Krell Industries Power Amplifier KST100 Kurzanleitung

A, INTRODUCTION

Thankyou for your purchase of the KRELLKST-100

poweramplifier.Thisamplifier represents the latest

evolution ~n amplifier technologyand incorporates many

innovativedesign features.

Toobtain the best performancefrom. your KST-100,

careful attention sfiould be paidto placement,installation

andoperation. Athoroughunderstandingof these details

will help insure satisfactory operationandlonglife for

the KST-100and related system components.

This Owner’sReferenceis divided into several sections,

eachdesignedto perforn}_,a different function. Asyou

.read throughthis Owners Referencey~ouwill becgme

19etter acquaintedwiththe features andfunctionstlaat

makethe-KST-100a superb value. AQuestion and An-

swer section is also included whereanswersto common

questions are provided. Shouldyou haveany questions or

suggestionspIease feel free to contact yourauthorized

dealer or the KRELLstaff for assistance.

In the unlikely, event that your.KST-1.00shouldrequire

serviceyouwill be pleased_to k~nowthat it is backedbya

c.omprehensiveCustomerbatistaction policy and one of

tlae mostadvancedservicefacilities in the industry.~t~or

detailed informationon the termsand conditions ot ser-

vice, please consult yourwarranty.registration card, your

authorized KRELLDealer or Distributor.

TABLE OF CONTENTS

4UNPACKING AND ASSEMBLY

5BASIC INSTALLATION AND OPERATION

6 INPUT AND OUTPUT CONNECTIONS

8AMPLIFIER OPERATION

9PROTECTION CIRCUITRY

10 MONAURAL CONVERSION OPERATION

11 REAR PANEL DESCRIPTIONS

12 QUESTIONS AND ANSWERS

14 SPECIFICATIONS

15 WARRANTYAND SERVICE INFORMATION

B. UNPACKING AND ASSEMBLY

NOTE:Doto the weightof the KST-100it is s.trongly

advised that unpackingand placementis completedby at

least twoindividuals.

1. Openthe boxon one end.

2. Foldbackthe flaps onall four sides of the boxand

carefully roll it overonto the exposedend.

3. Pull the boxstraight up andoff exposingthe foam

packingmaterial.

4. Laythe foamcontainer downon the floor and pull off

the top section.

Thefollowingitems will nowbe visible:

KST-100stereo amplifier

Warrantycard

ACpower cord

Rubber bottoms

NOTE:If any of these items are not included please

contact yourauthorized dealer immediatelyfor assis-

tance.

5. Pull the amplifier out of the remaininglayer of foam.

6. Removethe plastic bag fromthe amplifier.

NOTE:Saveallpacking materials. If you mustship. your

KS.T-100in the future, repack,the unit in its original

packagingto prevent transit damage.

CAUTION:Donot connect the power cord into the AC

mainsbefore completingthe Installation section.

C. BASIC INSTALLATION

AND OPERATION

1. Place the KST-100on a firm level surface awayfrom

excessivedirt or moisture.Ideally the amplifier shouldbe

placedas close to. the speakersas possible. It is always

preferable to runlong_interconnectcables to the amplifier

andkeep speaker calSle length to.a minimum=Speal~er

cable does addan impedanceat the output ot the ampli-

fier, regardless of the cable’s g.uage. AIIKRELLamplifi-

ers wilI drive the lowestimpeclanc,es withease. When

impedanceis added,the amplifiers poweris literally

wastedin driving cable. Longspeakercables reduce the

maximumpowerthat can be delivered to the speakers.

2. Amplifiers dissipate muchof the powerthey consume

in heat. TheKST-1~00shouldbe installed in a location

that providesunobstructedventilation. If youhavet.o

install the unit onshelvesor in a cabinet, extra ventilation

maybe necessary. This can be accomplishedwith "whis-

per"-type fans. Consultyourdealer f-or assistance.

Generally,withthe front andrear of a cabinetopen,2-3

inches of clearance oneachside and8 inches of clear-

anceabovethe amplifier should provide adequateventi-

lation.

Theexact dimensionsfor the KST-100are in the Specifi-

cations Section below.

3. The KST-100should have a dedicated line and should

only be operated with the powercord supplied. Useof

other powercords maydamagethe ampIifier or void its

warranty. Please consult KRELLor your dealer BEFORE

using a~nydevicesdesignedto alter or stabilize the AC

pgwertor the KST-100.If youhave any questions about

placementor ACpowerconditions please consult

KRELL.

4. Thefeet on the KST-100can be used in several differ-

ent ways. Theyare madefrom machinedDelrin and are

supplied with separate threaded rubber bottoms. The

rubber bottomscan be screwedinto the feet tor protec-

tion of fragile surfaces suchas hardwoodfloors or furni-

ture. For use on rugs, werecommendusing.the feet wi.th-

out the rubber bottoms.KST-100feet can also accept tlae

KRELLAMDs(Acoustic Mass Damper). These improve

the amplifier’s sonic performancein mostinstallations.

D. INPUT AND OUTPUT

CONNECTIONS

CAUTION:Whenmaking connections to this component

or any other, makesure the poweramplifier is OFFand

the preamplifier is in the MUTEor STANDBYmode.

1. Connectthe speakercables.to. the outputterminalsof

the amplifier. Tile KS~T-100utilizes twosets of parallel

5-w~ybindingposts tor the left andright channels.This

confi~gurationmakescable connectionsand bi-wiring

simple.

NOTE:Thebinding, posts are of the highest quality but

will breakif over.tigla.tened.In.se.rt wireor spadeluginto

the connectoranOtighten until there is no movement

fromthe cable.

