EVOLUTION EVOLUTION 302e, 403e AND 400e, e SERIES AMPLIFIERS 402e AND 3250e 600e AND OWNER’S 2250e STEREO THREE-CHANNEL 900e MONAURAL REFERENCE KRELL THE LEADER IN AUDIO ENGINEERING
Evolution 302e, 402e, 2250e, 403e, 3250e, 400e 600e and 900e Power Amplifiers Owner’s Reference, V1.0 TELL 203-298-4000 Krell Industries, LLC 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). This CLASS 1 apparatus must be connected to a MAINS socket outlet with a protective earthing connection. IMPORTANT SAFETY INSTRUCTIONS 1.
Contents List of Illustrations, page 4 A Letter from Krell, page 5 SECTION ONE: Evolution e Series Amplifier Features and Technology, page 6 Features, Revolutionary Krell CAST Technology, Definition of Terms SECTION TWO: Unpacking and Placement, page 11 Opening the Evolution e Series Amplifier Shipping Carton SECTION THREE: Anatomy of the Evolution e Series Amplifier, page 13 Front Panel Description, and Back Panel Description SECTION FOUR: Connecting an Evolution e Series Amplifier to Your System, pa
List of Illustrations Figure 1, page 13 Evolution e Series Amplifier Front Panel Figure 2, page 15 Evolution 302e Back Panel Figure 3, page 16 Evolution 402e Back Panel Figure 4, page 17 Evolution 403e Back Panel Figure 5, page 18 Evolution e Series Monaural Amplifier Back Pane Figure 6, page 20 Evolution 2250e Back Panel FIgure 7, page 21 Evolution 3250e Back Panl Figure 8, page 28 Connection Diagram 4
A Letter from Krell Industries Dear Audio Enthusiast, Thank you for your purchase of a Krell Evolution e Series amplifier. No component in an audio system contributes more to the full range of musical expression than a power amplifier. The seemingly impossible tasks of simultaneously conveying music's subtle emotional cues and intense dynamic passages rest squarely on its shoulders. In our quest for amplifiers that deliver absolute truth in music reproduction, we present the Evolution e Series.
SECTION ONE Evolution e Series Amplifier Features and Technology This section describes the innovative features and technology of the Evolution e Series amplifiers, and defines CAST and other key terms used in this reference.
Revolutionary Krell CAST Technology Current Audio Signal Transmission, termed CAST, is a revolutionary method of connecting 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.
(SECTION ONE: Evolution e Series Amplifier Features and Technology continued) Krell Current Mode maintains the integrity of the signal within the component and 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.
Definition of Terms The following are definitions of key terms used in this owner’s reference: Inputs and Outputs Balanced A symmetrical input or output circuit that has equal impedance from both input terminals to a common ground reference point. The industry standard for professional and sound recording installations, balanced connections have 6 dB more gain than singleended connections and allow the use of long interconnect cables.
(SECTION ONE: Definition of Terms continued) Technology Active Cascode Topology A unique circuit technique that minimizes distortion by applying from 2 to 3 times more active devices to each gain stage thereby reducing the load on individual devices and improving circuit-wide linearity. Krell Current Mode A proprietary Krell circuit topology in which the audio gain stages of a component operate in the current domain rather than the voltage domain.
TWO SECTION Unpacking and Placement This section describes the procedures for safely unpacking and placing your Evolution e Series amplifier. The amplifier and accessories are shipped in 1 carton. The dimensions of the amplifier are shown in the specifications section starting on page 30. Two people are needed to remove the Evolution e Series amplifier from its shipping box safely and easily. Opening the Evolution e Series Amplifier Shipping Carton 1.
(SECTION TWO: Unpacking and Placement continued) Placement Before you install an Evolution e Series amplifier into your system, please follow the guidelines in this section to select a location for your component. This will facilitate a clean, trouble-free installation. Place the amplifier on a firm, level surface, away from excessive heat, humidity, or moisture.
SECTION THREE Anatomy of an Evolution e Series Amplifier This section describes Evolution e Series amplifier functions.
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Front Panel Description See Figure 1 on the previous page Power Evolution e Series amplifier front panel functions are described below: 1 Power Button Press this button to place the Evolution e Series amplifier in operational mode. 2 Power Status Indicator The power status indicator is illuminated in either green or red when the amplifier is in stand-by mode.
