Krell Industries Evolution One Owner's Reference Manual
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Krell Industries Evolution One Owner's Reference Manual

Monaural power amplifier
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EVOLUTION
E V O L U T I O N
O N E
M O N A U R A L
P O W E R
A M P L I F I E R
O W N E R ' S
R E F E R E N C E

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Summary of Contents for Krell Industries Evolution One

  • Page 1 EVOLUTION E V O L U T I O N O N E M O N A U R A L P O W E R A M P L I F I E R O W N E R ’ S R E F E R E N C E...
  • Page 2 Do not connect the negative speaker terminals together. Do not connect the negative speaker terminals to ground. Do not connect an Evolution One Monaural Power Amplifier to a loudspeaker selector device that employs a common ground scheme, as it may short-circuit the amplifier output.

  • Page 3: Table Of Contents

    SECTION THREE: Anatomy of an Amplifier, page 15 Features and Benefits of the Evolution One Design SECTION FOUR: Connecting an Evolution One Amplifier to Your System, page 19 CAST and Voltage Connections, Connection Steps, DC Protection Circuitry, and Remote Control Options...

  • Page 4: List Of Illustrations

    List of Illustrations Figure 1, page 15 Evolution One Amplifier and Power Supply Chassis Front Panels Inset Evolution One Amplifier Channel: Front Panel View Figure 2, page 16 Evolution One Amplifier and Power Supply Chassis Back Panels Figure 3, page 17...

  • Page 5: A Letter From Dan D'agostino

    As the foundation of my new Evolution Series, the Evolution One Monaural Power Amplifier is designed to complement the Evolution Two Monaural Power Preamplifier perfectly. Combine the Evolution One and Two with my new LAT-1000 loudspeakers, and experience the extraordinary capabilities of the Evolution System.
  • Page 6 (A Letter from Dan D’Agostino continued) I have some exciting news for you. Work on a new source component for the Evolution Series is ongoing as of this writing. Possessed of the unique Evolution technologies that power the amplifier and preamplifier, this Evolution source will expose the real advantages of the latest recording formats while taking compact disc playback to the next level.
  • Page 7 The most discriminating audiophiles and product reviewers have consistently recognized Krell components for standard-setting performance. The Evolution One amplifier brings Krell design to a new level, setting a standard for performance that will not soon be matched. The shear breadth of this amplifier’s dynamic range capabilities conveys a startling realism that transcends previous designs.

  • Page 8: Section One: About Krell

    Krell component upholds the legacy, incorporating unique technologies that are the direct result of Dan’s discoveries in audio amplification. The Evolution One amplifiers build on the Krell legacy. They provide unprecedent- ed linearity with the control and accuracy that only comes from superior current capability.

  • Page 9: Revolutionary Krell Cast Technology

    Revolutionary Krell CAST Technology Current Audio Signal Transmission, termed CAST, is a revolutionary method of con- necting analog audio components for unparalleled sonic performance. Innovative engineering combines the new Krell CAST circuitry with existing Krell Current Mode technology to create entire CAST systems that reproduce music with incredible range, tonality, and precision.
  • Page 10 (SECTION ONE: About Krell continued) (How CAST and Krell Current Mode Interact continued) CAST preserves the transmitted signal between components. Together, CAST and Krell Current Mode technologies unify separate Krell components into a single global circuit. Krell Current Mode technology enjoys bandwidth increases up to an order of magnitude greater than their voltage based counterparts.
  • Page 11 Evolution One Amplifier, and fuels the ongoing Evolution design effort at Krell.” The Krell Evolution One Monaural Power Amplifier, built upon the foundation of huge, regulated power supplies and output stages, is designed to drive any loudspeaker with complete control. The product of breakthrough Krell technolo- gy, this amplifier provides a sound that is supremely dynamic and musical.
  • Page 12 The resulting wide bandwidth and low output imped- ance of the Evolution One surpasses even the stringent demands of the amplifier output stages. The driver and output stages in the high current regulators use 14 pairs of the same robust, high performance power transistors used in the amplifier output stages.
  • Page 13 Separate Power Supplies Are Quiet and Powerful Housed in a separate chassis, the power supply makes use of extensive electri- cal and magnetic shielding to keep radiated interference out of critical amplifier circuits. Internal high current line conditioning circuitry filters RF noise on the AC mains, as well as compensating for asymmetric power waveforms and DC on the mains.

  • Page 14: Definition Of Terms

    (SECTION ONE: About Krell continued) Definition of Terms Following are the definitions of key terms used in your owner’s reference manual. Inputs and Outputs Balanced A symmetrical input or output circuit that has equal impedance from both input ter- minals to a common ground reference point. The industry standard for professional and sound recording installations, balanced connections have 6 dB more gain than single-ended connections and allow the use of long interconnect cables.
  • Page 15 (Operation continued) Operational Mode When the power/stand-by LEDs (4), the backlight (5), and the power meter scale (6) are illuminated in blue, the amplifier is in the operational mode and ready to play music. Technology Krell Current Mode A proprietary Krell circuit topology in which the audio gain stages of a component operate in the current rather than voltage domain.

  • Page 16: Unpacking And Placement

    Opening the Amplifier Shipping Carton Each Evolution One shipping carton measures 27.5 in. (69.9 cm) wide by 12 in. (30.5 cm) high by 20.8 in. (52.8 cm) deep and contains 1 amplifier power supply chassis or 1 amplifier chassis.
  • Page 17 Place the chassis in a safe location and remove the protective plastic wrapping. 2 people needed Open the remaining 3 cartons of the Evolution One, using steps 1-4 above as a guide. 2 people needed Place the power supply chassis where you intend to use the assembled ampli- fier channel.

