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Krell Industries Evolution One - page 1
OWNER’S REFERENCE EVOLUTION ONE MONAURAL POWER AMPLIFIER EVOLUTION ...
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Krell Industries Evolution One - page 2
Evolution One Monaural Power Amplifier Owner’ s Reference, v 05.0 Kr ell Industries, Inc. 45 Connair Road Orange, CT 06477 -3650 USA TEL 203 -799 -9954 F AX 203 - 891 -2028 E-MAIL krell@kr ellonline.com WEBSITE http://www .krellonline.com This product complies with the EMC dir ective (89 / 33 6/ EEC) and the low-voltage directive (73/ 23/ EEC). W ...
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Krell Industries Evolution One - page 3
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 T echnology , Ensuring Maximum Per formance, and Definition of T erms SECTION TWO: Unpacking and Placement, page 12 Opening the Evolution One Shipping Car tons SECTION THREE: Anatomy of an ...
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Krell Industries Evolution One - page 4
iv List of Illustrations Figure 1, page 1 5 Evolution One Amplifier and Power Supply Chassis Front Panels Inset Evolution One Amplifier Channel: Front Panel View Figure 2, page 1 6 Evolution One Amplifier and Power Supply Chassis Back Panels Figur e 3, page 1 7 Evolution One Amplifier Chassis T op Figur e 4, page 1 8 Evolution One Power Supply Chas ...
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Krell Industries Evolution One - page 5
continue d A Letter fr om Dan D’Agostino Dear Audio Enthusiast, Thank you for your purchase of the Evolution One. The Evolution One Monaural Power Amplifier repr esents a watershed in my design philosophy and in my quest for amplifiers that deliver absolute truth in music repr oduction. This new amplifier operates solely in the current domain, wi ...
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Krell Industries Evolution One - page 6
I have some exciting news for you. W ork 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 r ecording formats while taking compact disc playback to the next le ...
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Krell Industries Evolution One - page 7
continue d SECTION ONE About Kr ell This section describes the Krell Legacy , innovative Krell amplifier design and technol- ogy , and defines key terms used in this r eference. The Kr ell Legacy “ I design every Krell component to set the standard for workmanship, style, and performance.” Dan D’Agostino High-end audio is a demanding pursuit ...
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Krell Industries Evolution One - page 8
From the KSA –1 00 to the present, Kr ell C.E.O. Dan D’Agostino has continually “pushed the envelope” of performance in his search for gr eater amplifier power . His exploration of new technologies, driven by his never -ending quest to elevate the standard of excellence, has r esulted in breakthr ough audio designs. Over the years, the Krel ...
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Krell Industries Evolution One - page 9
continue d 5 Revolutionary Kr ell CAST T echnology Current Audio Signal T ransmission, termed CAST , is a revolutionary method of con- necting analog audio components for unparalleled sonic performance. Innovative engineering combines the new Krell CAST cir cuitry with existing Krell Curr ent Mode technology to create entir e CAST systems that repr ...
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Krell Industries Evolution One - page 10
6 (How CAST and Kr ell Current Mode Interact continued) CAST preserves the transmitted signal between components. T ogether , CAST and Krell Curr ent Mode technologies unify separate Krell components into a single global circuit. Krell Curr ent Mode technology enjoys bandwidth increases up to an order of magnitude gr eater than their voltage based ...
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Krell Industries Evolution One - page 11
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 foundation of huge, regulated power suppli ...
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Krell Industries Evolution One - page 12
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 extr emely wide bandwidth and very high current capability . The amplifier does not employ global negative feedback—the final gain stages use only 8 dB of local, nested negative feedback. This i ...
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Krell Industries Evolution One - page 13
continue d 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 cir cuitry filters RF noise on the AC mains, as well as compensating for asymm ...
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Krell Industries Evolution One - page 14
Definition of T erms 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 fr om both input ter - minals to a common ground r eference point. The industry standar d for pr ofessional and sound recor ding installations, balanced ...
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Krell Industries Evolution One - 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 r eady to play music. T echnology Krell Curr ent Mode A proprietary Kr ell circuit topology in which the audio gain stages of a component operate in the curre ...
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Krell Industries Evolution One - page 16
12 Unpacking and Placement This section describes the procedur es for safely unpacking and placing your Evolution One Monaural Power Amplifier . Ea ch Ev ol uti on On e a mp li fie r c ha nn el is shipped in 2 cartons: a power supply chassis in 1 carton and an amplifier chassis in the other carton. Opening the Amplifier Shipping Carton Each Evoluti ...
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Krell Industries Evolution One - page 17
13 3. Simultaneously grasp the pair of cardboar d handle cutouts at the front and back of the carton and lift the chassis straight up out of the carton. 2 people needed 4. Place the chassis in a safe location and remove the pr otective plastic wrapping. 2 people needed 5. Open the remaining 3 cartons of the Evolution One, using steps 1-4 above as a ...
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Krell Industries Evolution One - page 18
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-fr ee installation. Each Evolution One amplifier requir es at least two inches (5 cm) of clearance on each side and at least eight inches (20 cm) of clearance ...
