EVOLUTION
KRELL
THE LEADER IN AUDIO ENGINEERING
EVOLUTION e SERIES AMPLIFIERS
302e, 402e AND 2250e STEREO
403e AND 3250e THREE-CHANNEL
400e, 600e AND 900e MONAURAL
OWNER’S REFERENCE
Evolution 302e, 402e, 2250e, 403e, 3250e, 400e 600e and 900e Power Amplifiers
Owner’s Reference, V1.0
TELL 203-298-4000
Krell Industries, LLC
45 Connair Road
Orange, CT 06477-3650 USA
FAX 203-891-2028
E-MAIL sales@krellonline.com
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. Read Instructions.
2. Keep these Instructions.
3. Heed all Warnings.
4. Follow all Instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce heat.
8. Unplug this apparatus during lightning storms or when unused for long periods of time.
9. Refer all servicing to qualified service personnel. Servicing is required when the apparatus
has been damaged in any way, such as a power-supply cord or plug is damaged, liquid has
been spilled or objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
10. An Evolution e Series amplifier must be placed on a firm, level surface where it is not exposed
to dripping or splashing.
11. The ventilation slots on the top of every Evolution e Series amplifier, the ventilation slots on the
back of the Evolution 302e and 400e amplifier, and the space underneath every Evolution e
Series amplifier must be unobstructed at all times during operation. Do not place flammable
material above or beneath an Evolution e Series amplifier
12. Before making connections to an Evolution e Series amplifier, ensure that the power is off and
other components are in mute or stand-by mode. Make sure all cable terminations are of the
highest quality, free from frayed ends, short circuits, or cold solder joints. Be especially careful
when connecting to terminals marked
which may have hazardous voltages on them during
operation.
13. THERE ARE NO USER SERVICEABLE PARTS INSIDE AN EVOLUTION AMPLIFIER.
Please contact Krell if you have questions not addressed in this guide.
.
This product is manufactured in the United States of
for use by Krell Industries, LLC, its subsidiaries, and authorized agents. CAST
trademarks of Krell Industries, LLC. All other trademarks are registered to their respective companies.
© 2010 by Krell Industries, LLC. All rights reserved
America. Krell
®
is a registered trademark of Krell Industries, LLC, and is restricted
™, Evolution CAST™, and Krell Current Mode™ are
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
SECTION THREE: Anatomy of the Evolution e Series Amplifier, page 13
SECTION FOUR: Connecting an Evolution e Series Amplifier to Your System, page 21
SECTION FIVE: Evolution e Series Amplifier Operation, page 23
SECTION SIX: T
SECTION SEVEN: Questions and Answers, page 26
WARRANTY, page 27
RETURN AUTHORIZATION PROCEDURE, page 29
TWO: Unpacking and Placement, page 11
Opening the Evolution e Series Amplifier Shipping Carton
Front Panel Description, and Back Panel Description
CAST Connections, Balanced Connections, Single-ended Connections,
Evolution DC Protection Circuitry/Using Tube Preamplifiers, Connection Steps
On/Off and Stand-by Operation
roubleshooting System Noise, page 24
How to Evaluate e Series Amplifier Operation, Error Codes
SPECIFICA
TIONS, page 30
3
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. This next generation of Evolution
Amplifiers, “e”, short for enhanced, represent a defining moment in Krell design, joining awesome
current capability with a newly refined, ultra-linear circuit topology and environmentally friendly
operation.
Krell amplifiers are best known for their ability to drive any loudspeaker to sound its best, without
regard to impedance, efficiency, or driver style. It is linearity, an amplifier's ability to output an exact
duplicate of the input signal, which is the ultimate measure of that amplifier’s worth. Krell designs
toward the common 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 e Series excels in each of these areas, delivering supreme accuracy
from whisper level to astounding, awe inspiring amounts of power with grace and elegance.
BETTER SOUND
Building on the unique Active Cascode Topology foundation of the Evolution Series, the e Series
amplifiers feature more precisely balanced current sharing among the seven sets of Active Cascode
Quartets that make up the output stage. This greater precision elevates an already impressive
performance envelope and provides greater amplifier reliability. Audible at all volume levels, this
improvement is independent of load current. Although negative feedback in the Evolution amplifiers
was already extremely low, a mere 14 dB several orders of magnitude lower than other
manufacturers' power amplifiers modifications to the feedback circuitry allow for more ideal
operation completely independent of the signal level. The results are greatly enhanced inner detail
and micro-dynamics with smoother high frequency response.
An intense upgrade to the power supply includes a number of improvements. There is now a
separate transformer for the digital power supplies. Not only does this facilitate greatly reduced
power consumption in standby, but it provides still better isolation between the digital and analog
power supplies. The high-current and high-voltage analog supplies have additional noise filtration
circuitry to reduce high-frequency switching noise from the rectifiers. The high-current power
supplies also have more reservoir capacitance than before (anywhere from 10-50% more,
depending upon the model). Finally, the power supply circuit board has been redesigned for better
isolation between the incoming AC power and the DC power supplies.
, LOWER ENERGY
LESS HEA
A new green standby mode reduces standby power draw dramatically. Standby power draw for all
Evolution e Series amplifiers has been reduced to 2W. As an example, the Evolution 402e power
draw drops to 2W from 260W as compared to the Evolution 402 - a reduction of 99% in energy
draw and a huge drop in heat output. The power indicator ring now glows green to indicate the new
energy efficient mode.
e hope that you enjoy your new Evolution e Series amplifier
W
T
CONSUMPTION
.
