Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER manual

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trol circuitry team ultra-stable voltage reference chips with the same discrete high- current driver and output transistors used in the main analog regulators. These ample power reserves are brought to the Evolution Two via high reliability 12-pin connectors with machined, gold plated, three-amp contacts.

Secondary voltage regulators for each analog stage in the Evolution Two provide ultra-quiet, rock-solid supply rails, as well as complete isolation between all the analog stages.

When the Evolution Two is placed in stand-by, all the analog circuitry continues to operate at the same bias current; however, the main analog supply voltages decrease by 30 percent. The result is a corresponding 30 percent reduction in power consumption and heat without the need to wait for the electronics to “warm up” before listening.

Advanced Microprocessor Control

and Custom Software

A user menu allows extensive customization of the preamplifier operation, includ- ing (but not limited to) input names, input-specific gain trims, Theater Through- put™, display brightness, and 12-volt triggers. Integration is supported via RS- 232,12 Volt trigger, and RC-5 inputs, as well as an IR transmitter for programming a learning remote control.

A built-in digital network allows multiple preamplifiers to be linked together, blend- ing the convenience of a single-chassis stereo preamplifier with the sonic perform- ance obtainable only from individual monaural preamplifiers. Six or more preampli- fier channels can be “daisy-chained” together and controlled simultaneously for multi-zone or home theater applications. The digital link allows the user settings in one preamplifier channel to be conveniently “cloned” to other linked preamplifier channels. Similarly, upgraded software in one preamplifier channel can be installed in other preamplifier channels using the digital link.

In the event that the DC level at any of the preamplifier channel outputs exceeds a nominal level, sophisticated protection circuitry safely mutes the outputs, traces the source of the excess DC, and displays a diagnostic message on the main dis- play. On power-up, the microprocessor verifies that all the circuit boards in the preamplifier channel are properly connected and are compatible with the version of software installed.

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Contents Evolution Page Contents List of Illustrations Letter from Dan D’Agostino Letter from Dan D’Agostino About Krell Krell LegacyVoltage Signal Transmission Traditional Audio System How Cast and Krell Current Mode InteractRevolutionary Krell Cast Technology Cast BasicsCast Cable Construction Evolution CastBest Musical Performance Zero Feedback Balanced Current Mode Design Ensuring Maximum PerformanceCore Technologies Fully Balanced Discrete Volume Control Separate Power SupplyAdvanced Microprocessor Control Custom Software Configurations Definition of TermsInputs and Outputs Krell Current Mode PreamplifierOperation TechnologyUnpacking and Placement Opening the Evolution Two Shipping CartonLeft/Right Channel Orientation To Remove the Preamplifier Channel from the Shipping CartonPlacement AC Power GuidelinesRepeat Steps 1-5 for the remaining preamplifier channels Connecting the Evolution Two to Your System Quick StartOperating the Evolution Two Linked Mode Anatomy of an Evolution Two 11 12 13Evolution Two Remote Control Power Front Panel DescriptionChassis Remote Functions on the Front PanelPreamplifier Functions DisplayLevel Control Navigate/CustomizeMenu Button or Key Enter Button or KeyRemote Control Description Battery Installation and RemovalCompact Disc Functions Amplifier FunctionsIEC Power Cord Receptacle Back Panel Description InputsOutputs 35, 36 Main Bus OutputsRemote Connections on the Back Panel 37, 38 Record Bus Outputs42 RC-5 43 RS-232Phono Stage Connector Link ControlConnecting the Evolution Two to Your System XLR Pin ConfigurationInput and Output Connections Connection StepsNever connect two power supplies together Connections Using can Link To Connect Multiple Evolution Two Preamplifiers via can LinkOn/Off and Stand-by Operation Linked Mode Evolution Two OperationPlay and Record To Turn Off Your SystemOperation Using can Link Customizing the Evolution Two Navigation ConventionsMenu Functions AC MainsBacklight Enter the menu, thenBalance Channel AssignUse to make a left channel respond as a right channel Clone Use to make a right channel respond as a left channelDisplay Info Front panel display is always onFront panel display times out after 5 seconds Input Level Trim Input NameTo select input names for other inputs, repeat Steps 3 Input Phase Phase of the selected input is unaffectedPhase of the selected input is inverted 180 degrees Input TriggerEvolution Two responds to 12 V input trigger commands IR Out ControlLink Control can Link Mute Output TriggerOutput of the Evolution Two is completely silenced RC-5 Control Recalls the factory settings RecallRS-232 Control Save Software CloneTape Input Begins the software clone processInitiates the software clone Theater Mode Volume Display +12 dB. The options are Enter the menu, thenQuestions and Answers Troubleshooting System Noise Appendix can Link and Multiple Evolution Two Preamplifiers Connection of multiple preamplifier channelsAppendix can Link and Multiple Evolution Two Preamplifiers Warranty Warranty Return Authorization Procedure To contact the Krell Service DepartmentService@krellonline.com AM to 500 PM ESTSpecifications Control outputs

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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