CAUTION:Makesure all cable terminations are of the

highest quality, free fromfrayedends, shorts or cold

solderjoints.

2. Connectthe interconnect cables fromyour preampli-

fier to the input of the KST-100.

Thewiring to and fromthe amplifier, andall components

in general, should be arranged ma neat, organizedman-

net. Specifically_, ACwires shouldbe separated from

audio wires. Ttiis practice avoids humor other unwanted

noise frombeing inducedinto the system.

TheKST-100has balancedand Single-endedi,np.uts. The

balancedinputs use 3-pin XLRconnectors anti the

single-ended inputs use standard RCAconnectors.

CAUTION:Useonly one input to the amplifier at a time.

TheKST-100is shipped with shorting pins in the XLR

inputs. Thesepins sliould remainin the XLRinputs if

you are operating the KST-100in the single-ended mode.

.Whent.he shortingpinis inserted, pin 1 andpin 3 are

shorted together. Tile shorting pins mustbe removedto

connectthe KST-100for balancedoperation.

Thepin assignment for the XLRis:

pin _1-=shield (ground) .

p!n 2 = non-inverting~nput(hot)

p~n3 - inverting input

NOTE:TheRCAcenter conductor for each channel is

wiredjn,parallel withpin 2, the non-inv.ertedinput. Only

oneot tlaese inputs shouldbe connecteclto a preamplifier.

3. Insert the ACpowercordinto the receptacle located on

the backof the KST-100.Insert the other endinto the

wallACr_.eceptacle. (Referto sectionC, BasicInstalla-

tion and Operation, for ACpowerrequirements)

Eo AMPLIFIER OPERATION

1. Pushthe blackbreakertypeswitc.h on the front of the

amplifier to turn it on. TheLEDin the switchwill illumi-

nate.

Whenturningonthe system,the a _m,plifier shouldalways

be last. Uponturn-on, the amplifier s outputs are not

connectedtothe speakers. After the protection circuits

havedeterminedthat the unit has completelystabilized,

the.speaker relays will be engaged.YouwilI hear a click

at th~s point. Theamplifier is nowreadyto use. The

amplifier will be at temperatureandsoundits best after

approximately30 minutes.

2. Withthe preamplifie.r in the Muteposition, or volume

control fully attenuated, select a source. Turnthe volume

control upto yourdesired listening level.

3. Understandingthe operationof the amplifier !s very

easy. Equallyimportantis an understandi.ngof the care

that should be exercised whenoperating the systemas a

whole,in relation to the enormouspoweroutput of the

KST-100.Simplemistakes, such as switching between

active sources withoutmutingthe preamplifier output, or

bumping/miscuinga cartridge., can genera~telarge tran.-

sients at lowfrequencies.Withthis type9t transient the

KST-100can generate enoughpowerto damagemost

loudspeakers. All switching of sources shouldbe done

withthe preamplifierlevel either mutedor fully attenu-

ated. Inputs to the amplifier shouldnot be changedwhile

the amp-lifteris on.

NOTE:Care must b.e taken whensetting high playback

levels. Becauseof their tremendousreserve of-clean

power,KRELLamplifiers safely drive speakers to higher

soundpressure levels than other amplifiers. Thisalso .

meansdriving the speakersto their fimit. Alwaysturn the

level downat the first sign of distortion.

Whenturning the systemoff, the amplifier should

ALWAYSbe first. This avoidsthe possibility of a turn-

off transient fromsomeother componentgetting to the

speakers.

E PROTECTIONCIRCUITRY

Thereare no fuses in the KST-100.Theamplifier is

protectedbya series of non-intrusive,opto-c_o,upled

circuits that constantlyevaluatethe amplifiers operation.

Appropriateprotective action exists for DCconditions,

short circuit, oscillation, ACpoweranomalies,high

groundresistance and out-of:phase ground. Collectively

the protection circuitry is designedto avoiddamageto

the amplifier or speal~erscausedbyothe.r defective com-

ponents, faulty wiring, mishandlingof tlae systemor

amplifier failure. Whenthe protection circmt is engaged,

the a.mplifierwill shut off andshort its output. After

resolving either the input or output problemthe amplifier

can be turned on.

Theamplifier also has a circuit breakertype powe.r

switchthat protects it fromexcessive ACcurrentdraw.

Shouldthe breaker shut off frequently or becomedifficult

to pushONcontact yourdealer or Krell Industries.

G. MONAURALCONVERSION

AND OPERATION

TheKST-100can be easily cgnverted into a 400watt

monauralamplifier. Toswitcla the amplifier to mono

followthese instructions.

1. Removethe topcover fromthe amplifier via 8 topcover

screws.

2. Findthe toggleswitchlocated at the rear of the ampli-

fier mountedonthe circuitboard.. Mo.vethe toggle switch

overto the Monosetting printecl ontlae circuitboard.

3. Reinstall the topcoverand the 8 topcoverscrews.

OPERATION

1. Theinput of the KST-100in Monooperation is the

Left channelinput only.

Connectthe Left output of yourpreamplifier to the Left

channelinput of the ~lesignated left channelmonoampli-

tier. Connectthe rig~ht outputof yourpreamplifierto the

left channelinput ot the designatedright channelmono

amplifier.

2. Theoutput of the KST-100in Monooperation is the

positive outside bindingposts of eachchannel. Theinside

Blackbindingpost of eachchannelin monois not opera-

tional.

Connectthe left and right channelouter bindingposts on

eachamplifier to the loudspeaker.

NOTE:Paycareful attention to the labeling onthe.

backpanel of the KST-100whenmakinginput anti output

connections. Connectingthis amplifier i~or monaural

operation can becomeconfusing.

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