  • Page 18: Section Two: Unpacking And Placement

    (SECTION TWO: Unpacking and Placement continued) Placement Before you install an Evolution One amplifier into your system, please follow the guidelines in this section to choose its proper location. This will facilitate a clean, trouble-free installation. Each Evolution One amplifier requires at least two inches (5 cm) of clearance on each side and at least eight inches (20 cm) of clearance above the compo- nent to provide adequate ventilation.
  • Page 19 THREE SECTION Anatomy of an Amplifier This section describes Evolution One features and benefits. Figure 1 Evolution One Amplifier and Power Supply Chassis Front Panels CAST POWER 1 Amplifier Chassis 2 Power Supply Chassis 3 Power/Stand-by Button 4 Power/Stand-by LED...

  • Page 20: Section Three: Anatomy Of An Amplifier

    (SECTION THREE: Anatomy of an Amplifier continued) Figure 2 Evolution One Amplifier and Power Supply Chassis Back Panels NO USER SERVICEABLE PARTS INSIDE 15 Balanced Input 16 CAST Input 17 Amplifier Binding Posts 18 RC-5 Input 19 12 V Trigger In/Out...
  • Page 21 Figure 3 Evolution One Amplifier Chassis Top 17 Amplifier Binding Posts 22 Amplifier Front continued...
  • Page 22 (SECTION THREE: Anatomy of an Amplifier continued) Figure 4 Evolution One Power Supply Chassis Top 23 Locating Pin 24 Power Connector 25 Power Supply Front...

  • Page 23: Balanced Connections

    Your System This section describes Evolution One amplifier connections and outlines remote control options. Each Evolution One has a CAST 4-pin connector, a balanced input via an XLR connector, a 12 Volt trigger In/Out connection, and an RC-5 input on the back panel.
  • Page 24 If a CAST and balanced source are connected to the amplifier during the initial installa- tion, the Evolution One amplifier defaults to CAST, when it is powered on. If only one source is connected, the amplifier will automatically select that source. For more informa- tion, see Switching Between CAST and Balanced Inputs, on page 23.

  • Page 25: Remote Control Options

    RC-5 Remote Control Each Evolution One amplifier has an RC-5 remote input (18) on the back panel. The RC-5 remote input accepts a remote command enabling it to switch between stand-by and operational modes and to switch between CAST and bal- anced inputs.

  • Page 26: Amplifier Operation

    SECTION Amplifier Operation Evolution One amplifiers are easy to operate. However, it is important to exer- cise care during operation due to the enormous power output of each amplifier. Switching between active sources (such as a CD player or a recording device) without muting the preamplifier output, or bumping or miscuing a source can generate large transients at low frequencies.
  • Page 27 Switching Between CAST and Balanced Inputs If a CAST and balanced source are connected during the initial installation, see Cable Connection Steps, pages 19-20, the Evolution One defaults to CAST and the CAST LED illuminates in blue when the amplifier is powered on.

  • Page 28: Section Five: Amplifier Operation

    (SECTION FIVE: AMPLIFIER OPERATION continued) Adjusting Power Meter Modes The Evolution One amplifier uses microprocessors to monitor RMS output voltage and current signals. This information is output to a custom front panel power meter (6) (7), which displays an accurate power measurement for the selected meter range on the power meter scale (6).

  • Page 29: Amplifier Care

    Amplifier Care An Evolution One amplifier is capable of enormous power output, and it is impor- tant to exercise care during system operation. Avoid any action that can generate large transient signals. Always mute the preamplifier output before switching between active sources or cuing an LP. Do not change inputs to the amplifiers while the amplifiers are on.

  • Page 30: Amplifier Troubleshooting

    Amplifier Troubleshooting System Protection Each Evolution One amplifier has a built-in DC monitor that continuously moni- tors the audio signal at the input, as well as other sophisticated protection cir- cuits that monitor other areas of the topology, in order to safeguard the amplifier.
  • Page 31 Evolution One amplifiers report operational issues by flashing the power/stand-by LEDs (4) in red, in a specific sequence, or by tripping the rear panel breaker (21), as follows: Diagnostic Codes Possible Condition 1 flash, pause, 2 flashes, Amplifier is over repeat;...

  • Page 32: Warranty

    Warranty Each Evolution Series amplifier has a limited warranty of five years for parts and labor on circuitry. Should this product fail to perform at any time during the warran- ty, Krell will repair it at no cost to the owner, except as set forth in this warranty. This warranty does not apply to damage caused by acts of God or nature.
  • Page 33 Krell will pay return freight to the U.S.A.-based freight forwarder of your choice. Freight and other charges to ship the unit from the freight forwarder to you are also your responsibility. Krell is not responsible for any damage incurred in transit. Krell will file claims for damages as necessary for units damaged in transit to the factory.

  • Page 34: Return Authorization Procedure

    To contact the Krell Service Department E-MAIL WEBSITE http://www.krellonline.com Evolution One PRODUCT To return a product to Krell, please follow this procedure so that we may serve you better: Obtain a Return Authorization Number (R/A number) and shipping address from the Krell Service Department.

  • Page 35: Specifications

    Specifications Frequency response 20 Hz to 20 kHz ±0.05 dB 0.6 Hz to 220 kHz +0, –3 dB Signal-to-noise ratio 118 dB, “A”-weighted Gain 25.8 dB Total harmonic distortion <0.01% at 1 kHz, at 450 W, 8 Ohms <0.1% at 20 kHz, at 450 W, 8 Ohms Input impedance Balanced: 100 kHz CAST: 50 Hz...

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