Krell Industries Preamplifier KRC 2 Guida rapida

A. INTRODUCTION

Thankyou for your purchase of the KRELLKRC-2.

remote control preamplifier. TheKRC-2combinesthe

latest eV.olutionsin preamL~lifiertechnologywitha radical

approaclato remotecontrol circuitry. The-KRC-2is part

oI" a newgener.ation, of KRELLproducts whereconve-

nienceis unitedwitla exceptionalsonicquality.

Toobtain the best performance.fromyour KRC-2,carefu.1

attention sh.ouldbepaid to its placement,installation anti

operation. Athor~oughunderstandingof these detail.s will

helpinsure satistactory operationandlonglife for the

KRC-2and related system components.

This Owner’sReferenceis divided into several sections,

eac.h designedto perfor_,m

a different function. Asyou

read through the Owners Referenceyou will beco.me

bet.ter acquaintedwiththe features andfunctionsthat

makethe KRC-2a superb value, AQuestion and Answer

section is included wtiere answersto commonquestions

are provided. Shouldyouhave any questions or sugges-

tioffs pleasefeel free to contactyourauthorizeddeareror

the KRELLstaff for assistance.

In the unlikely event that your.KRC-2.shouldrequire

service, youwill bepleas6_dto ~lgaowtlaat it is backedbya

compretiensiveCustomerbatistaction policy and one of

the mostadvancedservice facilities in the industry. For

detailed informationon the termsand conditions of ser-

vice, please consult yourwarrantyregistration card, your

authorized KRELLDealer or Distributor.

B. TABLE OF CONTENTS

UNPACKING AND ASSEMBLY

BASIC INSTALLATIONAND OPERATION

INPUT AND OUTPUT CONNECTIONS

BASIC PREAMPLIFIER OPERATION

REMOTE CONTROL

QUESTIONS AND ANSWERS

SPECIFICATIONS

WARRANTYAND SERVICE INFORMATION

C. UNPACKING AND ASSEMBLY

1. Openthe boxand removethe top layer of foam. The

KRC-2and following items will nowbe visible:

KRC-2remote control

Warrantycard

ACpower cord

Owner’s Reference

NOTE:If any of these items are not included please

contact yourauthorized dealer immediatelyf6r assis-

tance.

3. Removethe plastic bag fromthe preamplifier and

remotecontrol.

NOTE:Saveall packingm.ate.rials. If you.mustship your

KRC-2in the future, repacl~the unit withtlae remote

control in its original packagingto preventtransit dam-

age.

D. BASIC INSTALLATION AND

OPERATION

1. Placethe unit on a firm level surface free fromexces-

sive dirt or moisture..TheKRC-2is not particularly hum

sensitive, therefore other componentscan be placedon or

around the KRC-2.

2. If youare using the separate. KPEph.onostage withthe

KRC-2,the following connections apply:

NOTE:If you are not using the KPEproceedto step 3.

a. Unplugthe KRC-2from the wall ACreceptacle.

b. Locate the 9 pin DCpowerconnector labeled KPE

POWER.

c. Connectthe KPEwith the DCpowercable supplie.d

with the phonostage, to the KPEPOWERinput on the

KRC-2.

d. Plugthe KRC-2into the wall AC.receptac.le..The Pilot

LEDon the KPEshould illuminate along with the

KRC-2.Theinput select will default to the mutepo.sition.

Shouldthe KPEpilot LEDnot illuminate, unplugthe

KRC-2fromthe wall ACreceptacle and checkaI1 qf your

connections. Shouldyouhave difficulty poweringtlae

KR.C-2and the KPEtogether please contact Krell for

assistance.

3. If you. are not usingthe .KPE,plugthe ACcordinto the

receptacle on the backof the umt. Plugthe remainingend

into the .wall ACreceptacle.Thepilot LEDwill illumi-

nate, and the KRC-2will default to the Muteposition.

NOTE:While the KRC-2has superb regulation and does

not require a dedicatedACcircuit, westrongly advise

against any. connectionsthroughextensioncords or mul-

tiple ACadaptors. Highquality 15 ampline conditioners

or groundedACstrips are acceptable.

NOTE:The KRC-2provides two special remote connec-

tors on the.backpane]. Theseare providedfor future room

remoteand remoteslave formats. Please consult the

KRELLstaff for assistance on these developments.

E. INPUT AND OUTPUT

CONNECTIONS

CAUTION:Whenmaking connections to this component

or any other, makesure tlie poweramplifier is OFF.

CAUTION:Makesure all cable terminations are of the

highest quality, free fromfrayed ends, shorts or cold

solder joints.

1. Connectt.he left and right outputs of your source com-

ponents t.o the inputs on the KRC-2.The KRC-2is

equipped with 4 single-ended inputs., 2 balanced capable

inputs, a single endedtape input and tape output.

The single-ended and balanced inputs are labeled S-1

througti S-4, B-1a.nd B-2 respectively, to allow

customization in the set-up otyour system. There is. no

difference betweenthe four single-ended inputs, or ~e-

tween the two balanced inputs.

2. Connectthe output of the KRC-2to the input of your

power amplifier. The KRC-2has both Balanced outputs

via standard XLRtype connectors and single-ended

outputs via standard-RCAtype connectors.

Thepin assignment for the XLRconnectors is:

pin _1-=shield (ground)

p!n 2 = non-inverting input (hot)

pin 3 - inverting input

NOTE:The RCAcenter conductor for each channel is

wired in para!lel with pin 2, the non-inverted output.

Onlyone of these outputs should be connected to a single

stereo amplifier.

NOTE:Whenconnecting inputs or outputs to the KRC,

rememberthe balanced connections will have 6dBof

gain .m.ore than the single-ended connections. Whenlevel

matchingis critical in yourinstall, keepthis specification

in mind.

REAR PANEL DESCRIPTION

INPUTS

Four single-ended inputs via standard RCAconnectors

Twobalanced inputs via standard XLRconnectors

TAPE

Tapeinput via standard RCAconnectors

TAPE OUTPUT

Record via RCAconnectors

MAIN OUTPUTS

Single-ended RCAoutput connectors

Balanced XLRoutput connectors

XLRinput and output pin configuration

p!n 1 Ground(shield)

p!n 2 0 degrees(non-inverting)

pin 3 180~egrees (inverting)

F. BASIC PREAMPLIFIER

OPERATION

TheKRC-2has the flexibility of a remotecontrolled

devicebut doesnot require special attention in orderto .

performsimple functions. Tile KRC-2will function much

fike other K/ell preamplifiers.Theunit can be operated

fromthe front panelcontrols or via the remotecontrol.

All functionsavailable onthe front panel can also be

accomplishedfrom the KRC-2remotecontrol. This gives

you.the ability to sit in yourfavorite listening position

andcontrol aI1 preamphfierfunctions.

Noteson the VolumeControl:

Thelevel control on the KRC-2is quite uniquein that.the

output level is indicated by illuminated LEDsaroundthe

ou~tsideof the level control, not bythe physicalpo.sition

ot the level co.ntr.ol. