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KAV-250a

Amplifier CONTENTS

KrelPIndustries,Inc.

45 Connair Road

Orange, CT 06477-3650 USA

TEL 203-799-9954

FAX203-799-9796

E-MAILkrell @krellonline.com

INTRODUCTION

UNPACKING

PLACEMENT

Cabinetry Considerations

ACPowerGuidelines

CONNECTINGTHE KAV-250a

TO YOURSYSTEM

Input and Output Connections

LinkingMultiple Amplifiers

Configuring the KAV-250a

for BridgedOperation

AMPLIFIER OPERATION

On/Off and Stand-byOperation

SystemNoise Considerations

WARRANTY

RETURNAUTHORIZATION

PROCEDURE

SPECIFICATIONS

Page

ILLUSTRATIONS

THE KAV-250a BACKPLATEAND

CONNECTIONSFOR BRIDGED

OPERATION

Page

Industries,Inc. All rightsreserved P/N19608,0230,0000

CEMarking

Thisproductcomplieswith the EMCdirec-

tive (89/336/EEC)andthe low-voltage

directive (73/23/EEC).

Introduction

Thankyoufor yourpurchaseof the Krell

KAV-250a.Toobtain the best performance

fromyourKAV-250aamplifier, paycareful

attentionto its placement,installation, and

operation. A thoroughunderstandingof

thesedetails will helpinsuresatisfactory

operation andlong life for the KAV-250a

andrelated systemcomponents.

THERE ARE NO USER-SERVICEABLE

PARTSINSIDE ANYKRELLPRODUCT.

Pleasecontactyourauthorizeddealer,

distributor, or KrelP, if youhaveany

questionsnot addressedin this refer-

encemanual.

Unpacking

1. Openthe boxandremovethe top layer of

foam.Youwill seetheseitems:

1 KAV-250a

1ACpowercord

1 packetcontainingthe Owner’s

Referenceandthe Warranty

Registration Card.~ ,’~ x ~’ ~x~

NOTE:If anyof theseitemsare n~cld~ed,

pleasecontactyourauthorizedKrefl dealer

ordistributorimmediatelyfor assistance.

2. Carefully removethe unit andacces-

soriesfromthe box.Removethe protec-

tive plasticwrapfromtheunit.

NOTE:Saveall packingmaterials. If you

must ship your ~V-250ain the future,

repackthe unff in its original packagingto

preventtransit damage.

Placement

WARNINGS

Theamplifier mustnot belocatedwhereit

couldbeexposedto dripping or splashing

fluids.

Beforeyouinstall the KAV-250ainto your

system,reviewthe followingguidelinesto

choosethe location for the KAV-250a.This

will facilitateaclean,trouble-freeinstallation.

TheKAV-250adoesnot require anytypeof

specialrackor cabinetfor installation.Forthe

dimensions of the KA V-250a, see

Specificationsonpage12.

Placethe KAV-250aamplifierona firm level

surfaceawayfromdirt or moisture.When

usingcustomracks or cabinetry, keepin

mindtheweightandventilation requirements

for this amplifier.Ideally,theamplifiershould

KRELL

® KAV-250a English Page3 of 12

Placement,continued

beplacedascloseto the speakersaspos-

sible. Runlong balancedinterconnect

cablesto the amplifier andkeepthe speak-

er cable length to a minimum.Speaker

cable adds impedanceto the load the

amplifier mustdrive, regardless of the

cable’sgauge.All Krell amplifierswill drive

the lowestimpedanceswith ease,but when

impedanceis addeddueto long cable

lengths, amplifier poweris wastedin the

cable. Longspeakercables reducethe

maximumpowerthat can be delivered to

the speakers.

CabMetryConsiderations

TheKAV-250aamplifier canbecomequite

warmundernormaloperation. Install the

KAV-250ain a location that providesunob-

structedventilation.If youplacetheamplifi-

erin a closedcabinet,extraventilationsuch

as modified shelf spacingmaybe neces-

sary. In extremeinstances,smallfanshelp

to removingexcessheat from enclosed

spaces.In general,whenthefront andrear

of a cabinetis open,theamplifier hasade-

quateventilation with twoinchesof clear-

anceon each side and eight inches of

clearanceaboveandbelow.

