Krell Industries 200c Manuel utilisateur

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Full PowerBalanced

PowerAmplifiers

200c, 300c, 600c Stereo

250Mc, 350Mc, 650McMonaural

with Krell CASTTechnology

Instructions for Use

Owner’s Reference

Full PowerBalanced

PowerAmplifiers

200c, 300c, 600c Stereo

250Mc, 350Mc, 650Mc Monaural

with Krell CASTTechnology

v 00.0

KrellIndustries,Inc.

45 ConnairRoad

Orange, CT06477-3650 USA

TEL203-799-9954

FAX203-891-2028

E-MAILkrell @krellonline.com

WEBSITEhttp://www.krellonline.com

Thisproductcomplieswith the EMCdirective (89/336/EEC)andthe low-voltagedirective (73/23/EEC).

WARNINGS

TheFull PowerBalancedamplifiermustbeplacedona firm, level surfacewhereit is not exposedto drip-

pingor splashing.

Theventilationgridsonthetopof theFull PowerBalancedamplifiermustbeunobstructedat all timesduring

operation.Donotplaceflammablematerialontopof or beneaththecomponent.

Beforemakingconnectionsto the Full PowerBalancedamplifier, ensurethat ff is off andthe preamplifier

is in muteor stand-bymode.Makesureall cableterminationsareof the highestquality andfree from

frayedends,shortcircuits, or coldsolderjoints.

Thedifferential circuitry employedwithFull PowerBalancedamplifiersrequiresspecialattentionwhenconnect-

ingspeakers.DOnotconnectthenegativespeakerterminalstogether.Donotconnectthenegativespeakerter-

minalsto groundor attemptto bridgetheleft andright speakerbindingpostsof Full PowerBalancedstereoampli-

fiers.

Donot connecta Full PowerBalancedamplifier to a speakerselector device that employsa common

groundscheme,asit mayshort-circuit theamplifieroutput.

THEREARENOUSERSERVICEABLEPARTSINSIDE ANYKRELLPRODUCT.

PleasecontactyourauthorizedKrell dealer,distributor, or Krell if youhaveanyquestionsnotaddressedin

this referencemanual.

This;~roductis manufacturedin theUnitedStatesofAmerica.Krell~is aregisteredtrademarkof KrellIndustries.Inc.. andis restrictedfor usebyKrellIndus-

tdes.Inc., its subsidiaries,andauthorizedagents.SustainedPlateauBiasII is apatentof Krell Industries,Inc. Krell CAST

is apatentpendingofKrell

Industries,Inc. Krell CurrentMode

TM,Krell Link

TM, andKrell PlaybackSystem

aretrademarksof Krell Industries,Inc. All othertrademarksareregistered

to their respectivecompanies.

Contents

INTRODUCTION

DEFINITION OF TERMS

REVOLUTIONARYKRELL CAST TECHNOLOGY

UNPACKING

PLACEMENT

ACPowerGuidelines

FRONTPANELDESCRIPTION

200c,300c,and600cStereoPowerAmplifiers

250Mc,350Mc,and 650McMonauralPowerAmplifiers

BACKPANELDESCRIPTION

200c,300c,and600cStereoPowerAmplifiers

250Mc,350Mc,and 650McMonauralPowerAmplifiers

CONNECTINGTHE FULL POWERBALANCEDAMPLIFIER

TO YOURSYSTEM

Input andOutputConnections

Krell Link Connections

DCProtectionCircuitry

Usinga TubePreamplifier

AMPLIFIER OPERATION

On/OffandStand-byOperation

Krell LinkOperation

REMOTECONTROLOPERATION

Howto TumOff the Amplifier LEDs

Howto Tumon the Amplifier LEDs

Howto Switch betweenKrell CASTand XLRInputs

Usinga DedicatedWallOutlet andSwitch

AMPLIFIER TROUBLESHOOTING

Howto TroubleshootSystemNoise

Howto EvaluateAmplifier Operation

QUESTIONSAND ANSWERS

WARRANTY

RETURNAUTHORIZATION PROCEDURE

SPECIFICATIONS

Page

,13

Krell FullPowerBalancedPowerAmplifiers iii

Illustrations

FIGURE1 Full PowerBalancedStereo Amplifier Front Panel

FIGURE2 Full PowerBalancedMonauralAmplifier Front Panel

FIGURE3 Full PowerBalancedStereo Amplifier BackPanel

FIGURE4 Full PowerBalancedMonaural Amplifier BackPanel

Page

iv Krell FullPowerBalancedPowerAmplifiers

Introduction Definition of Terms

TheFull PowerBalancedseries of amplifiers

consists of three stereo amplifiers, the Full

PowerBalanced 200c, 300c, and 600c, and

three monauralamplifiers, the Full PowerBal-

anced250Mc,350Mc,and650Mc.Installation,

connection,andoperationof all amplifiers in the

Full PowerBalancedseries are identical; how-

ever, a pair of Full PowerBalancedMonaural

amplifiers are requiredfor stereooperation.

Full PowerBalancedamplifiers canbe config-

ured to accommodateany sophisticated music

or hometheater system and can be operated

by an optional remotecontrol or through the

remotecontrol of other Krell components.

This owner’sreference manualcontains impor-

tant informationonplacement,installation, and

operation of the Full PowerBalancedampli-

fiers. Pleasereadthis informationcarefully. A

thorough understandingof these details will

help ensuresatisfactory operationandlonglife

for your Full PowerBalancedamplifier and

related systemcomponents.

Followingare the definitions of keytermsused

in your owner’sreference manual.

CONFIGURATIONS

Krell Link

A methodof synchronizingremotecontrol oper-

ation for Krell systemsthat includemultiple pre-

amplifiers, amplifiers, andassociated compo-

nents. WhenKrell Link in/out connectionsare

used,the remotecapabilities of the linked com-

ponents are controlled from one component,

called the control component.Thelinked com-

ponents respond to stand-by and operational

modecommandsfrom the control component

via MIDIcables.

INPUT ANDOUTPUTCONNECTIONS

Balanced

A symmetricalinput or output circuit that has

equalimpedancefrom both input terminals to a

commongroundreference point. Theindustry

standardfor professional andsoundrecording

installations, balancedconnectionshave6 dB

moregain than single-ended connections and

allow the useof long interconnectcables. Bal-

ancedconnections are completely immuneto

inducednoise from the systemor the environ-

ment.

Krell Current AudioSignal Transmission

(CAST)

A proprietary Krell circuit technologyfor con-

necting analogcomponents,in whichthe audio

waveformis transmitted betweencomponents

in the current rather than voltage domain.The

speedand bandwidth provided by Krell CAST

yields accurate, realistic musicreproduction.

Krell componentsconnectedvia CASTperform

asif theyareall partof asinglecircuit.

KrellFull PowerBalancedPowerAmplifiers 1

DefinitionofTerms,co,,tinuo,

Single-ended

Atwo-wire input or output circuit. Usecare

whenusing single-endedconnectionsas the

groundconnection is madelast and broken

first. Turnthe systemoff prior to makingor

breaking single-endedconnections. Single-

endedconnections are not recommendedfor

connectionsrequiringlongcableruns.

OPERATION

Off

Whenthe powerswitch on the backpanel is

placedin thedownposition andthe bluepower

LEDsturn off, thecomponentis off.

OperationalMode

Whenthe powerbutton on the front panel is

pressedandthe three blue powerLEDsillumi-

nate, the componentis in the operationalmode

andreadyto play music.

Stand-by Mode

A lowpowerconsumptionstatus that keepsthe

audioandregulatorcircuits at idle. Krell recom-

mendsleaving the componentin the stand-by

modewhenit is not playingmusic.

TECHNOLOGY

Krell CurrentMode

AproprietaryKrell circuit topologyin whichthe

audiogain stagesof a componentoperatein

the current rather than voltagedomain.This

unique technology provides the component

with exceptionalspeedanda widebandwidth.

Krell SustainedPlateauBiasII

AproprietaryKrelldigital circuit thatcontinually

monitorstheinput signal andoutputimpedance

of a Krell amplifierandadjuststhebiasaccord-

ingly to ensureClassAoperation.Sustained

PlateauBias II providesthe enormoussonic

benefitsof continuousClassAoperationwhile

minimizingtheheatgenerationandpowercon-

sumptionnormally associated with Class A

designs.

2 Krell Full PoweredBalancedPowerAmplifiers

Revolutionary Krell CAST

Technology

Current Audio Signal Transmission, termed

CAST,is a revolutionary methodof connecting

analog audio componentsfor unparalleled

sonic performance. Innovative engineering

combinesthe newKrell CASTcircuitry with

existing Krell Current Modetechnologyto cre-

ate entire CASTsystemsthat reproducemusic

with incrediblerange,tonality, andprecision.

Voltage Signal Transmission

andthe Traditional AudioSystem

Traditionally, signalis transmittedin thevoltage

domainbetweentwo components.In an audio

system,eachcomponentis a discrete entity with

uniquecharacteristics that act uponthe musical

signal independently. Each component is

unawareof the other componentsin the system.

Thecables that connect the componentseach

havetheir ownelectrical characteristics, which

affect the sonic presentationof the entire sys-

tem.

CAST: A NewApproach

CASTcircuitry recognizessignal transmitted in

the current domaininstead of the voltage

domainbetweeneach component.CASTtrans-

missionunifies the individual componentsand

their interconnectsinto an electrically linked

whole.Thesonicpresentationof the entire sys-

temremainsintact.

CASTBasics

Here’s howa CASTaudio systemworks. Inter-

nally, eachCASTsourcetransfers, or amplifies,

current usingKrell CurrentModecircuitry. This

current signal is then output using CASTcir-

cuitry. Whenthe signal is received by a CAST

input, Krell CurrentModecircuitry againtakes

over until the signal reachesthe loudspeaker.

Bymaintainingthe musicalsignal in the current

domainfrom beginning to end, an entire CAST

systembehavesas if it is onecomponent.With

CAST,anomaliesof signal transmissionbetween

componentsare eliminated. Cable impedances

andtheir effects onthe transmitted signal are

non-existent.

HowCASTand Krell Current ModeInteract

While CASTis a newmethodof transferring the

musical signal betweencomponents,its origin

stemsfrom Krell Current Mode,the technology

developedto transfer the musicalsignal within

a component. CASTcombinedwith Krell Cur-

rent Modetakes circuitry signal transmissionto

the next evolutionary level. In essence,Krell

CurrentModemaintainsthe integrity of the sig-

nal within the componentand CASTpreserves

the transmitted signal betweencomponents.

Together, CASTand Krell Current Modetech-

nologiesunify separateKrell componentsinto a

singleglobalcircuit.

CASTCable Construction

A CASTsystem uses cables manufactured by

Krell and other manufacturers specially

licensed by Krell. Thin andflexible CASTcables

are constructedwith the samebuild quality as

other Krell products and are aesthetically

matchedto the componentsthat Krell manufac-

tures. Anall-metal bodyandlocking connectors

with gold contactsare part of the standardno-

compromisespecification developedfor evenj

CASTcable made.

The Best Musical Performance

Whenyou operate a CASTsystem, you will

hear significant improvementsin every perfor-

mancearea: speed, precision, dynamicrange,

depth andwidth of the soundstage, transient

impact, tonal balance, harmonicdistortion, and

more. Thegoal for CASTis the samecompany

goalusedfor all Krell products.Krell strives for

the delivery of the best performanceof a musi-

cal eventfor you, using the full expressionof

technologyto date.

KrellFull PowerBalancedPowerAmplifiers 3

Unpacking Placement

Twopeople are needed to removethe Full

PowerBalancedamplifier fromits shippingbox

safelyandeasily.

1. Openthe shipping box andremovethe top

layer of foam.Youseetheseitems:

1 Full PowerBalancedAmplifier

1 Packetcontaining the owner’s

reference manualandthe warranty

registration card

2. Orient the shippingboxso that oneperson

standsat the front of the amplifier andone

personstandsat the rear of the amplifier.

Bothpeopleneedto graba pair of the card-

boardhandlecutouts(onepair locatedat the

front of the amplifier andonepair locatedat

the rear of the amplifier) andsimultaneously

lift theamplifierstraightup,outof thecarton.

3. Place the amplifier in a safe location and

removethe protective plastic wrapping.

Notes

ff any of the items mentionedaboveare not

included in the shipping box, please contact

yourauthorizedKrell dealer,distributor, or Krell

for assistance.

Saveall packingmaterials. If youship yourFull

PowerBalancedamplifier in the future, repack

theunff in its original packagingto preventtran-

sit damage.SeeReturn Authorization Proce-

dure, on page21 for moreinformation.

Before you install the Full PowerBalanced

amplifier into your system, please follow the

guidelines in this section to chooseits proper

location.Thiswill facilitate a clean,trouble-free

installation.

TheFull PowerBalancedamplifier requires at

least two inches (5 cm) of clearance on each

side andat least eight inches(20 cm)of clear-

ance above the componentto provide ade-

quateventilation.

Although Sustained Plateau Bias II circuitry

reducesthe high heat dissipation andheat out-

put of traditional ClassA circuitry, Full Power

Balancedamplifiers still canbecomehot under

normaloperation.

Whenthe front andrear of a cabinet are open

the air spacebetweenthe chassis an~l shelf

mustbeunobstructed.If you place the amplifi-

er in a closed cabinet, you mayneedto modify

shelf spacingor usesmall fans to increaseven-

tilation. For the dimensionsof your Full Power

Balancedamplifier, see Specifications, on

pages 22-23.

Placethe amplifier as close to the speakersas

possible. Krell CASTtechnologypermits you to

useinterconnectcablesof anylength, seeFlev-

olutionary CASTTechnology on page 3;

however,try to keepthe cablelength to a mini-

mum.

All Full PowerBalancedamplifiers drive the

lowest impedances with ease. Whenimped-

ance is added due to long speaker cable

lengths, amplifier poweris wastedin the cable.

Long speaker cables reduce the maximum

powerthat is delivered in the speakers.

4 KrellFull PowerBalancedPowerAmplifiers

Placement,continued

AC POWERGUIDELINES

The Full Power Balanced 200c and 250Mc

amplifiers needto be operatedfrom a dedicat-

ed ACpower line rated at a minimumof 15

amps.The Full PowerBalanced300c, 350Mc,

600c, and650Mcamplifiers needto be operat-

ed from a dedicated ACpowerline rated at a

minimumof 20 amps.

PleasecontactyourauthorizedKrell dealer, dis-

tributor, or Krell before using any devices

designedto alter or stabilize the ACpowerfor

Full PowerBalancedamplifiers.

KrellFullPowerBalancedPowerAmplifiers 5

FIGURE 1 FULL P( IWER BALANCED STEREO AMPLIFIER FR()NT PANEL

123 456

1 Power Stand-by LED

2 Bias LED

3 PowerButton

4 Infrared Sensor

5 Krell CASTLED

6 Regulator LED

6Krell Full PoweredBalancedPowerAmplifiers

Ce manuel convient aux modèles suivants

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