Krell Industries Evolution manual Important Safety Instructions

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

Owner’s Reference, v07.0

 

TEL 203-298-4000

Krell Industries, Inc.

FAX 203-891-2028

45 Connair Road

E-MAIL sales@krellonline.com

Orange, CT 06477-3650 USA

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 amplifier, and the space underneath every Evolution amplifier must be unob- structed 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 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 ResponseMeasurement Evolution 403 Amplifier Measurement Evolution 600 Amplifier Evolution 900 Amplifier WNER’S Reference Krell INDUSTRIES, INC

Evolution specifications

Krell Industries has established itself as a pioneer in high-performance audio equipment, renowned for delivering unparalleled sound quality and innovative technologies. Founded in 1980, the company quickly became synonymous with premium amplification, earning accolades from audiophiles worldwide. Over the years, Krell has evolved its product lineup to include not only amplifiers but also preamplifiers, digital audio players, and complete home theater systems.

One of the hallmark features of Krell products is their robust build quality. The company employs a strong engineering ethos that prioritizes durability and reliability in all its offerings. The iconic, heavy chassis of Krell components serves not only as a protective shell but also minimizes vibrations, which can adversely affect sound quality. This engineering strategy is evident in their signature line of amplifiers, which utilize high-grade materials and precision craftsmanship to ensure longevity and optimum performance.

Krell has also been at the forefront of technological advancements. The introduction of class A amplification circuitry is one such innovation that has been integral to the company's sound signature, allowing for minimal distortion and a rich, dynamic range. This technology ensures that even the most subtle nuances in music are reproduced with fidelity and clarity.

Moreover, Krell has embraced digital audio, creating DACs (digital-to-analog converters) and streaming devices that support high-resolution audio formats. This commitment to digital excellence reflects the company's understanding of evolving consumer preferences. Many of their devices feature wireless connectivity options, allowing users to stream music seamlessly from various sources without sacrificing audio quality.

In addition, Krell emphasizes user-friendly interfaces and versatility in its designs. Customers can often find features such as programmable presets, remote control functionality, and intuitive navigation systems, making it easier to tailor their listening experience.

Krell Industries’ evolution over the years showcases a dedication to audio fidelity, technological advancement, and stylish design. As the company continues to innovate within the high-end audio landscape, it maintains its reputation as a brand that audiophiles can trust, delivering exceptional sound experiences that stand the test of time.