ACPowerGuidelines

For best performance,Krell®recommends

usinga dedicatedACpowerline ratedat a

minimumof fifteen ampswith the KAV-250a

amplifier. For maximumpoweroutput, the

KAV-250ashouldbeoperatedfroma dedi-

cated twenty ampACpower line. The

KAV-250aamplifier shouldonlybeoperated

withthe powercordsupplied.Pleaseconsult

yourdealer,distributor,orKrell®

beforeusing

anydevicesdesignedto alter or stabilizethe

ACpowerfor the KAV-250a.

Connectingthe KAV-250a

to YourSystem

WARNING

Whenmakingconnectionsto this compo-

nent or any other, makesure the power

amplifieris Off andthepreamplifieris in the

Muteor Stand-bymode.Makesureall cable

terminationsareof thehighestquality, free

fromfrayedends,shorts,orcoldsolderjoints.

Input andOutputConnections

Topreventthe introductionof humor other

noiseinto the system,organizeall wiring

betweenthe KAV-250pandother system

componentsneatly. SeparateACwiresfrom

audiocables.

1. Connectthe cablesfromyour speakers

to theoutputterminalsof theamplifier.

TheKAV-250aamplifier utilizes five-

waybindingpostspeakerterminalsfor

the left andright channels.Thespeaker

terminalsacceptspadelugs, barewire,

bananaplugs,or pins. Theredterminals

are usedfor positive connectionsand

theblackterminalsareusedfor theneg-

ative connections.

2. Connectthe interconnect cablesfrom

yourpreamplifierto theinputterminalsof

theamplifier.

TheKAV-250aamplifier is equippedwith

balancedandsingle-endedinputs. The

balancedinputs usethree pin XLRcon-

nectorsandthe single-endedinputsuse

RCAconnectors.Krell®recommendsthe

useof balancedinterconnects.Balanced

interconnectsnotonlyhavetheability to

Page4 of 12 English KRELL

® KAV-250a

minimizesonic loss but also haveimmu-

nity to inducednoise,especiallyfor instal-

lations usinglongcablelengths..Balan-

ced connections have 6dB more gain

than single-ended connections. When

level matchingis critical, keepthis speci-

fication in mind.

WARNING

Useonlyoneset of inputsto theamplifierat a

time. TheKAV-250aamplifier is shippedwith

shorting pins in the XLRinputs. Thesepins

should remain in the XLRinputs if the

KAV-250aamplifier is operatingin the single-

endedmode.Whenthe shorting pin is insert-

ed, pins 1 and3 are shorted together. The

shorting pins mustbe removedto connectthe

KAV-250aamplifier for balancedoperation.

TheXLRpin configurationis describedbelow:

Pin1 Ground

Pin 2 Non-inverting(0

°)

Pin 3 Inverting (180

°)

3. Insert the ACpowercordinto the recepta-

cle located on the backof the KAV-250a

amplifier. Insert the otherendinto theAC

wallreceptacle.

4. Theamplifier is now~eadyfor operation.

SeeAmplifier Operation, on page7.

Linking Multiple Amplifiers--

Multi AmpThroughput

TM(MAT

Ti)

For systemscontainingmultiple amplifiers,

Multi AmpThroughput

(MAT

~M)simplifies

installations. MAT

~-M

providesa daisy-chain

systemoption that reduces installation

complexity and cabling requirements. To

usethis option, connectthe outputs of the

amplifier (either balancedvia XLRor single-

endedvia RCAconnectors)to the inputs of

anotheramplifier. Theoutput of the first

amplifier sendsthe preamplifier signal to

the nextamplifier in the chain.

12 VDC REMOTEPOWERIN

This input accepts12 volt poweron/off sig-

nals from other Krell components,as well

asfromother devicesthat incorporatea 12

volt poweron/off trigger output. Thisallows

for remoteturn on/off of the KAV-250awith

the poweractivation of anotherKrell com-

ponentas well as with with other compo-

nentsusedin a custominstallation.

12 VDC REMOTEPOWEROUT

This output sends12volt poweron/off sig-

nals to other Krell components,as well as

other devices that incorporate a 12 volt

poweron/off trigger input. This allows for

remoteturn on/off of the KAV-250awith the

poweractivation of another Krell compo~

nent as well as with other componentsused

in acustominstallation,

NOTE:Consult the owner’s manualof any

deviceusedin a custominstallation to take

full advantageof the remotecapability of

the KAV-250a.

KRELL

® KAV-250a English Page5 of 12

Configuring the KAV-250a

for Bridged Operation

TheKAV-250amaybe configured to operate

in a bridgedmode.Whenbridged,the amplifi-

er will deliver 1000wattsto an8 ohmload. To

implementthis configuration:

1. Turnthe KAV-250aoff.

2. Locatethe red switch onthe backof the

amplifier andslide it fromthe NORMAL

position to the BRIDGEDposition. The

numeral2 will appearonthe switch, when

the switchis in the BRIDGEDposition.

Connectthe interconnect cable to the

BRIDGEDinput, either balancedvia the

XLRconnector or single-ended via the

RCAconnector. Donot use both inputs

simultaneously. Connectthe speaker

cablesto the speakerterminals labeled

BRIDGED(-)and BRIDGED(+).The

lifier is nowreadyfor bridgedoperation.

THE KAV-250a BACKPLATEANDCONNECTIONSFOR BRIDGEDOPERATI()N

NOTE:The KAV-250amaybe configured for bridged operation using either

a single-endedinput (1) or a balancedinput (2)

1 Single-endedinput, for connection to a preamplifer

2 Balancedinput, for connection to a preamplifier

35-way binding post speaker terminals

4 Redswitch in bridged position, (with the numeral2 displayed)

5Single-endedoutput, for connection to another amplifier

6 Balancedoutput, for connection to another amplifier

7 12 volt trigger input

812 volt trigger output

LINE IN

RIGHT LEFT

OUTPUT OUTPUT

C) RIGHT ~ED LEFT ~NPUT)

(BRIDGED (~

0 0

KAV-250a

PowerAmplifier KRELL

® Industries, Inc.

45 Connair Road

Orange, CT 06477-3650

USA

Nouser serviceable parts inside

VOLTAGEFUSE

100-120MDA-20

200-240MDA-12 Q 50/60Hz

MADEINUSA

12VDCREMOTE

POWER

Page 6 of 12 English KRELL® KAV-250a

Amplifier Operation

It is easyto understandtheoperationof the

KAV-250aamplifier. However,great care

needsto beexercisedwhenoperatinga sys-

temthat includesthe KAV-250a,becauseof

the amplifier’s enormouspoweroutput.

Switchingbetweenactive sourceswithout

mutingthe preamplifier output, or bump-

ing/miscuinga cartridge, cangeneratelarge

transientsat lowfrequencies.TheKAV-250a

amplifier maygenerateenoughpowerwith

thesetransients to damagemostloudspeak-

ers. All switchingof sourcesshouldbedone

withthepreamplifierleveleithermutedorfully

attenuated.Donotchangeinputsto theampli-

fier whiletheamplifieris On.

NOTE:Care mustbe taken whensetting

high playbacklevels. Becauseof their

tremendousreserveof clean power,Krell

amplifierscansafelydrivespeakersto high-

er soundpressurelevels thanotherampli-

fiers. Alwaysturntheleveldownat thefirst

signof speakerdistress.

On~OffandStandbyOperation

Whenpoweringupanysystem,amplifiers

shouldalwaysbeturnedonlast andturnedoff

first.

1. Pressthepowerbuttononthe front panel

of theamplifier.Youwill hearaclick. The

amplifieris readyfor operation.

2. Withthepreamplifierin theMuteposition,

or ’the volumecontrolfully attenuated,

select a source.Turnthe volumecontrol

upto thedesiredlisteninglevel.

3. Whenturning the systemoff, lowerthe

volumeof the preamplifiercompletelyor

placeit into the Muteor Stand-byposi-

tion. Switchtheamplifierto Stand-byby

pressingthepowerbutton.It is nowsafe

to turnoff therestof thesystem.

SystemNoiseConsiderations

ACgroundingbecomescritical whencon-

nectinghighperformanceaudiocomponents.

Whenmixing andmatchingaudio compo-

nents,eachwiththeir owngroundpotential,a

lowfrequencyhummayoccurin oneor both

speakers.Thisoftenoccurswhenintroducing

¯ a newcomponentinto a system.

If there is a lowfrequencyhumemanating

from the speakers whenthe KAV-250a

amplifier is placedinto the system,follow

thesesimpletrouble-shootingstepsbefore

contactingyourauthorizedKrell dealer,dis-

tributor,orKrell®:

1. Checkall input andoutputconnections,

makingsuretheyareof soundconstruc-

tion. Withthe amplifier Off, removethe

interconnectwiringandturn theamplifier

On.If thehumdisappears,turntheampli-

fier Offandreinsertoneof theintercdn-

nectcables.Thenturntheamplifierback

On.If thehumreappearswithoneor both

interconnectsreinserted,theremaybea

defectivecable. Havethe interconnect

cablingcheckedbeforeproceeding.

2. If the interconnectsproveto besound,

youmaybeexperiencinga groundloop.

Thiscanoftenbeeasily eliminated.Con-

tactyourauthorizedKrelldealer,distribu-

tor,orKrell

®.

EnglishPage7 of 12 KRELL

® KAV-250a

Warranty

Krell®warrantsthis productto befree from

defects in material or workmanshipfor a

periodof five yearsfor circuitry andthree

yearsfor all mechanicalcomponentsfrom

the original dateof purchase.Shouldthis

productfail to performat anytimeduringthe

warranty,Krell

will repairit at nocostto the

owner,exceptasset forth in this warranty.

Transferof warrantyto asecondowneroccurs

automatically.PleasecontactKrell®to have

the nameonthe warrantychanged.Transfer

of warrantydoesnot extendthe durationof

theoriginal warrantyperiod.

NOTE:This warranty doesnot apply to

damagecausedbyacts of Godor nature.

Thewarrantyperiodbeginsonthe date of

retail purchaseasnotedontheretail sales

slip providedbyanauthorizedKrell dealer

ordistributor,oronthewarrantyregistration

cardsentto Krell®.In theeventthatanade-

quateproofof purchasedateis unavailable,

the warrantyperiodwill beginonthe date

the productwasoriginally shippedfromthe

factory.Thewarrantydescribedin this para-

graphshall bein lieu of anyotherwarranty,

expressorimplied,including,butnotlimited

to, anyimpliedwarrantyof merchantability

orfitnessfor a particularpurpose.Thereare

noWarrantieswhichexceedbeyondthose

describedin this document.If this product

doesnot performaswarrantedherein, the

owner’ssole remedyshall berepair. In no

eventwill Krell®

beliable for incidentalor

consequentialdamagesarising from pur-

chase,use,or inability to usethis product,

evenif Krell®

hasbeenadvisedof the pos-

sibility of suchdamages.

Thewarrantyfor this Krell productis valid

onlyin thecountryto whichthe productwas

originally shipped,throughthe authorized

Krell distributorfor thatcountry,andat the

factory. Theremayberestrictions onor

changesto Krell’s warrantybecauseof reg-

ulations within a specific country.Please

checkwith yourdistributor for a complete

understandingof the warrantyin yourcoun-

try.

Freightto thefactoryis yourresponsibility.

Returnfreight within the UnitedStates

(U.S.A.)is includedin thewarranty.If you

havepurchasedyourKrell productoutside

the U.S.A.andwishto haveit servicedat

the factory, all freight andassociated

chargesto thefactoryareyourresponsibili-

ty. Krell

will payreturnfreightto theU.S.A.-

basedfreight forwarderof your choice.

Freightandotherchargesto shipthe prod-

uct fromthe freight forwarderto youai’e

alsoyourresponsibility.

Theoperating voltage of this productis

determinedat the factory andcanonly be

changedbyanauthorizedKrell distributor or

at thefactory.Thevoltagefor this productin

the U.S.A.cannotbechangedfor six months

fromtheoriginal purchasedate.

Anyunauthorizedvoltageconversion,dis-

assembly,componentreplacement,perfo-

ration of chassis,updates,or modifica-

tions performedto the productwill void

thewarranty.