Sincerely,
Krell Industries, LLC
5
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. There are seven
amplifier models in the Evolution e Series: the 302e Stereo Power Amplifier, the 402e
Stereo Power Amplifier, the 2250e Stereo Power Amplifier, the 403e Three-channel Power
Amplifier, the 3250e Three-channel power Amplifier, the 400e Monaural Power Supply, the
600e Monaural Power Amplifier, and the 900e Monaural Power Amplifier.
Features
Evolution e Series 302e, 402e, 403e, 400e, 600e, and 900e amplifiers are designed with a
signal path that incorporates Krell Current Mode and CAST circuitry.
All amplifiers feature massive power supplies. The power supply makes use of extensive
electrical and magnetic shielding to keep radiated interference out of critical amplifier
circuits.
The Evolution 302e and Evolution 400e are equiped with a 3000 VApower supply. The
Evolution 2250e and Evolution 3250e are equipped with a 2500 VApower supply. The
Evolution 402e and Evolution 600e are equipped with a 4400 VA power supply, and the
Evolution 403e and Evolution 900e house 6000 VA power supplies.
Internal high-current line conditioning circuitry filters RF noise on the AC mains, as well as
compensating for asymmetrical power waveforms and DC on the mains.
Advanced microprocessor control monitors critical operational parameters. In the event of a
problem, the power staus indicator will flash, indicating a potential fault.
6
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.
The Voltage Signal Transmission
and the Traditional Audio System
Traditionally, signal is transmitted in the voltage domain between two components. In an
audio system, each component is a discrete entity with unique characteristics that act
upon the musical signal independently. Each component is unaware of the other
components in the system. The cables that connect the components also have their
own electrical characteristics, which affect the sonic presentation of the entire system.
CAST transmission unifies individual components and interconnects into an electricallylinked whole. The original signal remains unaltered from source to speaker.
CAST Basics
Here is how a CAST audio system works. Internally, each CAST source transfers, or
amplifies, current using Krell Current Mode circuitry. This current signal is then output
using CAST circuitry. When the signal is received by a CAST input, Krell Current Mode
circuitry again takes over until the signal reaches the loudspeaker. By maintaining the
musical signal in the current domain from beginning to end, an entire CAST
behaves as if it is one component. With CAST, circuit board properties and signal
transmission aberrations between components are eliminated. Cable impedances and
their effects on the transmitted signal are non-existent.
system
How CAST and Krell Current Mode Interact
While CAST
its origin stems from Krell Current Mode, the technology developed to transfer the
musical signal within a component. CAST combined with Krell Current Mode circuitry
takes signal transmission to the next evolutionary level. In essence,
is a new method of transferring the musical signal between components,
7
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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
Current Mode technology enjoys bandwidth increases up to an order of magnitude greater
than their voltage based counterparts. This dramatic increase in circuit bandwidth delivers
near perfection in the audible band that typically suffers from phase distortions in voltage
circuits.
CAST Cable Construction
A CAST system uses cables manufactured by Krell and other manufacturers specially
licensed by Krell. Thin and flexible CAST cables are constructed with the same build quality
as other Krell components and are aesthetically matched to the components that Krell
manufactures. An all-metal body and locking connectors with gold contacts are part of the
standard no-compromise specification developed for every CAST cable made.
Evolution CAST
By employing revolutionary current mirror circuitry, the Evolution e Series amplifier
components raises CAST technology to another level. This advanced use of the
technology increases the linearity, transient speed, and bandwidth of the Evolution
components while reducing the distortion by an order of magnitude.
single global circuit.
Krell
The Best Musical Performance
When you operate a CAST
performance area: speed, precision, dynamic range, depth and width of the sound stage,
transient impact, tonal balance, harmonic distortion, and more. The goal for CAST is the
same company goal used for all Krell products. Krell strives for the delivery of the best
performance of a musical event for you, using the full expression of technology to date.
system, you will hear significant improvements in every
8
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. Balanced connections
are completely immune to induced noise from the system or the environment.
CAST and Evolution CAST
Krell Current Audio Signal Transmission, or CAST, is a proprietary Krell circuit technology
for connecting analog components, transmitting the audio waveform between components
in the current domain rather than in the voltage domain. The speed and bandwidth provided
by Krell CAST and its circuitry update, Evolution CAST, yield accurate, realistic music
reproduction, enabling connected components to perform as if they are all part of a single
circuit. CAST and Evolution CAST are balanced connections, and reject induced noise.
Single-ended
A two-wire input or output circuit. Single-ended connections are not recommended for
connections requiring long cable runs. Use care when using single-ended connections,
because the ground connection is made last and broken first. Turn the system off/on prior
to making or breaking single-ended connections.
Operation
Off
When the power status indicator is not illuminated, the amplifier is off.
Stand-by
low-power-consumption status that keeps the audio and power supply circuits at idle.
A
power status indicator illuminates in green. Green is the default standby color and indicates
an ultra low power draw of 2 watts. An optional red standby mode is available which keeps
the input and driver stages continuously powered. Krell recommends leaving the amplifier in
stand-by mode when it is not playing music.
Operation
When the power button is pressed, and the power status indicator is illuminated in blue, the
amplifier is in operational mode and ready to play music.
9
The
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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. This unique technology provides the
component with exceptional speed, and a wide bandwidth.
10
SECTIONTWO
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.
Open the shipping carton and remove the top layer of foam. The carton contains
these items:
1 Evolution e Series amplifier chassis
1 20 amp AC power cord
1 12 VDC (12 V trigger) cable
1 Packet containing the Quick Setup Guide and the warranty registration card
2.
