Krell Industries 400, Evolution 600, 900 manual Important Safety Instructions

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Evolution 302, 402, 403, 400, 600 and 900 Power Amplifiers

Owner’s Reference, v08.0

Krell Industries, Inc.

TEL 203-298-4000

45 Connair Road

FAX 203-891-2028

Orange, CT 06477-3650 USA

E-MAIL sales@krellonline.com

 

WEBSITE http://www.krellonline.com

This product complies with the EMC directive (89/336/EEC) and the low-voltage directive (73/23/EEC).

IMPORTANT SAFETY INSTRUCTIONS

1.Read Instructions.

2.Keep these Instructions.

3.Heed all Warnings.

4.Follow all Instructions.

5.Do not use this apparatus near water.

6.Clean only with a dry cloth.

7.Do not install near any heat sources such as radiators, heat registers, stoves, or other appa- ratus (including amplifiers) that produce heat.

8.Unplug this apparatus during lightning storms or when unused for long periods of time.

9.Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as a power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

10.An Evolution amplifier must be placed on a firm, level surface where it is not exposed to drip- ping or splashing.

11.The ventilation grids on the top of every Evolution amplifier, the ventilation grids on the back of the Evolution 302 and 400 amplifiers, and the space underneath every Evolution amplifier must be unobstructed at all times during operation. Do not place flammable material above or beneath an Evolution amplifier.

12.Before making connections to an Evolution amplifier, ensure that the power is off and other com- ponents are in mute or stand-by mode. Make sure all cable terminations are of the highest quali- ty, free from frayed ends, short circuits, or cold solder joints.

13.THERE ARE NO USER SERVICEABLE PARTS INSIDE AN EVOLUTION AMPLIFIER.

Please contact Krell if you have questions not addressed in this guide.

This product is manufactured in the United States of America. Krell® is a registered trademark of Krell Industries, Inc., and is restricted for use by Krell Industries, Inc., its subsidiaries, and authorized agents. CAST™, Evolution CAST™, and Krell Current Mode™ are trademarks of Krell Industries, Inc. All other trademarks are registered to their respective companies.

© 2007 by Krell Industries, Inc. All rights reserved .

P/N 309888

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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 BasicsBest Musical Performance Cast Cable ConstructionEvolution Cast Operation Definition of TermsInputs and Outputs Active Cascode Topology Krell Current ModeTechnology 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 Inputs Back Panel DescriptionOutputs 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.