Krell Industries Power Amplifier KAV-150a Guida rapida

TheLeaderin AudioEngineering KAV-150a

PowerAmplifier

Instructions for Use,v 98.0

Owner’s Reference

Contents

KAV-150a

PowerAmplifier

Krell®Industries,Inc.

45 Connair Road

Orange, CT 06477-3650 USA

TEL 203-799-9954

FAX203-799-9796

E-MAILkrell@ krellonline.com

WEBSITE www.krellonline.com

INTRODUCTION

UNPACKING

PLACEMENT

CabinetryConsiderations

ACPowerGuidelines

CONNECTINGTHE KAV-150a

TO YOURSYSTEM

Input andOutputConnections

Configuring the KAV-150a

for BridgedOperation

AMPLIFIER OPERATION

On/Off andStand-byOperation

SystemNoise Considerations

WARRANTY

RETURNAUTHORIZATION

PROCEDURE

SPECIFICATIONS

Page

Back Cover

Industries,Inc.All rightsreserved P/NI960101900088

CEMarking

This product complieswith the EMCdirec-

tive (89/336/EEC) and the low-voltage

directive (73/23/EEC).

Introduction

Thankyoufor your purchaseof the Krell

KAV-150a Power Amplifier. The name

Krell ®has alwaysrepresentedcomponents

that are the premier performersin their

product categories. TheKAV-150apower

amplifiercontinuesin this Krell®tradition

TheKAV-150ais a stereo amplifier that

maybe bridged into monauraloperation.

Designed as a compact componentwith

exceptional sound, the KAV-150amaybe

interfaced easily into multi-amplifier sys-

temsusingthe 12V trigger andthe bridg-

ing capability. TheKAV-150ausesproven

Krell®circuitsbuilt with thesamehighqual-

ity resistors, outputdevices,andinternal

electrical componentsusedin all other

Krell®products. Frominput to output, the

KAV-150ausesdiscrete, fully complemen-

tary circuitry. All circuits upto the driver

stage operate in pure Class A. The

KAV-150a employs a wide bandwidth

designwith a verylownegativefeedbackfor

sonic accuracy throughout the frequency

spectrum.

This owner’s reference manualcontains

important information on the placement,

installation, andoperationsof theKAV-150a.

Pleasereadthis information carefully. A

thorough understandingof these details

will helpinsuresatisfactory operationanda

long life for the KAV-150aandrelated sys-

tem components.

TheKAV-150ais backedby a comprehen-

sive customersatisfaction policy andone

of the mostadvancedservice facilities in

the industry. For detailed information on

the termsandconditions of service, please

consult your warrantyregistration card, or

contactyourdealer, distributor, or Krell

®.

Unpacking

1. Openthe boxandremovethe top layer of

foam.Youwill seetheseitems:

1 KAV-150a

1 ACpowercord

2sparespeakerfuses

1 packetcontaininganintroductory

letter fromDanD’Agostino,C.E.O.,

the Owner’sReferenceandthe

WarrantyRegistration Card

Note

ff anyof theseitemsarenotincluded,please

contactyourauthorizedKrel/~ dea/eror dis-

tributor immediate/yfor assistance.

2. Carefully removethe unit andacces-

sories fromthe box. Removethe protec-

tive plastic wrapfromtheunit.

Note

Saveall packingmaterials, ff youmust

ship your KAV-150ain the future, repack

theunit in its original packagingto prevent

transit damage.

THERE ARE NO USER-SERVICEABLE

PARTSINSIDE ANY KRELL

® PRODUCT

Pleasecontactyourauthorizeddealer,

distributor, or KrelP, if youhaveany

questionsnot addressedin this refer-

ence manual.

KRELL® KAV-150a English Page3 of 12

Placement

WARNING

Theamplifier mustnot be locatedwhereit

couldbe exposedto dripping or splashing

fluids.

Beforeyouinstall the KAV-150ainto your

system,reviewthe following guidelines to

choosethe location for the KAV-150a.This

will facilitateaclean,trouble-freeinstallation.

TheKAV-150adoesnot require any type of

specialrackor cabinetfor installation.Forthe

dimensions of the KA V- 150a, see

Specificationsonpage10.

PlacetheKAV-150aamplifier ona firm level

surfaceawayfromdirt or moisture.Ideally,

the amplifier shouldbeplacedasclose to

the speakersas possible. Runlong bal-

ancedinterconnect cablesto the amplifier

andkeepthe speakercablelength to a min-

imum.Speakercable adds impedanceto

theloadtheamplifier mustdrive, regardless

of thecable’sgauge.All KrelPamplifierswill

drive the lowestimpedanceswith ease,but

whenimpedance is added due to long

cablelengths, amplifier poweris wastedin

the cable. Longspeakercablesreducethe

maximumpowerthat can be delivered to

the speakers.

CABINETRY CONSIDERATIONS

TheKAV-150aamplifier can becomequite

warmundernormaloperation. Install the

KAV-150ain a location that providesunob-

structedventilation.

IMPORTANT

Theventilation grids ontopof theKAV- 150a

needto beunobstructedat all timesduring

operation. Donot place flammablematerial

on top of or beneath the KAV-150a.For

installation inside cabinet~extra ventila-

tion maybe necessary. Makesure the

KAV-150ahas adequateair circulation.

Generallytwo inchesof clearanceon each

side of the amplifier andeight inches of

clearanceabovethe amplifier will provide

adequate ventilation. In more extreme

instances, small fans can aid in removing

excessheat from internal spaces.Contact

yourdealer, distributor, or Krell®for more

information.

AC POWERGUIDELINES

For best performance, Krell ®recommends

using a dedicatedACpowerline rated at a

minimumof fifteen ampswith the KAV-150a

amplifier. TheKAV-150aamplifier should

only be operatedwith the powercord sup-

plied. Pleaseconsultyourdealer,distributor,

or Krell®beforeusinganydevicesdesigned

to alter or stabilize the ACpowerfor the

KAV-150a.

Page4 of 12 English KRELL® KAV-150a

Connectingthe KAV-150a

to YourSystem have6dBmoregain than single-ended

connections.Whenlevel matchingis crit-

ical, keepthis specificationin mind.

WARNING

Whenmakingconnections to this compo-

nent or any other, makesure the power

amplifieris off andthepreamplifieris in the

muteor stand-bymode.Makesure all cable

terminationsareof thehighestquality, free

fromfrayedends,shorts,orcoldsolderjoints.

INPUT AND OUTPUTCONNECTIONS

Topreventthe introduction of humor other

noiseinto the system,organizeall wiring

betweenthe KAV-150aand other system

componentsneatly. Separate ACwires

fromaudiocables.

1. Connectthe cablesfrom your speakers

to theoutputterminalsof theamplifier.

TheKAV-150aamplifier utilizes five-

waybinding post speakerterminals for

theleft andright channels.Thespeaker

terminalsacceptspadelugs, barewire,

bananaplugs, or pins. Thered termi-

nals are usedfor positive connections

andthe blackterminalsareusedfor the

negativeconnections.

2. Connectthe interconnect cables from

yourpreamplifierto theinputterminalsof

theamplifier.

TheKAV-150aamplifier is equipped

with balancedandsingle-endedinputs.

Thebalancedinputs usethree pin XLR

connectorsandthe single-endedinputs

use RCAconnectors. Krell ® recom-

mendsthe use of balancedintercon-

nects. Balancedinterconnectsnot only

havethe ability to minimizesonicloss

but alsohaveimmunityto inducednoise,

especiallyfor installations usinglong

cable lengths. Balancedconnections

WARNING

Useonlyoneset of inputsto theamplifierat

a time. TheKAV-150aamplifier is shipped

with shortingpins in the XLRinputs. These

pins shouldremainin the XLRinputs if the

KAV-150aamplifier is operatingin the sin-

gle-endedmode.Whenthe shorting pin is

inserted, pins 1and3 areshortedtogether.