Orient the shipping box so that one person stands at the front of the amplifier and one
person stands at the back of the amplifier. Both people need to grab a pair of the
cardboard handle cutouts (one pair located at the front of the amplifier and one pair
located at the back of the amplifier) and simultaneously lift the amplifier straight up, out
of the carton. Bend and lift with your knees, not your back.
3.
Place the amplifier in a safe location, and remove the protective plastic wrapping.
Note
Save all packing materials. If you need to ship the Evolution e Series amplifier in future, repack
the unit in its original packaging to prevent shipping damage.
11
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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. The ventilation slots on the top of all Evolution e Series amplifiers and the
ventilation slots on the back of the Evolution 302e and 400e amplifiers must be
unobstructed at all time during operation. Do not place flammable material on top or
beneath the component.
If you place the amplifier in a closed cabinet, you may need to modify shelf spacing or use
small fans to increase ventilation. When the front and back of a cabinet are open, the air
space between the chassis and shelf must be unobstructed.
Place the amplifier(s) as close to the loudspeakers as possible. While Evolution CAST and
balanced technology permits long interconnect cable lengths, keep loudspeaker cable
lengths to a minimum.
AC Power Guidelines
The Evolution e Series amplifier requires a dedicated AC circuit rated at a minimum of 20
amps. Do not use extension cords, multiple AC adapters, or AC power strips.
Note
Do not operate the Evolution e Series amplifiers with any device designed to alter or condition
AC power.
12
SECTION THREE
EVOLUTIONEVOLUTION
402e402e
1
2
Anatomy of an Evolution e Series Amplifier
This section describes Evolution e Series amplifier functions.
Figure 1
Evolution e Series Amplifier Front Panel (
Evolution 402e shown
)
Power
1 Power Button
Power Status Indicator
2
1313
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(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
Front Panel Description
See Figure 1 on the previous page
Evolution e Series amplifier front panel functions are described below:
Power
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. The indicator illuminates in blue when the amplifier is in operational
mode. If there is no illumination, please check the following items:
—The power cord is connected to the amplifier
—The power cord is plugged into a live AC power supply
—The back panel power breaker switch (10) is set to the on position
—The back panel backlight switch (8) is set to the on/ext position
—There is no 12 VDC controller connected to the
EXT IN connector
1414
continued
KRELL INDUSTRIES, LLC
45 CONNAIR ROAD
ORANGE, CT 06447-3650
USA
e
3400 W max
SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
(
Figure 2
Evolution 302e Stereo Amplifier Back Panel
Outputs
Inputs
Remote
Power
3 Loudspeaker Binding Posts
4 Single-ended Inputs
5 CAST Inputs
6 Balanced Inputs
7 12 VDC Out/In (12 V Trigger)
Backlight Control
8
9 IEC Power Cord Receptacle
10
Power Breaker Switch
15
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e
KRELL INDUSTRIES, LLC
45 CONNAIR ROAD
ORANGE, CT 06447-3650
USA
3800 W max
4
4
556
3
7
8
10
9
SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
(
Figure 3
Evolution 402e Stereo Amplifier Back Panel
Outputs
Inputs
3 Loudspeaker Binding Posts
4 CAST Inputs
5 Single-ended Inputs
6 Balanced Inputs
Remote
Power
7 12 VDC Out/In (12 V Trigger)
Backlight Control
8
9 IEC Power Cord Receptacle
10 Power Breaker Switch
16
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(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
e
KRELL INDUSTRIES, LLC
45 CONNAIR ROAD
ORANGE, CT 06447-3650
USA
5
000 W max
Figure 4
Evolution 403e Multi-channel Amplifier Back Panel
Outputs
Inputs
Remote
Power
3 Loudspeaker Binding Posts
4 CAST Inputs
5 Single-ended Inputs
6 Balanced Inputs
12 VDC Out/In (12 V Trigger)
7
Backlight Control
8
IEC Power Cord Receptacle
9
10 Power Breaker Switch
1717
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(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
e
LLC
2500 W max
Figure 5
Evolution 400e Monaural Amplifier Back Panel
Outputs
Inputs
Remote
Power
3 Loudspeaker Binding Posts
4 CAST Input
5 Single-ended Input
6 Balanced Input
12 VDC Out/In (12 V T
7
Backlight Control
8
rigger)
9 IEC Power Cord Receptacle
10 Power Breaker Switch
d
18
continue
K
RELL INDUSTRIES, LLC
4
5 CON NAIR ROAD
ORANGE, CT 06447-3650
USA
e
3
800 W max
456
3
7
8
10
9
(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
Figure 5
Evolution e Series Monaural Amplifier Back Panel (
Evolution 600e shown
)
Outputs
Inputs
3 Loudspeaker Binding Posts
4 CAST Input
5 Single-ended Input
6 Balanced Input
Remote
7 12 VDC Out/In (12 V Trigger)
8 Backlight Control
Power
9 IEC Power Cord Receptacle
10 Power Breaker Switch
1919
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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)
IEC Power Cord Receptacle
7
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)
IEC Power Cord Receptacle
7
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.
Inputs
4 CAST Inputs (one per channel)
These are CAST inputs with 4-pin bayonet connectors, for use with Krell CASTequipped preamplifiers and components.
5 Single-ended Inputs (one per channel)
These are single-ended analog inputs with RCA connectors.
6 Balanced Inputs (one per channel)
These are balanced analog inputs with XLR connectors.
Remote Connections
7 12 VDC In/Out (12 V Trigger)
In.
The 12 V trigger allows you to turn the Evolution e Series amplifier on or to stand-
by from other components.
