Krell Industries Three-Channel Power Amplifier KAV-250a/3 Bedienungsanleitung

Leader in Audio Engineering

KAV-250a

Stereo PowerAmplifier

KAV-250a/3

Three-ChannelPowerAmplifier

Instructionsfor Use,v 99.2

Owner’s Reference

KAV-250aStereo PowerAmplifier and

KAV-250a/3Three-Channel PowerAmplifier

Instructionsfor Use,v 99.2

Cover: KAV-250a/3 Three-ChannelPowerAmplifier

Krell Industries,Inc.

45 Connair Road

Orange, CT 06477-3650 USA

TEL 203-799-9954

FAX203-799-9796

E-MAILkrell @krellonline.com

WEBSITEhttp://www.krellonline.com

This product complieswith the EMCdirective (89/336/EEC)andthe low-voltage directive

(73/23/EEC).

WARNINGS

Theamplifier mustbeplacedona firm, level surfacewhereit is not exposedto dripping or

splashing.

Theventilation grids onthe top of the amplifier andthe spaceunderneaththe amplifier mustbe

unobstructedat all times during operation. Donot place flammablematerial aboveor beneath

theamplifier.

ContactyourauthorizedKrell dealer, distributor, or Krell beforeusinganydevicesdesignedto

alter or stabilize the ACpowerfor the KAV-250aor KAV-250a/3.

Beforeconnectingthe KAV-250aor KAV-250a/3,makesure the amplifier is off andany output

device(suchas a preamplifier) is in muteor stand-bymode.Makesure all cable terminations

areof the highestquality andfree fromfrayedends,short circuits, or coldsolderjoints.

Useonlyoneset of inputsto the amplifier at a time.

After reconfiguring for MAT,do not usemorethan oneinput at the sametime.

After bridging, donot usebothinputs at the sametime.

THEREARE NO USERSERVICEABLEPARTSINSIDE ANY KRELL PRODUCT

PleasecontactyourauthorizedKrell dealer, distributor, or Krell if youhaveanyquestionsnot

addressedin this reference manual.

Thisproductis manufacturedin theUnitedStatesof America.Krell®

is aregisteredtrademarkof Krell

Industries,Inc., andis restrictedfor usebyKrellIndustries,Inc., its subsidiaries,andauthorizedagents.

Multi AmpThroughput

TM is a trademarkof Krell Industries,Inc. All othertrademarksandtradenamesare

registeredto their respectivecompanies.

Contents

INTRODUCTION’

DEFINITION OF TERMS

UNPACKING

PLACEMENT

ACPowerGuidelines

FRONTPANELDESCRIPTION: KAV-250a

BACKPANELDESCRIPTION: KAV-250a

FRONTPANELDESCRIPTION:KAV-250a/3

BACKPANELDESCRIPTION:KAV-250a/3

CONNECTINGTHEKAV-250a or KAV-250aJ3 AMPLIFIER

TO YOURSYSTEM

Input andOutputConnections

OPTIONAL SYSTEMCONFIGURATIONS

Multi AmpThroughput

Bridged Operation

Examplesof ConnectionScenarios

AMPLIFIER OPERATION

On/Off andOperation

AMPLIFIER TROUBLESHOOTING

Howto Troubleshoot SystemNoise

QUESTION AND ANSWER

WARRANTY

RETURNAUTHORIZATION PROCEDURE

SPECIFICATIONS

Page

KAV-250aand KAV-250a/3Amplifiers iii

Illustrations

FIGURE1

FIGURE2

FIGURE3

FIGURE4

FIGURE5

The KAV-250aFront Panel

The KAV-250aBack Panel

TheKAV-250a/3Front Panel

The KAV-250a/3Back Panel

Reconfiguring the KAV-250afor MAT

or BridgedOperation

FIGURE6 Reconfiguring the KAV-250a/3for MAT

or BridgedOperation

Page

iv KAV-250aand KAV-250a/3Amplifiers

Introduction

Thankyou for your purchaseof the Krell KAV-250aStereoPowerAmplifier or

KAV-250a/3Three-ChannelPowerAmplifier..

TheKAV-250aandKAV-250aJ3amplifiers provide substantial two- andthree-channel

output powerthat delivers realistic musicproductionat anexceptionalvalue. These

amplifiers canbecustomizedwith a variety of optional systemconfigurations: Multi

AmpThroughput(MAT),bridged operation, and high powermonooperation. These

options provide a wider range of poweroutputs andconnectionoptions. Boththe KAV-

250aandKAV-250a/3amplifiers provide balancedandsingle-endedinputs for

completecompatibility with other components.TheKAV-250aand KAV-250a/3

amplifiers canbeoperatedusing the 12VDCtrigger for other components.Either

amplifier integrates seamlesslyhometheater or whole-housesystems.

This referencemanualcontains importantinformation onplacement,installation, and

operation of the KAV-250aandKAV-250a/3amplifiers. Pleaseread this information

carefully. Athoroughunderstandingof thesedetails helpsensuresatisfactory operation

andlong life for your KAV-250aor KAV-250aJ3amplifier andrelated system

components.

Definition of Terms

Multi AmpThroughput

Aninternal connectionoption that sendsthe samemusicsignal to all amplifier channels

using onebalancedor single-endedconnection. MATreducesinstallation complexity

andcabling requirementsin systemscontainingmultiple amplifiers. MATalso allows a

variety of connectionscenarios,including poweringloudspeakersthat havetwosets of

binding postsandindependentlypoweringmultiple pairs of stereo loudspeakersto

extendthe listening environmentthroughoutyour home.

Bridging

Aninternal connectionoption that links twoamplifier channelsto operateasone

combinedamplifier channel,greatly increasing the channel’spoweroutput.

Whenthe powerbutton onthe front panel is pressedandthe blue powerLED

illuminates, the amplifier is onandreadyto playmusic.

Off

Whenthe powerbutton on the front panel is pressedandthe blue powerLEDturns off,

theamplifieris off.

KAV-250aand KAV-250a/3Amplifiers 1

Unpacking

Openthe shipping box, whichcontains:

1 amplifier unit (packedin foamend-caps)

2 ribbon connectioncables

KAV-250afuses:

2 AGC-8(~ ’amp)

1 slow-blow(20 ampfor 100/120V or 12 ampfor 220/240V)

KAV-250a/3fuses:

3 AGC-.8 ~ amp)

1 slow-blow(20 ampfor 100/120V or 12 ampfor 220/240V)

1 12 VDCoutput (12 Vtrigger) cable

1 IECconnector(ACpower)cord

1 T-15Torx wrench

1 packetcontainingthe owner’sreferencemanualandthe warrantyregistration

card.

Graspthe undersideof the foamend-capsthat encasethe amplifier andlift the

amplifier straight outof theshippingbox.

Placethe amplifier in a safelocation andremovethe protective plastic wrapping.

Notes

If anyof theseitemsare not includedin the shippingbox,pleasecontactyour

authorizedKrell dealer,distributor, or Krell for assistance.

Saveall packingmaterials.If youshipyouramplifier in the future, repackthe unit in its

original packagingto prevent trans# damage.SeeReturnAuthorization Procedure,

onpage29, for moreinformation.

2KAV-250aand KAV-250aJ3Amplifiers

Placement

Before you integrate the KAV-250aor KAV-250a/3into your system, review the

following guidelinesto choosethe location for the component.Thiswill facilitate a

clean,trouble-freeinstallation.

TheKAV-250aandKAV-250aJ3require at least two inches (5 cm)of clearance

eachside andat least twoinches(5 cm)of clearanceabovethe componentto provide

adequateventilation.

Youramplifier doesnot requireanytype of special rackor cabinetfor installation. For

the dimensionsof your amplifier seeSpecifications, on pages30 and31.

Placethe amplifier as close to the loudspeakersas possible andkeepthe speaker

cable length to a minimum.Speakercable addsimpedanceto the load the amplifier

mustdrive, regardlessof the cable’s gauge.Krell amplifiers drive the lowest

impedanceswith ease, but long speakercables reducethe maximumpowerthat is

deliveredto the loudspeakers.

AC POWER GUIDELINES

Krell recommendsoperating eachamplifier from a dedicated15-ampACpowerline.

For maximumpoweroutput, operate the KAV-250aor KAV-250a/3amplifier from a

dedicated 20-ampACpowerline.

KAV-250aand KAV-250a/3Amplifiers 3

FIGURE 1 THE KAV-250a FRONTPANEL

1 2

1 PowerButton

2 PowerLED

Front Panel Description: KAV-250a

SeeFigure 1 on page4

1 Power Button

Usethis button to turn the KAV-250apoweron andoff andalso to switch the 12 VDC

output(12Vtrigger) onandoff.

2 Power LED

Theblue powerLEDilluminates whenthe amplifier is on.

KAV-250aand KAV-250a/3Amplifiers 5

FIGURE 2 THE KAV-250a BA(;K PANEL

11 12 10 13

BalancedInputs

3 Right Input

4 Left Input (Bridged)

Single-endedInputs

5 Right Input

6 Left Input (Bridged)

Amplifier ChannelOutputs

7 Right Output(Bridged-)

8 Left Output(Bridged+)

Fuses

9 AGC~ Fuses

10 Line Fuse

RemoteControls

11 12 VDCRemotePowerOut

12 12 VDCRemotePowerIn

Power

13 IEC PowerConnector

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