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 2 Evolution 302e Stereo Amplifier Back Panel e KRELL INDUSTRIES, LLC 45 CONNAIR ROAD ORANGE, CT 06447-3650 USA 3400 W max Outputs Inputs Remote Power 3 4 5 6 7 8 9 10 Loudspeaker Binding Posts Single-ended Inputs CAST Inputs Balanced Inputs 12 VDC Out/In (12 V Trigger) Backlight Control IEC Power Cord Receptacle Power Breaker Switch 15 continued
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 3 Evolution 402e Stereo Amplifier Back Panel 4 5 4 5 6 7 8 3800 W max e KRELL INDUSTRIES, LLC 45 CONNAIR ROAD ORANGE, CT 06447-3650 USA 3 Outputs Inputs Remote Power 3 4 5 6 7 8 9 10 10 9 Loudspeaker Binding Posts CAST Inputs Single-ended Inputs Balanced Inputs 12 VDC Out/In (12 V Trigger) Backlight Control IEC Power Cord Receptacle Power Breaker Switch 16 continued
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 4 Evolution 403e Multi-channel Amplifier Back Panel 5000 W max e KRELL INDUSTRIES, LLC 45 CONNAIR ROAD ORANGE, CT 06447-3650 USA Outputs Inputs Remote Power 3 4 5 6 7 8 9 10 Loudspeaker Binding Posts CAST Inputs Single-ended Inputs Balanced Inputs 12 VDC Out/In (12 V Trigger) Backlight Control IEC Power Cord Receptacle Power Breaker Switch 17 continued
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 5 Evolution 400e Monaural Amplifier Back Panel e LLC 2500 W max Outputs Inputs Remote Power 3 4 5 6 7 8 9 10 Loudspeaker Binding Posts CAST Input Single-ended Input Balanced Input 12 VDC Out/In (12 V Trigger) Backlight Control IEC Power Cord Receptacle Power Breaker Switch 18 continued
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 5 Evolution e Series Monaural Amplifier Back Panel (Evolution 600e shown) 4 5 6 7 8 3800 W max e KRELL INDUSTRIES, LLC 45 CONNAIR ROAD ORANGE, CT 06447-3650 USA 10 3 Outputs Inputs Remote Power 3 4 5 6 7 8 9 10 9 Loudspeaker Binding Posts CAST Input Single-ended Input Balanced Input 12 VDC Out/In (12 V Trigger) Backlight Control IEC Power Cord Receptacle Power Breaker Switch 19 continued
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 6 Evolution e Series Stereo Amplifier Back Panel (Evolution 2250e shown) Outputs Inputs Remote Power 3 Loudspeaker Binding Posts 4 Single-ended Input 5 Balanced Input 9 XLR/Sinlge-ended Selector Switch 6 12 VDC Out/In (12 V Trigger) 7 IEC Power Cord Receptacle 8 Power Breaker Switch 10 Speaker Fuses 20
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Figure 7 Evolution e Series Three Channel Amplifier Back Panel (Evolution 3250e shown) Outputs Inputs Remote Power 3 Loudspeaker Binding Posts 4 Single-ended Input 5 Balanced Input 9 XLR/Sinlge-ended Selector Switch 6 12 VDC Out/In (12 V Trigger) 7 IEC Power Cord Receptacle 8 Power Breaker Switch 10 Speaker Fuses 21
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Back Panel Description See Figure 2, 3, 4 and 5 on the previous pages The amplifier back panel provides access to the input and output connections, 12 V trigger inputs and outputs, and the AC power connection and switch. Back panel features and their descriptions follow: Outputs 3 Loudspeaker Binding Posts (one pair per channel) Each channel has one positive and one negative binding post. They accept spade lugs only.
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) 8 Backlight Control Ext In. Connect a 12 V trigger to the Ext In input connector to turn off the power status indicator (2) using a remote control. The switch must be set to On/Ext, in order for this to function (see below). On/Ext. This activates the power staus indicator. (This is the factory default position.) Power Off. This turns off the power status indicator, during normal operation.
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Back Panel Description See Figure 6 and 7 on the previous pages The amplifier back panel provides access to the input and output connections, 12 V trigger inputs and outputs, and the AC power connection and switch. Back panel features and their descriptions follow: Outputs 3 Loudspeaker Binding Posts (one pair per channel) Each channel has one positive and one negative binding post. They accept spade lugs only.
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued) Power 7 IEC Power Cord Receptacle The power receptacle is for use with the provided 20 amp AC power cord. Use only the power cord supplied with your Evolution e Series amplifier. 8 Power Breaker Switch Place this switch in the up position to put the amplifier in stand-by mode. Place the switch in the down position to turn off the amplifier.
SECTION FOUR Connecting an Evolution e Series Amplifier to Your System This section describes Evolution e Series amplifier connections. Each Evolution e Series 302e, 402e, 403e, 400e, 600e, and 900e amplifier channel has a CAST 4-pin connector, a balanced input via an XLR connector, a single-ended RCA connector, and a pair of loudspeaker binding posts. The rear panel also has 12 VDC trigger input and outputs, and a backlight remote trigger input.
(SECTION FOUR: Connecting an Evolution e Series Amplifier to Your System continued) Evolution DC Protection Circuitry/Using Tube Preamplifiers The high DC output of tube preamplifiers may exceed the active DC protection circuitry of the Evolution e Series amplifiers. Excessive DC level in a signal can damage amplifiers, loudspeakers, or both. The single-ended inputs of the Evolution e Series amplifiers are capacitor-coupled and DC does not pass through.
(SECTION FOUR: Connecting an Evolution e Series Amplifier to Your System continued) Figure 8 Connection Diagram 28
SECTION FIVE Evolution e Series Amplifier Operation The Evolution e Series amplifiers are easy to operate. IMPORTANT When powering up any system, turn the amplifier on last. When powering down, turn it off first. This will prevent any turn-on and turn-off thumps in your loudspeakers. Always mute or fully attenuate the preamplifier level when switching sources. Do not change input connections to the amplifier when the amplifier is on.