Theshorting pins mustbe removedto con-

nect the KAV-150aamplifier for balanced

operation.

The XLR pin

below:Pin1

Pin 2

Pin 3

configuration is described

Ground

Non-inverting(0

°)

Inverting(180

°)

Connectthe receptacle endof the AC

powercordto the IECpowerconnectorin

the backpanelof the KAV-150a.Connect

the ACpowercordwall pluginto a stan-

dardACwalloutlet.

4. Theamplifier is nowreadyfor operation.

SeeAmplifier Operation, on page6.

12 VDCREMOTEPOWERIN

This input accepts 12 volt poweron/off

signals from other Krell ®components,as

well as from other devices that incorpo-

rate a 12volt poweron/off trigger output.

This allows for remoteturn on/off of the

KAV-150awith the poweractivation of

anotherKrell ®componentas well as with

other components used in a custom

installation.

KRELL®KAV-150a English Page5 of 12

12 VDC REMOTEPOWEROUT

Thisoutput sends12volt poweron/off sig-

nals to other Krell®components,aswell as

other devicesthat incorporate a 12 volt

poweron/off trigger input. This allowsfor

remoteturn on/off of the KAV-150awith the

poweractivation of anotherKrell®compo-

nent as well as with other componentsused

in a custominstallation.

Note

Consu/tthe owner’smanua/of any device

usedin a custominsta//ation to take furl

advantageof the remotecapabi/ity of the

KAV-150a.

CONFIGURING THE KAV-150a

FOR BRIDGED OPERATION

TheKAV-150amaybe configured to operate

in abridgedmode.Toimplementthis configu-

ration:

1. Turnthe KAV-150aoff.

2. Locatethe red switchonthe backof the

amplifier andslide it fromthe NORMAL

position to the BRIDGEDposition. The

numera/2 will appearonthe switch,when

theswitchis in the BRIDGEDposition.

3. Connectthe interconnect cable to the

BRIDGEDinput, either balancedvia the

XLRconnectoror single-endedvia the

RCAconnector. Donot use both inputs

simultaneously. Connectthe speaker

cablesto the speakerterminalslabeled

BRIDGED(-)and BRIDGED(+).The

lifier is nowreadyfor bridgedoperation.

Amplifier Operation

It is easyto understandtheoperationof the

KAV-150aamplifier. However,great care

needsto beexercisedwhenoperatinga sys-

temthat includes the KAV-150a,becauseof

the amplifier’s enormouspoweroutput.

Switching betweenactive sourceswithout

mutingthe preamplifier output, or bump-

ing/miscuinga cartridge, cangeneratelarge

transients at lowfrequencies.TheKAV-150a

amplifier maygenerateenoughpowerwith

thesetransients to .damagemostloudspeak-

ers. All switchingof sourcesshouldbedone

withthepreamplifierleveleithermutedorfully

attenuated.Donotchangeinputsto theampli-

fier whiletheamplifieris on.

Note

Caremustbe takenwhensetting high p/ay-

back leve/s. Becauseof their tremendous

reserve of c/ean power,Kre//~ amp/ifiers

can safe/y drive speakersto higher sound

pressure /evels than other amplifiers.

A/waysturn the/eve/downat the first sign

of speakerdistress.

ON/OFF AND STANDBY OPERATION

Whenpoweringup any system, amplifiers

shouldalwaysbeturnedonlast andturnedoff

first.

1. Pressthe powerbuttononthe front panel

of the KAV-150aPowerAmplifier.Youwill

heara click. Theamplifier is readyfor

operation.

2. Withthe systempreamplifier in the mute

position,orthevolumecontrolfully atten-

uated, select a source.Turnthe volume

controlupto thedesiredlisteninglevel.

3. When.turning the systemoff, lowerthe

volumeof the systempreamplifier com-

pletely or placeit into themuteor stand-

byposition. TurntheKAV-150aoff. It is

nowsafeto tumoff therest of thesystem.