KRELL

® KAV-250a English Page8 of 12

ReturnAuthorization

Procedure

IMPORTANT:If youbefievetherois a prob-

lemwithyourunit, pleasecontactyourdeal-

er, distributor, or theKrell factoryimmedi-

ately Donot return anyunit to KrelPfor

repair withoutfirst discussingthe problem

and obtaining a Return Authorization

Number.

Toreturn a product, the owner

is requiredto:

¯ Obtaina ReturnAuthorization Number

(R/A number)and shipping address

fromthe Krell ServiceDepartment.

¯ Insureandacceptall liability for lossor

damageto the productduring shipment

to theKrell factoryandprepayall ship-

ping charges.Theproductmayalso be

handdeliveredif arrangementswith the

ServiceDepartmenthavebeenmadein

advance.Proof of purchasemaybere-

quiredfor warrantyvalidationat thetime

of handdelivery.

¯ Usethe original packagingto insurethe

safetransit of theproductto thefactory,

dealer, or distributor. Theuseof any

packagingmaterialotherthantheoriginal

packagingmaterials is not recommend-

ed.Krell®

may,at its discretion,returna

productin newpackagingandbill the

ownerfor suchpackagingif the product

received by Krell ®wasboxedin non-

standardpackagingor if the original

packagingwasso damagedthat it was

unusable.If Krell®

determinesthat new

packagingis required,theownerwill be

notified beforethe productis returned.

To purchaseadditional packaging,

pleasecontact your authorizedKrell

dealer,distributor, or the Krell Service

Departmentfor assistance.

Krell®is not responsiblefor anydamage

incurredin transit. Krell®

will file claimsfor

damagesas necessaryfor products dam-

agedin transit to the factory. Theowneris

responsiblefor filing claimsfor shippingdam-

agesthat occurduringthereturnshipment.

Replacementparts and/orproductswill be

furnishedon anexchangebasis only; any

partsand/orproductsreturnedto Krell®

for

exchangebecomethe propertyof Krell

®.

Noexpressedor implied warrantyis made

for anyKrell productdamagedbyaccident,

abuse,misuse,naturalor personaldisaster,

or unauthorizedmodification.

In theeventthat Krell®

receivesa product

for warrantyservice whichhasbeenmodi-

fied in anywaywithoutKrell authorization,

all warrantiesonthat productwill bevoid.

Theproductwill bereturnedto original fac-

tory layout specifications at the owner’s

expensebeforeit is repaired.All repairs

requiredafter the producthasbeenreturned

to original factory specification will be

chargedto the customer,at current parts

andlaborrates.

Tocontactthe Krell ServiceDe~artment

TEL 203-799-9954

Monday-Friday

9:00 AMto 5:00 PMEST

FAX 203-799-9796

E-MAILkrell @krellonline.com

KAV-250a

PRODUCT SERIALNUMBER

Toregister your productfor warrantybenefits,

complete and return the Warranty

Registration Card enclosedin the shipping

boxwithin 15 days of purchase.

Page9 of 12 English KRELL

® KAV-250a

Krell

Industries,Inc.

45 Connair Road

Orange,CT06477-3650USA

TEL203-799-9954 FAX203-799-9796

E-MAILkrell @krellonline.com

Specifications

FREQUENCYRESPONSE

20Hz-20KHz

.4Hz-170KHz

KAV-250a

+0.0,-0.1dB

+0.0,-3.0dB

OUTPUTPOWER,each channel driven

8 ohms 1,000W (bridged)

8 ohms 250 W

SIGNALTONOISERATIO

-118dB"A" weighted

DISTORTION

1KHz 0,06% THD

20KHz 0.25% THD

GAIN 26.4dB

INPUTSENSITIVITY

2.15 Vrms

INPUT IMPENDENCE

100Kohms

OUTPUTVOLTAGE

Peakto peak

RMS 138V

49 V

4 ohms 500 W

POWERCONSUMPTION

Idle 210 W

Max. 1850 W

DIMENSIONS

19wx 6.3hx 15.3din.

48.3wx16hx 38.9d cm

WEIGHT

Shipped

Unit only 57Ibs., 25.9kg

43Ibs., 19.5kg

All operationalfeatures,functions,specifications,and

3oliciesaresubjectto changewithoutnotification.

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