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Krell Industries Evolution One - page 19
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 Chassis 3 Power/Stand-by Button 4 Power/Stand-by LED 5 Backlight 6 Power Meter Scale 7 Power Meter W and 8 CAST LED 9 50 W Scale LED 10 5000 W ...
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Krell Industries Evolution One - page 20
Figure 2 Evolution One Amplifier and Power Supply Chassis Back Panels 16 15 Balanced Input 16 CAST Input 17 Amplifier Binding Posts 18 RC-5 Input 19 12 V T rigger In/Out 20 IEC Power Cord Receptacle 21 Power Breaker Switch IN IN OUT MADE IN USA NO USER SERVICEABLE PARTS INSIDE KRELL INDUSTRIES, INC. 45 CONNAIR ROAD ORANGE, CT 06477-3650 USA EVOLUTI ...
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Krell Industries Evolution One - page 21
17 Figure 3 Evolution One Amplifier Chassis T op 17 Amplifier Binding Posts 22 Amplifier Fr ont 17 22 continue d ...
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Krell Industries Evolution One - page 22
18 ( SECTION THREE: Anatomy of an Amplifier continued) Figure 4 Evolution One Power Supply Chassis T op 23 Locating Pin 24 Power Connector 25 Power Supply Fr ont 23 24 23 25 ...
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Krell Industries Evolution One - page 23
19 SECTION FOUR Connecting the Evolution One to Y our System This section describes Evolution One amplifier connections and outlines remote control o ptions. Each Evolution One has a CAST 4-pin connector , a balanced input via an XLR connector , a 12 V olt trigger In/Out connection, and an RC-5 in put o n the back panel. CAST Connections Krell r ec ...
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Krell Industries Evolution One - page 24
( SECTION FOUR: Connections, continued ) 20 3. Connect the Krell CAST cables fr om your CAST -enabled preamplifier or source component to the left and right Kr ell CAST 4-pin bayonet inputs (16) on the amplifier (1) back panel. For balanced operation, connect the intercon- nect cable from your pr eamplifier to the balanced XLR input (15) on the amp ...
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Krell Industries Evolution One - page 25
21 Remote Contr ol Options The Evolution One amplifier is compatible with the remote contr ols included with the Krell Evolution T wo preamplifier , other Kr ell preamplifiers or pr eamplifier/ processors, and it is compatible with the Universal Kr ell T ouch Screen Remote. Please contact your authorized Krell dealer , distributor , or Krell, if yo ...
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Krell Industries Evolution One - page 26
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 r ecording device) without muting the preamplifier output, or bumping or miscuing a sour ce can generate lar g ...
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Krell Industries Evolution One - page 27
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. Y ou may now switch between CAST and balanced operation. For mor ...
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Krell Industries Evolution One - page 28
Adjusting Power Meter Modes The Evolution One amplifier uses micropr ocessors to monitor RMS output voltage and current signals. This information is output to a custom fr ont panel power meter (6) (7), which displays an accurate power measurement for the selected meter range on the power meter scale (6). The power meter has 4 modes of opera- tion a ...
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Krell Industries Evolution One - page 29
Amplifier Car e An Evolution One amplifier is capable of enormous power output, and it is impor- tant to exercise car e during system operation. Avoid an y a cti on tha t c an g ene rat e lar ge transient signals. Always mute the prea mpl ifi er out put be for e sw itc hin g between active sources or cuing an LP . Do not change inputs to the amplif ...
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Krell Industries Evolution One - page 30
Amplifier T r oubleshooting System Pr otection 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 circuitry constantly evaluates the operation of t ...
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Krell Industries Evolution One - page 31
Diagnostic Codes Possible Condition Course of Action 1 flash, pause, 2 flashes, Amplifier is over Allow the amplifier repeat; then the amplifier temperature to cool. When the LEDs reverts to stand-by mode stop flashing, the ampli- fier has cooled down. flash, pause, 5 flashes, Short cir cuit Check all connections repeat; then the amplifier on outpu ...
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Krell Industries Evolution One - page 32
28 W arranty Each Evolution Series amplifier has a limited warranty of five years for parts and lab or on ci rc ui try . Should this pr oduct fail to perform at any time during the warran- ty , Kr ell w ill r epa ir it at no cost to the owner , except as set forth in th is wa rranty . This warranty does not apply to damage caused by acts of God or ...
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Krell Industries Evolution One - page 33
29 Krell will pay r eturn freight to the U .S . A .-based freight forwar der of your choice. Freight and other char ges to ship the unit from the freight forwar der to you are also your responsibility . Krell is not r esponsible for any damage incurred in transit. Kr ell will file claims for damages as necessary for units damaged in transit to the ...
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Krell Industries Evolution One - page 34
Retur n Authorization Pr ocedur e 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 . T o expedite service, you may wish to complete and e-mail the Service Request Form in the Service Section of our website at: http ...
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Krell Industries Evolution One - page 35
Specifications Frequency r esponse 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 T otal 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 Input sensitivity Balanced: 3.08 V RMS CAST : 3.0 ...
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