Page 3 - Contents
1 iii Contents List of Illustrations, page iv A Letter from Dan D’Agostino, page 1 SECTION ONE: About Krell, page 3 The Krell Legacy, Revolutionary Krell CAST Technology, Ensuring Maximum Performance, and Definition of Terms SECTION TWO: Unpacking and Placement, page 12 Opening the Evolution One Shi...
Page 4 - List of Illustrations
iv 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 Evolution One Amplifier Chassis Top Figure...
Page 5 - A Letter from Dan D’Agostino
continued A Letter from Dan D’Agostino Dear Audio Enthusiast, Thank you for your purchase of the Evolution One. The Evolution One Monaural Power Amplifier represents a watershed in my design philosophy and in my quest for amplifiers that deliver absolute truth in music reproduction. This new amplifi...
Page 7 - ONE; About Krell; The Krell Legacy
continued SECTION ONE About Krell This section describes the Krell Legacy, innovative Krell amplifier design and technol- ogy, and defines key terms used in this reference. The Krell Legacy “I design every Krell component to set the standard for workmanship, style, and performance.” Dan D’Agostino H...
Page 9 - Revolutionary Krell CAST Technology; CAST Basics
continued 5 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 technolo...
Page 10 - CAST Cable Construction; Evolution CAST; The Best Musical Performance
6 (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...
Page 11 - Ensuring Maximum Performance; Core Technologies
7 Ensuring Maximum Performance “My pursuit of excellence in sound reproduction and my love of great musical performance has led me to the Evolution One Amplifier, and fuels the ongoing Evolution design effort at Krell.” Dan D’Agostino The Krell Evolution One Monaural Power Amplifier, built upon the ...
Page 12 - Impedance Advantage; Evolution Bias Control Systems
8 Impedance Advantage The output impedance of the final gain stages is one hundredth that of the final gain stage in most power amplifiers. This provides extremely wide bandwidth and very high current capability. The amplifier does not employ global negative feedback—the final gain stages use only 8...
Page 13 - Separate Power Supplies Are Quiet and Powerful
continued 9 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...
Page 14 - Definition of Terms; Inputs and Outputs; Operation
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 ...
Page 15 - Technology
(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 g...
Page 16 - Unpacking and Placement; Opening the Amplifier Shipping Carton; To Remove the Chassis from the Shipping Carton; TWO
12 Unpacking and Placement This section describes the procedures for safely unpacking and placing your Evolution One Monaural Power Amplifier. Each Evolution One amplifier channel is shipped in 2 cartons: a power supply chassis in 1 carton and an amplifier chassis in the other carton. Opening the Am...
Page 18 - Placement; AC Power Guidelines
14 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...
Page 19 - THREE; Anatomy of an Amplifier
15 SECTION THREE Anatomy of an Amplifier This section describes Evolution One features and benefits. Figure 1 Evolution One Amplifier and Power Supply Chassis Front Panels 1 Amplifier Chassis 2 Power Supply Chassis3 Power/Stand-by Button4 Power/Stand-by LED5 Backlight 6 Power Meter Scale 7 Power Met...
Page 23 - FOUR; CAST Connections; Balanced Connections; Cable Connection Steps
19 SECTION FOUR Connecting the Evolution One to 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 ...
Page 24 - DC Protection Circuitry / Using a Tube Preamplifier
( SECTION FOUR: Connections, continued ) 20 3. Connect the Krell CAST cables from your CAST-enabled preamplifier or source component to the left and right Krell CAST 4-pin bayonet inputs (16) on the amplifier (1) back panel. For balanced operation, connect the intercon- nect cable from your preampli...
Page 25 - Remote Control Options; 2 Volt Trigger
21 Remote Control Options The Evolution One amplifier is compatible with the remote controls included with the Krell Evolution Two preamplifier, other Krell preamplifiers or preamplifier/ processors, and it is compatible with the Universal Krell Touch Screen Remote. Please contact your authorized Kr...
Page 26 - Amplifier Operation; Powering On, Powering Down, and Powering Off; FIVE
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 b...
Page 27 - Switching Between CAST and Balanced Inputs
23 3. Press the power button (3), located underneath the far left edge of the amplifier chassis front panel. The power/stand-by LEDs (4) on the amplifier and power supply chassis illuminate in blue. The backlight (5) and the meter scale (6) on the amplifier chassis illuminate in blue. You may now sw...
Page 28 - Adjusting Power Meter Modes; Power Meter Range and Power Meter Wand Action
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 (...
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 no...
Page 30 - Amplifier Troubleshooting; System Protection; SIX
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. This circ...
Page 32 - Warranty
28 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 t...
Page 34 - Return Authorization Procedure
Return Authorization Procedure If you believe there is a problem with your component, please contact your dealer, distributor, or the Krell factory to discuss the problem before you return the component for repair. To expedite service, you may wish to complete and e-mail the Service Request Form in ...
Page 35 - Specifications
Specifications Frequency response20 Hz to 20 kHz ±0.05 dB0.6 Hz to 220 kHz +0, –3 dB Signal-to-noise ratio118 dB, “A”-weighted Gain25.8 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 impedanceBalanced: 100 kHzCAST: 50 Hz Input sensitivityB...