Page6 of 12English KRELL®KAV-150a

SYSTEM NOISE CONSIDERATIONS

ACgrounding becomescritical whencon-

nectinghigh performanceaudiocomponents.

Whenmixing and matching audio compo-

nents,eachwith their owngroundpotential, a

low frequencyhummayoccurin oneor both

speakers.Thisoftenoccurswhenintroducing

a newcomponentinto a system.

If there is a low frequencyhumemanating

from the speakers whenthe KAV-150a

amplifier is placedinto the system,follow

these simpletroubleshooting steps before

contactingyourauthorizedKrelPdealer,dis-

tributor,orKrell®:

1. Checkall input andoutput connections,

makingsure theyare of soundconstruc-

tion. Withtheamplifieroff, removethein-

terconnectwiring andturn the amplifier

on.If thehumdisappears,turn the ampli-

fier off andreinsert oneof theintercon-

nectcables.Thenturn theamplifier back

on. If the humreappearswith oneor both

interconnectsreinserted, there maybea

defective cable. Havethe interconnect

cabling checkedbeforeproceeding.

If the interconnectsproveto be sound,

youmaybe experiencinga groundloop.

Thiscanoften beeasily eliminated.Con-

tact yourauthorizedKrelPdealer,distrib-

utor,or Krell

®.

KRELL®KAV-150a English Page7 of 12

Warranty

Krell®

warrantsthis productto befree from

defects in material or workmanshipfor a

periodof five yearsfor circuitry andthree

years for all mechanicalcomponentsfrom

the original date of purchase.Shouldthis

productfail to performat anytime during

thewarranty,Krell®will repairit at nocost

to the owner,exceptas set forth in this

warranty. Transferof warrantyto a second

owneroccurs automatically. Pleasecon-

tact Krell ®to havethe nameon the war-

ranty changed.Transfer of warranty does

not extendthe durationof the original war-

rantyperiod.

Note

This warranty doesnot apply to damage

causedby acts of Godor nature.

Thewarrantyperiod beginson the date of

retail purchaseasnotedontheretail sales

slip providedbyanauthorizedKrell®deal-

er or distributor, or onthewarrantyregis-

tration cardsentto Krell®.In theeventthat

an adequateproof of purchase date is

unavailable,the warrantyperiodwill begin

on the date the product wasoriginally

shipped from the factory. Thewarranty

describedin this paragraphshall bein lieu

of anyother warranty,expressor implied;

including, but not limited to, anyimplied

warrantyof merchantabilityor fitness for a

particular purpose. There are no war-

ranties which exceed beyond those

describedin this document.If this product

doesnot performas warrantedherein, the

owner’ssole remedyshall be repair. In no

eventwill Krell®beliable for incidentalor

consequential damagesarising from pur-

chase,use,or inability to usethis product,

evenif Krell®hasbeenadvisedof the pos-

sibility of suchdamages.

Thewarrantyfor this Krell®

productis valid

only in the country to whichthe product

wasoriginally shipped,throughthe autho-

rized Krell®distributor for that country,and

at thefactory. Theremayberestrictions on

or changesto Krell’s warranty becauseof

regulations within a specific country.

Pleasecheckwith your distributor for a

completeunderstandingof the warrantyin

your country.

Freightto thefactoryis yourresponsibility.

Return freight within the United States

(U.S.A.)is includedin the warranty.If you

havepurchasedyour Krell ® product out-

side the U.S.A. andwish to haveit ser-

vicedat the factory, all freight andassoci-

ated charges to the factory are your

responsibility. Krell®will payreturnfreight

to the U.S.A.-basedfreight forwarder of

your choice. Freight andother chargesto

ship the productfromthe freight forwarder

to youarealso yourresponsibility.

Theoperating voltage of this product is

determinedat the factory andcanonly be

changedby an authorizedKrell®distributor

or at the factory. Thevoltagefor this prod-

uct in the U.S.A.cannotbechangedfor six

monthsfrom the original purchasedate.

Anyunauthorized voltage conversion,

disassembly, componentreplacement,

perforation of chassis, updates, or

modifications performedto the product

will voidthe warranty.

