Krell Industries Evolution 600, 900, 400 manual Evolution Amplifier Features and Technology

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SECTION ONE

Evolution Amplifier Features and Technology

This section describes the innovative features and technology of the Evolution Series amplifiers, and defines CAST and other key terms used in this reference. There are six amplifier models in the Evolution Series: the 302 Stereo Power Amplifier, the 402 Stereo Power Amplifier, the 403 Three-channel Power Amplifier, the 400 Monaural Power Amplifier, the 600 Monaural Power Amplifier, and the 900 Monaural Power Amplifier. The compact chassis of the 400 Monaural Power Amplifier contains all of the high power, wide bandwidth, and low noise character- istics designed into all Evolution Series amplifiers.

Features

Evolution Series amplifiers are designed with a signal path that incorporates Krell Current Mode and CAST circuitry.

All amplifiers feature massive power supplies. The power supply makes use of extensive electrical and magnetic shielding to keep radiated interference out of critical amplifier circuits.

The Evolution 302 design utilizes a 3000 VA power supply. The Evolution 402 and Evolution 600 are equipped with a 5000 VA power supply, and the Evolution 403 and Evolution 900 house 6000 VA power supplies.

Internal high-current line conditioning circuitry filters RF noise on the AC mains, as well as compensating for asymmetrical power waveforms and DC on the mains.

Advanced microprocessor control monitors critical operational parameters. Output current, DC offset, rail voltages, and operating temperature are all continuously monitored.

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Contents Evolution Important Safety Instructions Contents List of Illustrations Letter from Dan D’Agostino Evolution Amplifier Features and Technology FeaturesRevolutionary Krell Cast Technology Voltage Signal Transmission Traditional Audio SystemHow Cast and Krell Current Mode Interact Cast BasicsCast Cable Construction Evolution CastBest Musical Performance Definition of Terms Inputs and OutputsOperation Krell Current Mode TechnologyActive Cascode Topology Unpacking and Placement Opening the Evolution Amplifier Shipping CartonPlacement AC Power GuidelinesAnatomy of an Evolution Amplifier Evolution Amplifier Front Panel Evolution 402 shownPower Status Indicator PowerPower Button Front Panel DescriptionEvolution 302 Stereo Amplifier Back Panel Evolution 402 Stereo Amplifier Back Panel Evolution 403 Multi-channel Amplifier Back Panel Evolution 400 Monaural Amplifier Back Panel Evolution Monaural Amplifier Back Panel Evolution 600 shown Back Panel Description OutputsInputs Remote Connections IEC Power Cord ReceptaclePower Breaker Switch VDC In/Out 12 V TriggerCast Connections Connecting an Evolution Amplifier to Your SystemXLR Pin Configuration Balanced ConnectionsEvolution DC Protection Circuitry/Using Tube Preamplifiers Connection StepsSection Five Troubleshooting System Noise How to Evaluate Amplifier OperationError Codes Diagnostic Code Possible Condition Course of ActionQuestions and Answers Warranty Page To contact the Krell Service Department Return Authorization ProcedureHow to Expedite Service How to Return a ProductSpecifications Frequency ResponseRms at 4 Ohms Hz to 20 kHz +0, -0.18 dB Hz to 120 kHz +0, -3 dB WNER’S Reference Krell INDUSTRIES, INC

400, 900, Evolution 600 specifications

Krell Industries is a renowned namesake in the high-end audio and home theater equipment market, revered for its cutting-edge engineering and exceptional performance. Among its standout offerings are the Krell 900, Evolution 600, and Evolution 400, each designed for audiophiles seeking to elevate their listening experience.

The Krell 900 is a powerhouse amplifier that marries high-output power with a sophisticated design. Featuring Class A/B amplification, it operates with minimal distortion, ensuring that sound quality remains pure even at high volume levels. The unit boasts a massive power supply that allows it to handle a wide variety of speaker impedances effortlessly. With its robust build and a sleek, minimalist aesthetic, the Krell 900 is not only a technical marvel but also a visual centerpiece in any audio setup.

On the other hand, the Evolution 600 represents Krell’s commitment to harnessing the latest technology to achieve superior sound. This amplifier utilizes Krell’s proprietary current mode topology, which optimizes power delivery and offers instantaneous response to dynamic audio signals. The Evolution 600 is equipped with advanced thermal management systems that keep the unit cool during extended use, ensuring reliability and longevity. Furthermore, the elegant design complements any home decor, making it a stylish and functional addition to high-end audio environments.

The Evolution 400, while slightly smaller, exemplifies Krell’s hallmark of uncompromising sound quality. It integrates many of the same high-end technologies found in its larger counterparts but in a more compact form. With a focus on delivering dynamic range and clarity, the Evolution 400 is ideal for both music and home theater applications. Advanced digital signal processing, combined with analog audio circuitry, ensures that every note and detail is captured with impeccable accuracy.

All three models prioritize connectivity and user experience, featuring a range of inputs, including balanced XLR and unbalanced RCA options, allowing seamless integration into various audio systems. Each amplifier emphasizes robust build quality, featuring heavy-duty chassis and meticulously designed circuit layouts to minimize interference and signal degradation.

In conclusion, Krell Industries’ 900, Evolution 600, and Evolution 400 amplifiers exemplify the pinnacle of audio craftsmanship. They combine innovative technologies, premium components, and stunning aesthetics, making them the perfect choice for discerning audio enthusiasts who demand nothing but the best in sound reproduction.