SECTION SIX Troubleshooting System Noise AC grounding becomes critical when connecting high-performance audio components. When you mix and match high-performance audio components, each with its own ground potential, a low frequency hum may occur in one or both loudspeakers. This often occurs when introducing a new component into a system. If this happens when you place the Evolution e Series amplifier into your system, follow these simple troubleshooting steps.
(SECTION SIX: Troubleshooting continued) Error Codes In the event of a problem, the power status indicator (2) will flash error code(s) in red. Errors are identified by a sequence flashes. There is a pause between codes, and in the case where there is only one error code, the same code is repeated.
SECTION SEVEN Questions and Answers Q. Should I leave my Evolution e Series amplifier on at all times? A. For maximum amplifier performance, leave the back panel power breaker switch on at all times. This places the amplifier in stand-by mode. Evolution e Series amplifiers are designed to be powered on and off from stand-by, using the front panel power button. Q. When I turn on the amplifier there is a loud hum through the loudspeakers. What should I do? A.
Warranty Krell products have a limited warranty. Amplifiers, preamplifiers, preamp/processors, and receivers carry a limited warranty of five years from date of purchase or six years from date of manufacture for parts and labor on circuitry. Loudspeakers carry a limited warranty of five years from date of purchase or six years from date of manufacture for parts and labor.
If the product is serviced by a distributor who did not import the unit, there may be a charge for service, even if the product is within the warranty period. Freight to the factory is your responsibility. Return freight within the United States (U.S.A.) is included in the warranty. If you have purchased your Krell product outside the U.S.A. and wish to have it serviced at the factory, all freight and associated charges to the factory are your responsibility. Krell will pay return freight to the U.S.A.
Return Authorization Procedure How to Expedite Service 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 the Service section of our website at: http://www.krellonline.
Specifications Measurement FREQUENCY RESPONSE SIGNAL-TO-NOISE RATIO Wideband, unweighted, referred to full power output “A” weighted GAIN TOTAL HARMONIC DISTORTION INPUT IMPEDANCE Single-ended Balanced CAST INPUT SENSITIVITY Single-ended or balanced CAST OUTPUT POWER All channels driven OUTPUT VOLTAGE OUTPUT CURRENT SLEW RATE OUTPUT IMPEDANCE DAMPING FACTOR Referred to 8 Ohms POWER CONSUMPTION Stand-by High Current Stand-by Idle Maximum HEAT OUTPUT Evolution 302e Amplifier Evolution 402e Amp
(Specifications continued) Measurement FREQUENCY RESPONSE SIGNAL-TO-NOISE RATIO Wideband, unweighted, referred to full power output “A” weighted GAIN TOTAL HARMONIC DISTORTION INPUT IMPEDANCE Single-ended Balanced CAST INPUT SENSITIVITY Single-ended or balanced CAST OUTPUT POWER Evolution 403e Amplifier Evolution 400e Monaural Amplifier >106 dB >108 dB 20 Hz to 20 kHz +0, –0.18 dB <0.5 Hz to 120 kHz +0, –3 dB >116 dB 20 Hz to 20 kHz +0, –0.18 dB <0.5 Hz to 125 kHz +0, –3 dB >118 dB 25.
(Specifications continued) Measurement FREQUENCY RESPONSE SIGNAL-TO-NOISE RATIO Wideband, unweighted, referred to full power output “A” weighted GAIN TOTAL HARMONIC DISTORTION INPUT IMPEDANCE Single-ended Balanced CAST INPUT SENSITIVITY Single-ended or balanced CAST OUTPUT POWER Evolution 600e Monaural Amplifier Evolution 900e Monaural Amplifier 20 Hz to 20 kHz +0, –0.18 dB <0.5 Hz to 120 kHz +0, –3 dB 20 Hz to 20 kHz +0, –0.18 dB <0.5 Hz to 120 kHz +0, –3 dB >119 dB >122 dB >110 dB 25.
(Specifications continued) Measurement FREQUENCY RESPONSE SIGNAL-TO-NOISE RATIO Wideband, unweighted, referred to full power output “A” weighted GAIN TOTAL HARMONIC DISTORTION INPUT IMPEDANCE Single-ended Balanced INPUT SENSITIVITY Single-ended or balanced OUTPUT POWER OUTPUT VOLTAGE OUTPUT CURRENT SLEW RATE OUTPUT IMPEDANCE DAMPING FACTOR Referred to 8 Ohms POWER CONSUMPTION Evolution 2250e Amplifier 20 Hz to 20 kHz +0, –0.07 dB <0.
EVOLUTION e SERIES AMPLIFIERS 302e AND 403e 402e STEREO THREE-CHANNEL 600e AND 900e OWNER’S V MONAURAL REFERENCE 1.0 KRELL INDUSTRIES, 45 CONNAIR ORANGE, TELL: CT 06477-3650 203-298-4000 E-MAIL: ROAD • FA X : LLC USA 203-891-2028 sales@krellonline.com h t t p : / / w w w. k r e l l o n l i n e .