Page8 of 12English KRELL®KAV-150a

ReturnAuthorization

Procedure

IMPORTANT

ff youbelievethere is a problemwith your

component,pleasecontactyourdealer, dis-

tributor, or theKrell®factoryto discussthe

problembefore you return the component

for repair. To expedite service, you may

wish to completeande-mail the Service

RequestFormon our website at:

ww~.krellonline. com

Toreturna productto Krell®,pleasefol-

low this procedureso that wemay

serveyoubetter:

1. Obtain a Return Authorization Number

(R/A number) and shipping address

fromthe Krell®ServiceDepartment.

2. Insureandacceptall liability for lossor

damageto the product during shipment

to theKrell®factoryandprepayall ship-

ping charges. Theproduct mayalso be

handdeliveredif arrangementswith the

Service Departmenthavebeenmadein

advance.Proof of purchasemaybe re-

quiredfor warrantyvalidationat thetime

of handdelivery.

3. Usethe original packagingto insure the

safetransit of theproductto thefactory,

dealer, or distributor. Theuseof any

packagingmaterialotherthantheoriginal

packagingmaterials is not recommend-

ed.KrelPmay,at its discretion, returna

product in 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, the ownerwill be

notified beforethe productis returned.

To purchase additional packaging,

please contact your authorized Krell

dealer,distributor, or the Krell®Service

Departmentfor assistance.

Krell ®is not responsible for any damage

incurredin transit. KrelPwill file claimsfor

damagesas necessaryfor products dam-

agedin transit to the factory. Theowneris

responsiblefor filing claimsfor shippingdam-

agesthat occurduringthe return shipment.

Replacementparts and/or productswill be

furnished on an exchangebasis only; any

parts and/orproductsreturnedto Krell®for

exchangebecomethe property of Krell

®.

Noexpressedor implied warranty is made

for anyKrell®productdamagedby accident,

abuse,misuse,naturalor personaldisaster,

or unauthorizedmodification.

In theeventthat Krell®

receivesaproductfor

warrantyservicewhichhasbeenmodifiedin

anywaywithoutKrell®authorization,all war-

ranties on that productwill be void. The

productwill bereturnedto original factory

layoutspecifications at theowner’sexpense

beforeit is repaired.All repairsrequiredafter

the product hasbeenreturned to original

factory specification will bechargedto the

customer,at currentpartsandlaborrates.

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-150a

PRODUCT SERIALNUMBER

Toregister yourproductfor warrantybenefits,

completeandreturn the WarrantyRegistration

ICardenclosedin the shippingboxwithin 15days

of purchase.Thankyou.

KRELL

® KAV-150a English Page9 of 12

Krell®Industries,Inc.

45ConnairRoad

Orange,CT06477-3650USA

TEL203-799-9954FAX203-799-9796

E-MAIL[email protected]

WEBSITEwww.krellonline.com

KAV-150a

PowerAmplifier

Specifications

FREQUENCYRESPONSE

20 Hz-20kHz+0.0, -0.1 dB

.5 Hz-150kHz+0.0, -3.0 dB

OUTPUTPOWER,each channel driven

8 Ohms 600W(bridged)

8 Ohms 150 W

SIGNALTONOISERATIO

112dB,"A" weighted

DISTORTION

1 kHz 0.06% THD

20 kHz 0.25% THD

GAIN 25.8 dB

INPUTSENSITIVITY

1.8 Vrms

INPUT IMPENDENCE

100K Ohms

OUTPUTVOLTAGE

Peakto peak

RMS 116V

41 V

4 Ohms 300 W

POWERCONSUMPTION

Idle 40 W

Max. 600 W

DIMENSIONS

19wx 3.7hx 15.5din.

47.5wx 9.25h x 38.75dcm

WEIGHT

Shipped

Unit only

33Ibs., 14.9kg

25Ibs., 11.4 kg

All operationalfeatures,functions,specifications,and

policiesaresubjecttochangewithoutnotification.

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