Out. The output sends 12 VDC (12 V trigger) power on/off signals to other Krell
components and other devices that incorporate a 12 V trigger
or parts of
in the following configuration: Tip = +12 V, Sleeve = GND.
Notes
When an Evolution e Series amplifier is in the operational mode, the 12 V trigger provides 12 Volts
of DC output. When the amplifier is in the stand-by mode or off, the DC output is 0
maximum of 30 mA is available from the 12 V trigger output.
Consult the owner's reference of the components used in a custom installation to take full
advantage of the remote capabilities of an Evolution e Series amplifier
systems to be easily controlled remotely
, allowing whole systems
. Mono 3.5 mm connectors are used
A
olts.
V
.
d
22
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(SECTION THREE: Anatomy of an Evolution e Series Amplifier continued)
8 Backlight Control
Power
10 Power Breaker Switch
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.)
Off. This turns off the power status indicator, during normal operation. The power status
indicator remains illuminated for ten seconds after the power buton is pressed.
9 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.
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.
23
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(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.
Inputs
4 Single-ended Inputs (one per channel)
These are single-ended analog inputs with RCA connectors.
5 Balanced Inputs (one per channel)
These are balanced analog inputs with XLR connectors.
9 Input Switch
Set this switch for the style of connection being used, balanced/XLR or Singleended/RCA.
Remote Connections
6 12 VDC In/Out (12 V Trigger)
In,
The 12 V trigger allows you to turn the Evolution e Series amplifier on or to stand-
by from other components.
Out. The output sends 12 VDC (12 V trigger) power on/off signals to other Krell
components and other devices that incorporate a 12 V trigger, allowing whole systems
or parts of systems to be easily controlled remotely. Mono 3.5 mm connectors are used
in the following configuration: Tip = +12 V, Sleeve = GND.
Notes
When an Evolution e Series amplifier is in the operational mode, the 12 V trigger provides 12 Volts
of DC output. When the amplifier is in the stand-by mode or off, the DC output is 0 Volts. A
maximum of 30 mA is available from the 12 V trigger output.
Consult the owner's reference of the components used in a custom installation to take full
advantage of the remote capabilities of an Evolution e Series amplifier.
24
(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.
10 Speaker Fuses
The speaker fuse protects the 2250e and 3250e in case of overload or
malfuction.
25
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 RCAconnector, and a pair of
loudspeaker binding posts. The rear panel also has 12 VDC trigger input and outputs, and
a backlight remote trigger input. The Evolution e Series 2250e, and 3250e amplifier
channel has a balanced input via an XLR connector, a single-ended RCAconnector, and a
pair of loudspeaker binding posts. The rear panel also has 12 VDC trigger input and
output. All inputs and outputs are located on the Evolution e Series amplifier back panel.
Maintain the correct left/right orientation, when hooking up your system.
CAST Connections
Krell recommends using its proprietary Krell CAST system for unparalleled sonic
performance for connections between the Evolution e Series amplifier and other CASTequipped components. Krell CAST uses flexible interconnecting cables that can be drawn
through tight spaces and concealed.
Balanced Connections
The Evolution e Series amplifier also offers balanced operation. The circuitry and
connections associated with balanced operation not only can minimize sonic loss but also
are immune to induced noise, especially for installations using long cables.
XLR Pin Configuration
Pin 1 Ground
Pin 2 Non-inverting (0
Pin 3 Inverting (180
O
) (hot)
O
) (cold)
Single-ended Connections
Each Evolution e Series amplifier channel has one single-ended input. If connecting a vacuum
tube preamplifier, use the single-ended inputs only (see below). Connect the u-shaped jumpers
between pins 1 and 3 of the XLR connectors when using single-ended inputs. On the 2250e
and 3250e use the Input Select Switch to select single-ended. No jumpers are necessary
.
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(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. Therefore, if connecting a tube
preamplifier, use the single-ended inputs only. For more information about DC protection
circuitry features,
see Error Codes on page 31.
Connection Steps
See Figure 8 on Page 28
Position the amplifier where you intend to use it in your system.
The following steps describe how to connect an Evolution e Series amplifier to
your system:
1.
Turn off all power sources and components before connecting inputs and outputs.
2.
Neatly arrange and organize wiring to and from the Evolution e Series amplifier and all
components. Separate AC wires from audio cables to prevent hum or other unwanted
noise from being introduced into the system.
3.
Connect the outputs of your preamplifier to the appropriate CAST (4), balanced (6), or
single-ended inputs (5) on the Evolution e Series amplifier.
ote
N
Connect the u-shaped jumpers between pins 1 and 3 of the XLR connectors when using singleended inputs. On 2250e and 3250e toggle the Input Select Switch to single-ended.
4.
Connect the loudspeaker cables to the loudspeaker binding posts (7) on the Evolution e
Series amplifier. The binding posts accept spade lugs only. Take care to observe the
correct polarity when making connections:
positive input of the loudspeaker. The negative (-) output connects to the negative input
of the loudspeaker.
5.
Connect the supplied
6.
Plug the
Note
Use only the power cord provided with the Evolution e Series amplifier to make the connection to
AC power. Operation with a power cord other than the one supplied by Krell could induce noise,
limit current, or otherwise impair the ability of the amplifier to perform optimally.
AC power cord into AC power.
AC power cord to the
The positive (+) output connects to the
AC power cord receptacle (9).
27
(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.
Krell amplifiers have large reserves of clean power that can safely drive loudspeakers to higher
sound pressure levels than other amplifiers. Use care when setting high playback levels, and
lower the volume level at the first sign of loudspeaker distress.
On/Off and Stand-by Operation
1.
Move the back panel power breaker switch (10) to the up position to place the amplifier
in stand-by mode. The power status indicator (2) illuminates in green. Green is the
default standby color and indicates an ultra low power draw of 2 watts. On the
Evolution 302e, 402e, 403e, 400e, 600e, and 900e amplifiers an optional red standby
mode is available which keeps the input and driver stages continuously powered. To
engage the red standby power mode, move the power breaker switch (10) to the down
position, and while pressing the power button (1) on the amplifier front panel, return
power breaker switch (10) to the up position. Repeat the procedure to return to the
green operating mode.
2.
Press the power button (1) on the amplifier front panel.
illuminates in blue.
The initial power-up phase lasts approximately 30 seconds from the moment the back
panel power breaker switch is placed in the up position. If the power button is pressed
during this period, the power status indicator flashes blue for the remainder of the initial
power-up phase. When the initial power-up phase is complete, the power indicator
illuminates in blue and is no longer flashing.
3.
With the preamplifier muted or its volume completely lowered, select a source.
4.
Increase the volume control to the desired listening level.
o return the amplifier to stand-by
5.
T
power status indicator turns green or red, and the amplifier is in the stand-by mode.
It is now safe to place the rest of the system in stand-by.
, press the power button on the front panel.
The amplifier is in the operational mode.
The power status indicator (2)
The
Powering Off
Krell recommends leaving Evolution e Series amplifiers in the stand-by mode between
listening sessions. Turn the amplifier off using the power breaker switch (10), and
disconnect the amplifier from
AC power when the system is not being used for an extended
29
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.
Note
During these steps, the back panel power breaker switch remains in the on position.
1.
Check that all input and output connections are of sound construction.
2.
With the amplifier in stand-by mode, remove the interconnect cables, then turn the
amplifier on. If the hum disappears, turn the amplifier into stand-by mode again, and
reinsert one of the interconnect cables. Turn the amplifier back on. Repeat this process
for each cable.
3.
If the hum reappears with one or both interconnect cables reinserted, the cable needs
to be checked.
4.
If the interconnect cables are sound, you may be experiencing a ground loop. Please
contact your authorized Krell dealer, distributor, or Krell for suggestions on how to
eliminate the ground loop.
30
continued
(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.
Diagnostic Code Possible Condition Course of Action
1 flash Internal power supply rail fault Breaker Switch will
2 flashes Excessive DC at Output Breaker Switch will
3 flashes Excessive Output Current Check loudspeaker and
automatically shut off.
Contact your Dealer /
Distributor or the Krell
Factory
automatically shut off.
Contact your Dealer /
Distributor or the Krell
Factory
cables for short circuits. If
you are driving more than
one loudspeaker per
channel, check that
thecombined load does not
drop below 2 Ohms. The
power breaker switch must
be shut off to reset the fault
condition.
.
.
4 flashes Excessive temperature Allow the amplifier to cool,
and increase ventilation. If
the problem persists,
please contact your Dealer
/ Distributor.
5 flashes Excessive DC at input Check the preamplifier
output and source outputs
for excessive DC voltage.
If you are using a vacuum
tube preamplifier
the single-ended inputs, as
they are capacitor coupled.
6 flashes Line frequency error Contact your Dealer /
Distributor or the Krell
Factory
31
.
, use only
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. When a new component is introduced, a low frequency hum may occur in one or both
loudspeakers. Check all input and output connections and cables, making sure they are
of sound construction. See
interconnects and cables are sound, you may be experiencing a ground loop.
often be easily eliminated. Please contact your authorized Krell dealer, distributor, or
Krell for suggestions on how to solve this problem.
Q. My loudspeakers are rated for 150 Watts. Are the Evolution models too powerful for
them?
Troubleshooting System Noise,
on page 24. If the
This can
A. No. A loudspeaker seldom is damaged from overdriving. More often, damage occurs
when an amplifier that lacks sufficient power is asked to handle heavy demand
situations such as high playback levels. These amplifiers may have very high 8 Ohm
power ratings, but in heavy demand situations they can be driven into clipping (in which
high power, high frequency harmonics go to the loudspeakers, due to loss of amplifier
power). Clipping can damage loudspeakers. Avoid damage to your loudspeakers by
reviewing your loudspeaker’s specifications, and exercise caution in heavy demand
situations.
32
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. CD and
DVD players carry a limited warranty of five years from date of purchase or six years from date
of manufacture for parts and labor on circuitry, and three years for parts and labor on
mechanical parts. Should the product fail to perform at any time during the warranty, 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. This warranty shall be in lieu of any other
warranty
merchantability or fitness for a particular purpose. There are no warranties which exceed
beyond those described in this document, if the product does not perform as warranted herein,
the owner's sole remedy shall be repair
consequential damages arising from purchase, use, or inability to use the product, even if Krell
has been advised of the possibility of such damages.
IMPORTANT
The single-ended inputs on the Evolution e Series amplifiers are capacitor-coupled. Use
these inputs whenever you are connecting a tube preamplifier.
Proof of purchase in the form of a bill of sale or receipted invoice substantiating that the
product is within the warranty period must be presented to obtain warranty service.
warranty begins on the date of the original retail purchase, as noted on the bill of sale or
receipted invoice from an authorized Krell dealer or distributor. Previously owned equipment,
when re-purchased from an authorized Krell dealer or distributor, has the balance of the
original warranty, based on the original date of manufacture. Krell dealers and distributors
are not authorized to sell current products on the Internet. Current products purchased via
the Internet do not have any transferrable warranty.
