output be low impedance and that the power amplifier's input be high. Unfortunately, this combination places a large burden on the connecting cable in that its impedance will alter or distort the http://www.krellonline.com/krell_component.php?id=72&page=KCT Page 1 of 2 Krell Audio Components KCT 03/13/2007 04:44 PM the connecting cable in that its impedance will alter or distort the signal voltage operating the amplifier. In contrast, CAST transfers current rather than voltage from a high impedance source to a low impedance load. In doing so, a cable's effect is minimized, if not totally eliminated, as its impedance characteristic becomes but a minute portion of the total interface. CAST results in far simpler and far more accurate signal transfer. It unveils musical subtleties as it immunizes a system against cable-induced variables. Krell components connected via CAST perform as if they are all part of a single unit yielding astounding levels of accuracy and realism. Building on the proven merits of Krell Current Mode circuitry, current tunnel topology provides extraordinary bandwidth and phase accuracy. These attributes empower the KCT with the ability to preserve the soul of a musical performance by correctly presenting the complex harmonic structures originally generated by the instruments themselves. By logarithmically extending the usable bandwidth to 1.5 MHz, Krell engineering overcomes the amplitude and phase variations that plague voltage-based designs. http://www.krellonline.com/krell_component.php?id=72&page=KCT Page 2 of 2