Evolution Amplifiers402 Stereo, 403 Three-channel, 600 and

900 Monaural Power Amplifiers withEvolution CAST Technology

QUICK SETUP GUIDE

Getting Started

THE LEADER IN AUDIO ENGINEERING

The Evolution Series consists of four amplifier models. Evolution amplifiers canbe configured to accommodate any sophisticated music or home theater sys-tem. The amplifiers can be operated by a 12 V trigger, or by using the remotecontrol of other Krell components. A pair of Evolution monaural amplifiers arerequired for stereo operation.

This document outlines the basic steps for unpacking, placing, connecting, andoperating a Evolution Series Power Amplifier.

Please contact your authorized dealer, distributor, or Krell if you have any ques-tions not addressed in the owner’s reference.

The Evolution amplifier must be placed on a firm, level surface where it is not exposed todripping or splashing.

The ventilation grids on the top of the Evolution amplifier must be unobstructed at all timesduring operation. Do not place flammable material on top of or beneath the component.

Before making connections to the Evolution amplifier, ensure that it is off and the pream-plifier is in mute or stand-by mode. Make sure all cable terminations are of the highestquality and free from frayed ends, short circuits, or cold solder joints.

THERE ARE NO USER-SERVICEABLE PARTS INSIDE ANY KRELL PRODUCT.

Two people are needed to remove an Evolution amplifier from its shipping box safe-ly and easily.

1. Open the shipping box and remove the top layer of foam. You see these items:

1 Evolution amplifier1 20 amp AC power cord1 12 VDC (12 V trigger) cable

2. Orient the shipping box so that one person stands at the front of the amplifierand one person stands at the back of the amplifier. Both people need to grab apair of the cardboard handle cutouts (one pair located at the front of the amplifierand one pair located at the back of the amplifier) and simultaneously lift theamplifier straight up, out of the carton.

3. Place the amplifier in a safe location and remove the protective plastic wrapping.

Place the amplifier on a firm, level surface, away from excessive heat, humidity, ormoisture. Each Evolution amplifier requires at least two inches (5 cm) of clearanceon each side and at least eight inches (20 cm) of clearance above the componentto provide adequate ventilation.

If you place the amplifier in a closed cabinet, you may need to modify shelf spacingor use small fans to increase ventilation. When the front and back of a cabinet areopen, the air space between the chassis and shelf must be unobstructed.

Place the amplifier(s) as close to the loudspeakers as possible. While Evolution CASTtechnology permits long cable lengths, keep loudspeaker cable lengths to a minimum.

WARNINGS

Krell Evolution Amplifiers 1

Unpacking

Krell Industries, Inc., 45 Connair Road,Orange, CT 06477-3650 USATEL 203-799-9954, FAX 203-891-2028, E-MAIL krell@krellonline.comWEB SITE www.krellonline.com

Connecting the Amplifier

4 Krell Evolution Amplifiers

Operating the Amplifier

Notes

When powering up any system,always turn amplifiers on last. Whenpowering down, always turn ampli-fiers off first.

To avoid loudspeaker damage, besure to switch all sources with thepreamplifier level either muted orfully attenuated. Do not changeinputs to the amplifier while theamplifier is on.

Krell amplifiers have large reservesof clean power and can safely driveloudspeakers to higher sound pres-sure levels than other amplifiers.However, use care when setting highplayback levels and lower the vol-ume level at any sign of loudspeakerdistress.

Note

Save all packing materials. If youneed to ship the Evolution amplifierin the future, repack the unit in itsoriginal packaging to prevent ship-ping damage.

Placement

AC POWER GUIDELINES

MODEL SERIAL NUMBER

This product complies with the EMC directive (89/336/EEC)and the low-voltage directive (73/23/EEC).

Operate each amplifier from a dedicated AC power line rated at a minimum of 20 amps.

NoteDo not operate the Evolution amplifiers with any device designed to alter or stabilize AC power.

Follow these steps to connect the amplifier to your system:

1. Turn all power sources and components off before connecting inputs and outputs.

2. Neatly organize the wiring between the amplifier and all system components.Separate AC wires from audio cables to prevent hum or other unwanted noisesfrom being introduced into the system.

3. Connect the Evolution CAST cable(s) from your CAST-enabled preamplifier orsource component to the Evolution CAST 4-pin bayonet input(s) (4) on the ampli-fier back panel. For balanced operation, connect the interconnect cable(s) fromyour preamplifier to the balanced XLR input(s) (6) on the amplifier back panel. Forsingle-ended operation, connect the interconnect cable(s) from your preamplifierto the single-ended input(s) (5) on the amplifier back panel.

NotesKrell recommends using proprietary Evolution CAST connections for unparalleled sonicperformance between the Evolution amplifiers and other CAST-equipped components.

Evolution amplifiers also offer balanced operation. The circuitry and connections associatedwith balanced operation not only can minimize sonic loss but also are immune to inducednoise, especially for installations using long cables.

4. Connect the loudspeaker cables to the loudspeaker binding posts (3) on theamplifier back panel. Loudspeaker binding posts for both stereo and monauralamplifiers only accept spade lugs.

5. Plug the AC power cord into the IEC power connector (9) on the back panel.

6. Plug the other end of the AC power cord into the wall socket.

Evolution amplifiers are easy to operate:

1. Move the back panel power breaker switch (10) to the up position to place theamplifier in the stand-by mode. The power status indicator (2) illuminates in red.

2. Press the silver power button (1) on the amplifier front panel. The power statusindicator (2) illuminates in blue. The amplifier is in the operational mode.

NoteThe initial power-up phase lasts approximately 30 seconds from the moment the back panelpower breaker switch is placed in the up position. If the power button is pressed during thisperiod, 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 nolonger flashing.The amplifier is in the operational mode.

3. With the preamplifier muted or volume control completely lowered, select asource.

4. Increase the volume control to the desired listening level.

5. To turn the amplifier off, place it in the stand-by mode by pressing the powerbutton on the front panel. The power status indicator turns red, and the amplifieris in the stand-by mode.

It is now safe to turn off the rest of the system.

NoteFor best performance, leave the amplifier back panel power breaker switch on at all times.

IMPORTANT

Single-ended inputs on the Evolu-tion amplifier are cap-coupled.Use these inputs when connect-ing to a tube preamplifier.

P/N 309224v 06.2

1 packet containing the owner’s refer-ence and the warranty registrationcard

Pin assignments for the XLRconnectors:

Pin 1 Shield (ground)Pin 2 Non-inverting (hot) (0°)Pin 3 Inverting (cold) (180°)

2 Krell Evolution Amplifiers Krell Evolution Amplifiers 3

Figure 1 Evolution Amplifier Front Panel (Evolution 402 shown below)

EVOLUTIONEVOLUTION402402

1 2

44 5 5 6

3

7 8

10 9

Figure 3 Evolution 403 Back Panel

Figure 4 Evolution Monaural Back Panel (Evolution 600 shown)Figure 2 Evolution 402 Back Panel

4 4 455 5 6

3

7 8

10 9

4 5 6

3

7 8

10 9

This product is manufactured in the United States of America. Krell® is a registered trademark of Krell Industries, Inc., and isrestricted for use by Krell Industries, Inc., its subsidiaries, and authorized agents. CAST™ and Evolution CAST™ are trade-marks of Krell Industries, Inc. All other trademarks and trade names are registered to their respective companies.

© 2006 by Krell Industries, Inc., All rights reserved.

Back Panel, continued

6 Left and RightBalanced InputsStereo. One left bal-anced input and oneright balanced input viaXLR connectors.Three-channel. One bal-anced input per channelvia XLR connectors.Monaural. One balancedin-put via an XLR con-nector.

7 12 VDC Out/In(12 V trigger)The 12 V trigger enablesyou to turn the Evolutionamplifier on or off, or toand from stand-by, fromother components.Out. The output sends 12VDC (12 V trigger) poweron/off signals to otherKrell components andother devices that incor-porate a 12 V trigger.

8 BacklightExt In. Connect a 12 Vtrigger to Ext In to turn offthe power status indica-tor using a remote con-trol. On/Ext (see below)must be active in orderfor Ext In to function.On/Ext. Activates thepower status indicator (2).The factory default ison/ext. Off. Turns off the powerstatus indicator.

9 IEC Power ConnectorUsed to connect the pro-vided 20 amp AC powercord.

10 Back Panel Power Breaker SwitchPlace this switch in theup position to put theamplifier in stand-bymode.

Front Panel1 Power Button

Press the power buttonto place the amplifier inoperational mode.Operational mode. Thepower status indicator isilluminated in blue whenthe amplifier is in opera-tional mode.

2 Power Status IndicatorStand-by. The powerstatus indicator is illumi-nated in red when theamplifier is in the stand-by mode.

Back Panel3 Loudspeaker Binding

PostsStereo. One pair of loud-speaker binding postsper channel.Three-channel. One pairof loudspeaker bindingposts per channel.Monaural. One pair ofloudspeaker bindingposts.

4 Evolution CAST InputsThe Evolution CASTinputs allow the Evolutionamplifier to be connectedto other CAST-equippedcomponents.

Stereo. One leftEvolution CAST inputand one right EvolutionCAST input via 4-pinbayonet connectors. Three-channel. OneCAST input per channelvia 4-pin bayonet con-nectors.Monaural. One EvolutionCAST input via a 4-pinbayonet connector.

5 Left and Right Single-ended InputsStereo. One left single-ended input and oneright single-ended viaRCA connectors.Three-channel. One single-ended input perchannel via RCA connec-tors.Monaural. One single-ended input via an RCAconnector.