, expressed or implied, including, but not limited to, any implied warranty of
. In no event will Krell be liable for incidental or
The
The warranty for a Krell product is valid only in the country to which it was originally shipped,
There may be
through the authorized Krell distributor for that country
, and at the factory
.
restrictions on or changes to the Krell warranty because of regulations within a specific
country. Please check with your distributor for a complete understanding of the warranty in
your country
.
33
continue
d
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.-based freight forwarder of your
choice. Freight and other charges to ship the product 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 a product damaged in transit to the factory. You are responsible for filing
claims for shipping damages during the return shipment.
Krell does not supply replacement parts and/or products to the owner of the product.
Replacement parts and/or products will be furnished only to the distributor performing
service on this product on an exchange basis only; any parts and/or products returned to
Krell for exchange become the property of Krell.
No expressed or implied warranty is made for any Krell product damaged by accident,
abuse, misuse, natural or personal disaster, or unauthorized modification.
Any unauthorized voltage conversion, disassembly, component replacement,
perforation of chassis, updates, or modifications performed to the product will void
the warranty.
The operating voltage of the product is determined by the factory and can only be changed
by an authorized Krell distributor or at the factory. The voltage for this product in the U.S.A.
cannot be changed until six months from the original purchase date.
In the event that Krell receives a product for warranty service that has been modified in any
way without Krell authorization, all warranties on that product will be void.
s expense before it is
be returned to original factory layout specifications at the owner
’
The product will
repaired. All repairs required after the product has been returned to original factory
specifications will be charged to the customer, at current parts and labor rates.
All operational features, functions, and specifications and policies are subject to change
without notification.
o register your product for warranty benefits, please complete and return the
T
Warranty Registration Card enclosed in the shipping box within 15 days of
purchase. Thank you.
34
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
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.com
To contact the Krell Service Department:
TELL 203-298-4020, Monday-Friday
9:00 AM to 5:00 PM EST
FAX 203-795-2287
E-MAIL service@krellonline.com
WEBSITE http://www.krellonline.com
How to Return a Product
To return a product to Krell, please follow this procedure so that we may serve
you better:
before
you return the component
1.
Obtain a Return Authorization Number (R/A number) and shipping address
from the Krell Service Department.
2.
Insure and accept all liability for loss or damage to the product during shipment
to the Krell factory and ensure that all freight (shipping) charges are prepaid.
The product may also be hand delivered if arrangements with the Service Department
have been made in advance. Proof of purchase will be required for warranty validation at
the time of hand delivery.
ANT
IMPOR
Use the original packaging to ensure the safe transit of the product to the factory, dealer, or
distributor
for such packaging if the product received by Krell was boxed in nonstandard packaging or if
the original packaging was so damaged that it was unusable. If Krell determines that new
packaging is required, the owner will be notified before the product is returned.
How to Purchase
T
T
. Krell may, at its discretion, return a product in new packaging and bill the owner
Additional Packing
o purchase additional packing, please contact your authorized Krell dealer, distributor, or
the Krell Service Department for assistance.
35
35
Specifications
easurement
M
FREQUENCY RESPONSE 20 Hz to 20 kHz +0, –0.10 dB
IGNAL-TO-NOISE RATIO
S
Wideband, unweighted, referred to full
ower output
p
“A” weighted
volution 302e Amplifier
E
<0.5 Hz to 180 kHz +0, –3 dB
>107 dB
>117 dB
volution 402e Amplifier
E
20 Hz to 20 kHz +0, –0.18 dB
<0.5 Hz to 120 kHz +0, –3 dB
>106 dB
>116 dB
GAIN 25.5 dB 25.4 dB
TOTAL HARMONIC DISTORTION <0.02% at 1 kHz, at 300 W, 8 Ohms
<0.15% at 20 kHz, at 300 W, 8 Ohms
<0.02% at 1 kHz, at 400 W, 8 Ohms
<0.15% at 20 kHz, at 400 W, 8 Ohms
INPUT IMPEDANCE
Single-ended
Balanced
CAST
100 kOhms
200 kOhms
75 Ohms
100 kOhms
200 kOhms
70 Ohms
INPUT SENSITIVITY
Single-ended or balanced
CAST
OUTPUT POWER
All channels driven
OUTPUT VOLTAGE 139 V peak-to-peak
2.60 V rms
2.60 mA rms
300 W rms at 8 Ohms
600 W rms at 4 Ohms
1200 W rms at 2 Ohms
49 V rms
3.04 V rms
3.04 mA rms
400 W rms at 8 Ohms
800 W rms at 4 Ohms
1600 W rms at 2 Ohms
160 V peak-to-peak
57 V rms
OUTPUT CURRENT 35 A peak 37 A peak
SLEW RATE 120 V/µs 100 V/µs
OUTPUT IMPEDANCE <0.040 Ohms at 20 Hz
<0.053 Ohms, 20 Hz to 20 kHz
DAMPING FACTOR
Referred to 8 Ohms
>200 at 20 Hz
>150, 20 Hz to 20 kHz
<0.055 Ohms at 20 Hz
<0.064 Ohms, 20 Hz to 20 kHz
>145 at 20 Hz
>125, 20 Hz to 20 kHz
POWER CONSUMPTION
Stand-by
High Current Stand-by
Idle
Maximum
2 W
150 W
320 W
3400 W
2 W
260 W
390 W
3800 W
HEAT OUTPUT
Stand-by
High Current Stand-by
Idle
Maximum
INPUTS 2 single-ended via RCA connector
7 BTU/hr.
510 BTU/hr.
100 BTU/hr
1
.
