Krell Industries Evolution 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 a Krell Evolution Series amplifier.

Evolution Series amplifiers continue my quest for amplifiers that deliver absolute truth in music reproduction. These four new models utilize Active Cascode Topology, a unique circuit technique that minimizes distortion by applying from 2 to 3 times more active devices to each gain stage. Evolution Series amplifiers bring the real-life dynamics and transparency for which Krell is famous, to a whole new level.

Krell amplifiers are best known for their ability to drive any loudspeaker to sound its best, without regard to impedance or efficiency. I believe that linearity, an amplifier’s ability to output an exact duplicate of the input signal, is the ultimate measure of that amplifier’s work. At Krell, I drive amplifier designs toward the com- mon goal of linearity, through the rigorous application of Krell design principles that focus our efforts on four major performance factors: distortion, bandwidth, output impedance, and current capability. The Evolution Series amplifiers are a synthesis of these factors.

The Evolution Series amplifiers use Evolution CAST technology, for superior per- formance and very low noise.

I hope that you enjoy your new Evolution Series amplifier.

Sincerely,

Daniel D’Agostino

Chief Executive Officer

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Contents Evolution Important Safety Instructions Contents List of Illustrations Letter from Dan D’Agostino Features Evolution Amplifier Features and TechnologyHow Cast and Krell Current Mode Interact Voltage Signal Transmission Traditional Audio SystemRevolutionary Krell Cast Technology Cast BasicsBest Musical Performance Cast Cable ConstructionEvolution Cast Operation Definition of TermsInputs and Outputs Active Cascode Topology Krell Current ModeTechnology Opening the Evolution Amplifier Shipping Carton Unpacking and PlacementAC Power Guidelines PlacementEvolution Amplifier Front Panel Evolution 402 shown Anatomy of an Evolution AmplifierPower Button PowerPower Status Indicator 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 Power Breaker Switch IEC Power Cord ReceptacleRemote Connections VDC In/Out 12 V TriggerXLR Pin Configuration Connecting an Evolution Amplifier to Your SystemCast Connections Balanced ConnectionsConnection Steps Evolution DC Protection Circuitry/Using Tube PreamplifiersSection Five How to Evaluate Amplifier Operation Troubleshooting System NoiseDiagnostic Code Possible Condition Course of Action Error CodesQuestions and Answers Warranty Page How to Expedite Service Return Authorization ProcedureTo contact the Krell Service Department How to Return a ProductFrequency Response SpecificationsMeasurement 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.