Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER manual Letter from Dan D’Agostino

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A Letter from Dan D’Agostino

Dear Audio Enthusiast,

Thank you for your purchase of the Evolution Two preamplifier.

My new Evolution products represent a watershed in my design philosophy and in my quest for audio components that deliver absolute truth in music reproduction. The expanse of the Evolution Two monaural design has allowed me to explore fully the advantages of current mode topologies. The resulting circuit utilizes no feedback and has a bandwidth of 2 MHz.

I have always been fascinated by the artistry inherent in great musical performanc- es, and my new Evolution Two preamplifier delivers the these performances in their entirety, unaltered, to the amplifier. At the same time, the Evolution Two pre- amplifier provides the flexibility and control necessary for the listener to thoroughly enjoy a high performance audio system. It is my pleasure to make the Evolution products available to you.

The preamplifier plays a vital role in audio playback. At no other point in the repro- duction process is the music so vulnerable to change. The signal level at the pre- amplifier stage is small, and is particularly susceptible to noise and distortion. In order to solve this problem, the Evolution Two employs Krell Current Mode gain stages from input to output, and Current Audio Signal Transmission (CAST) receivers and transmitters. Unprecedented in Krell design history, these unique topologies combine in the Evolution Two preamplifier to form a circuit that has no audible sonic signature.

The Evolution Series represents a new direction for Krell, where breakthrough cir- cuit topologies also represent the vanguard in convenience and control. Sophisti- cated communication circuitry allows from two to eight preamplifiers to be linked to a single master from which all user interface is accomplished. The Evolution Two Monaural Preamplifier is designed to complement perfectly the Evolution One Monaural Power Amplifier. Combine the Evolution One and Two with my new LAT-1000 loudspeakers, and experience the extraordinary capabilities of an Evolution System.

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Contents Evolution Page Contents List of Illustrations Letter from Dan D’Agostino Letter from Dan D’Agostino Krell Legacy About KrellHow Cast and Krell Current Mode Interact Voltage Signal Transmission Traditional Audio SystemRevolutionary Krell Cast Technology Cast BasicsBest Musical Performance Cast Cable ConstructionEvolution Cast Core Technologies Zero Feedback Balanced Current Mode DesignEnsuring Maximum Performance Separate Power Supply Fully Balanced Discrete Volume ControlAdvanced Microprocessor Control Custom Software Inputs and Outputs ConfigurationsDefinition of Terms Preamplifier Krell Current ModeOperation TechnologyOpening the Evolution Two Shipping Carton Unpacking and PlacementLeft/Right Channel Orientation To Remove the Preamplifier Channel from the Shipping CartonRepeat Steps 1-5 for the remaining preamplifier channels PlacementAC Power Guidelines Quick Start Connecting the Evolution Two to Your SystemOperating the Evolution Two Linked Mode 11 12 13 Anatomy of an Evolution TwoEvolution Two Remote Control Front Panel Description PowerChassis Remote Functions on the Front PanelDisplay Preamplifier FunctionsNavigate/Customize Level ControlMenu Button or Key Enter Button or KeyBattery Installation and Removal Remote Control DescriptionAmplifier Functions Compact Disc FunctionsIEC Power Cord Receptacle Inputs Back Panel DescriptionOutputs 35, 36 Main Bus Outputs37, 38 Record Bus Outputs Remote Connections on the Back Panel42 RC-5 43 RS-232Link Control Phono Stage ConnectorXLR Pin Configuration Connecting the Evolution Two to Your SystemInput and Output Connections Connection StepsNever connect two power supplies together To Connect Multiple Evolution Two Preamplifiers via can Link Connections Using can LinkEvolution Two Operation On/Off and Stand-by Operation Linked ModeTo Turn Off Your System Play and RecordOperation Using can Link Navigation Conventions Customizing the Evolution TwoAC Mains Menu FunctionsBacklight Enter the menu, thenUse to make a left channel respond as a right channel BalanceChannel Assign Use to make a right channel respond as a left channel CloneDisplay Front panel display times out after 5 seconds InfoFront panel display is always on To select input names for other inputs, repeat Steps 3 Input Level TrimInput Name Phase of the selected input is unaffected Input PhasePhase of the selected input is inverted 180 degrees Input TriggerIR Out Control Evolution Two responds to 12 V input trigger commandsLink Control can Link Output of the Evolution Two is completely silenced MuteOutput Trigger RC-5 Control RS-232 Control Recalls the factory settingsRecall Software Clone SaveInitiates the software clone Tape InputBegins the software clone process Theater Mode +12 dB. The options are Enter the menu, then Volume DisplayQuestions and Answers Troubleshooting System Noise Connection of multiple preamplifier channels Appendix can Link and Multiple Evolution Two PreamplifiersAppendix can Link and Multiple Evolution Two Preamplifiers Warranty Warranty To contact the Krell Service Department Return Authorization ProcedureService@krellonline.com AM to 500 PM ESTControl outputs Specifications

EVOLUTION TWO MONAURAL PREAMPLIFIER specifications

Krell Industries has long been a name synonymous with high-fidelity audio equipment, and their EVOLUTION TWO MONAURAL PREAMPLIFIER is a testament to this legacy. This premium preamp is designed to cater to audiophiles, delivering unparalleled sound quality and meticulous attention to detail.

At the heart of the EVOLUTION TWO lies Krell's commitment to superior audio performance. The preamplifier employs a fully balanced, differential signal path that minimizes noise and distortion, ensuring that the audio output is pure and true to the source. This architecture not only enhances sound quality but also integrates seamlessly with other high-end audio components in any setup.

One of the standout features of the EVOLUTION TWO is its advanced power supply design. Krell employs a toroidal transformer coupled with high-energy storage capacitors to provide stable, clean power. This allows for improved dynamics and transient response, helping to reproduce the complex nuances of music in a way that engages the listener. The preamplifier's power supply is designed to operate with extreme efficiency, ensuring consistent performance even during the most demanding listening sessions.

Additionally, the EVOLUTION TWO comes equipped with Krell's proprietary CAST (Current Audio Signal Transmission) technology. This innovative feature allows for a direct, impedance-matched connection between components, significantly reducing signal degradation over long cable runs. Audiophiles will appreciate the clarity and fidelity produced by CAST, revealing subtle textures and details in their favorite recordings.

The preamplifier also includes a range of inputs and outputs, catering to various audio sources and systems. Users can connect multiple devices, including digital sources, with ease, thanks to the EVOLUTION TWO's advanced input switching capabilities. The unit supports balanced XLR connections as well as unbalanced RCA outputs, providing flexibility for users with different equipment configurations.

Moreover, the EVOLUTION TWO MONAURAL PREAMPLIFIER boasts a stunning aesthetic, showcasing Krell's hallmark design philosophy. With its sleek chassis and elegant finish, the preamp not only sounds good but looks great in any audio setup.

In summary, the Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER is a high-performance audio component that encapsulates cutting-edge technology and exceptional craftsmanship. With its balanced signal path, innovative power supply design, CAST technology, and versatile connectivity options, it is a remarkable addition to any serious audiophile's system, promising a listening experience that truly transcends the ordinary.
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