5500 BTU/hr.
2 balanced via XLR connector
2 CAST
via 4-pin bayonet connector
7 BTU/hr.
890 BTU/hr.
1300 BTU/hr
.
6400 BTU/hr.
2 single-ended via RCA connector
2 balanced via XLR connector
2 CAST
via 4-pin bayonet connector
OUTPUTS 2 pairs Krell binding posts 2 pairs Krell binding posts
DIMENSIONS 17.3 in. W x 9.8 in. H x 20.7 in. D
438 mm W x 248 mm H x 525 mm D
17.3 in. W x 9.8 in. H x 22.1 in. D
438 mm W x 248 mm H x 550 mm D
WEIGHT
Shipping
Unit only
138 lb., 62.4 kg
120 lb., 54.3 kg
150 lb., 67.9 kg
135 lb., 61.1 kg
All operational features, functions, specifications, and policies are subject to change without notification.
36
continued
Specifications continued)
(
Measurement Evolution 403e Amplifier Evolution 400e Monaural Amplifier
FREQUENCY RESPONSE 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 125 kHz +0, –3 dB
SIGNAL-TO-NOISE RATIO
Wideband, unweighted, referred to full
power output
“A” weighted
>106 dB
>116 dB
>108 dB
>118 dB
GAIN 25.4 dB 25.4 dB
TOTAL HARMONIC DISTORTION <0.02% at 1 kHz, at 400 W, 8 Ohms
<0.15% at 20 kHz, at 400 W, 8 Ohms
<0.02% at 1 kHz, at 400 W, 8 Ohms
<0.15% at 20 kHz, at 400 W, 8 Ohms
INPUT IMPEDANCE
Single-ended
Balanced
CAST
100 kOhms
200 kOhms
70 Ohms
100 kOhms
200 kOhms
70 Ohms
INPUT SENSITIVITY
Single-ended or balanced
CAST
OUTPUT POWER 400 W rms at 8 Ohms
OUTPUT VOLTAGE 160 V peak-to-peak
3.04 V rms
3.04 mA rms
800 W rms at 4 Ohms
1600 W rms at 2 Ohms
57 V rms
3.04 V rms
3.04 mA rms
400 W rms at 8 Ohms
800 W rms at 4 Ohms
1600 W rms at 2 Ohms
160 V peak-to-peak
57 V rms
OUTPUT CURRENT 37 Apeak 37 Apeak
SLEW RATE 100 V/µs 100 V/µs
OUTPUT IMPEDANCE <0.055 Ohms at 20 Hz
<0.064 Ohms, 20 Hz to 20 kHz
<0.055 Ohms at 20 Hz
<0.064 Ohms, 20 Hz to 20 kHz
DAMPING FACTOR
Referred to 8 Ohms
>145 at 20 Hz
>125, 20 Hz to 20 kHz
>145 at 20 Hz
>125, 20 Hz to 20 kHz
POWER CONSUMPTION
Stand-by
High Current Stand-by
Idle
Maximum
T OUTPUT
HEA
Stand-by
High Current Stand-by
Idle
Maximum
INPUTS 3 single-ended via RCA connector
2 W
370 W
570 W
5000 W
7 BTU/hr
1270 BTU/hr.
1950 BTU/hr.
7700 BTU/hr
.
3 balanced via XLR connector
3 CAST via 4-pin bayonet connector
2 W
150 W
210 W
2500 W
7 BTU/hr.
510 BTU/hr.
720 BTU/hr.
3800 BTU/hr
.
1 single-ended via RCA connector
1 balanced via XLR connector
1 CAST via 4-pin bayonet connector
OUTPUTS 3 pairs Krell binding posts 3 pairs Krell binding posts
DIMENSIONS 17.3 in. W x 9.8 in. H x 26.1 in. D
438 mm W x 248 mm H x 662 mm D
14.5 in. W x 9.8 in. H x 20.65 in. D
368 mm W x 248 mm H x 525 mm D
WEIGHT
Shipping
Unit only
190 lb., 86 kg
175 lb., 79.2 kg
120 lb., 54.3 kg
102 lb., 46.2 kg
All operational features, functions, specifications, and policies are subject to change without notification.
37
continue
d
Specifications continued)
(
Measurement Evolution 600e Monaural Amplifier Evolution 900e Monaural Amplifier
FREQUENCY RESPONSE 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
SIGNAL-TO-NOISE RATIO
Wideband, unweighted, referred to full
power output
“A” weighted
110 dB
>
119 dB
>
113 dB
>
122 dB
>
GAIN 25.4 dB 25.4 dB
TOTAL HARMONIC DISTORTION <0.02% at 1 kHz, at 600 W, 8 Ohms
<0.15% at 20 kHz, at 600 W, 8 Ohms
<0.02% at 1 kHz, at 900 W, 8 Ohms
<0.15% at 20 kHz, at 900 W, 8 Ohms
INPUT IMPEDANCE
Single-ended
Balanced
CAST
100 kOhms
200 kOhms
70 Ohms
100 kOhms
200 kOhms
70 Ohms
INPUT SENSITIVITY
Single-ended or balanced
CAST
OUTPUT POWER 600 W rms at 8 Ohms
OUTPUT VOLTAGE 196 V peak-to-peak
3.72 V rms
3.72 mA rms
1200 W rms at 4 Ohms
2400 W rms at 2 Ohms
69 V rms
4.55 V rms
4.55 mA rms
900 W rms at 8 Ohms
1800 W rms at 4 Ohms
3600 W rms at 2 Ohms
240 V peak-to-peak
85 V rms
OUTPUT CURRENT 49 Apeak 60 Apeak
SLEW RATE 100 V/µs 90 V/µs
OUTPUT IMPEDANCE <0.030 Ohms, 20 Hz to 20 kHz <0.023 Ohms, 20 Hz to 20 kHz
DAMPING FACTOR
Referred to 8 Ohms
>270, 20 Hz to 20 kHz >350, 20 Hz to 20 kHz
POWER CONSUMPTION
Stand-by
High Current Stand-by
Idle
Maximum
2 W
260 W
410 W
3800 W
2 W
440 W
650 W
5000 W
HEAT OUTPUT
Stand-by
High Current Stand-by
Idle
Maximum
INPUTS 1 single-ended via RCA
7 BTU/hr.
890 BTU/hr.
1400 BTU/hr.
5500 BTU/hr.
connector
1 balanced via XLR connector
1 CAST via 4-pin bayonet connector
7 BTU/hr.
1500 BTU/hr.
2200 BTU/hr.
7700 BTU/hr.
1 single-ended via RCA
connector
1 balanced via XLR connector
1 CAST via 4-pin bayonet connector
OUTPUTS 1 pair Krell binding posts 1 pair Krell binding posts
DIMENSIONS 17.3 in. W x 9.8 in. H x 22.1 in. D
438 mm W x 248 mm H x 560 mm D
17.3 in. W x 9.8 in. H x 26.1 in. D
438 mm W x 248 mm H x 662 mm D
WEIGHT
Shipping
Unit only
150 lb., 67.9 kg
135 lb., 61.1 kg
190 lb., 86 kg
175 lb., 79.2 kg
All operational features, functions, specifications, and policies are subject to change without notification.
38
continue
d
Specifications continued)
(
Measurement Evolution 2250e Amplifier Evolution 3250e Amplifier
REQUENCY RESPONSE
F
0 Hz to 20 kHz +0, –0.07 dB
2
<0.3 Hz to 150 kHz +0, –3 dB
0 Hz to 20 kHz +0, –0.07 dB
2
<0.3 Hz to 150 kHz +0, –3 dB
SIGNAL-TO-NOISE RATIO
Wideband, unweighted, referred to full
power output
“A” weighted
108 dB
>
116 dB
>
108 dB
>
116 dB
>
GAIN 25.7 dB 25.7 dB
TOTAL HARMONIC DISTORTION <0.02% at 1 kHz, at 250 W, 8 Ohms
<0.15% at 20 kHz, at 250 W, 8 Ohms
<0.02% at 1 kHz, at 250 W, 8 Ohms
<0.15% at 20 kHz, at 250 W, 8 Ohms
INPUT IMPEDANCE
Single-ended
Balanced
50 kOhms
100 kOhms
50 kOhms
100 kOhms
INPUT SENSITIVITY
Single-ended or balanced
OUTPUT POWER 250 W rms per channel at 8 Ohms
OUTPUT VOL
TAGE
2.32 V rms 2.32 V rms
250 W rms per channel at 8 Ohms
500 W rms per channel at 4 Ohms
500 W rms per channel at 4 Ohms
47 V rms or 133 V peak-to-peak 47 V rms or 133 V peak-to-peak
OUTPUT CURRENT 20 A peak 20 A peak
SLEW RATE 80 V/µs 80 V/µs
OUTPUT IMPEDANCE <0.060 Ohms at 20 Hz
<0.067 Ohms, 20 Hz to 20 kHz
<0.060 Ohms at 20 Hz
<0.067 Ohms, 20 Hz to 20 kHz
DAMPING FACTOR
Referred to 8 Ohms
>130 at 20 Hz, at 8 Ohms
>120, 20 Hz to 20 kHz at 8Ohms
>130 at 20 Hz, at 8 Ohms
>120, 20 Hz to 20 kHz at 8Ohms
POWER CONSUMPTION
Stand-by
High Current Stand-by
Idle
Maximum
2 W
40 W
90 W
2400 W
2 W
50 W
125 W
2400 W
HEAT OUTPUT
Stand-by
High Current Stand-by
Idle
Maximum
7 BTU/hr.
140 BTU/hr.
310 BTU/hr.
3100 BTU/hr.
INPUTS 2 single-ended via RCA connector
2 balanced via XLR connector
OUTPUTS 2 pair WBT
binding posts
DIMENSIONS 17.5 in. W x 7.6 in. H x 19 in. D
438 mm W x 193 mm H x 486 mm D
7 BTU/hr.
170 BTU/hr.
430 BTU/hr.
3100 BTU/hr
.
3 single-ended via RCA connector
3 balanced via XLR connector
3 pair WBT
binding posts
17.5 in. W x 7.6 in. H x 19 in. D
438 mm W x 193 mm H x 486 mm D
WEIGHT
Shipping
Unit only
92 lb., 34.8 kg
77 lb., 41.6 kg
95 lb., 43 kg
80 lb., 36.2 kg
All operational features, functions, specifications, and policies are subject to change without notification.
39
EVOLUTION e SERIES AMPLIFIERS
3
02e AND 402e STEREO
403e
600e AND 900e MONAURAL
WNER’S REFERENCE
O
THREE-CHANNEL
V 1.0
KRELL
ORANGE, CT
TELL: 203-298-4000 • FAX: 203-891-2028
E-MAIL: sales@krellonline.com
http://www.krellonline.com
INDUSTRIES, LLC
45 CONNAIR ROAD
06477-3650 USA
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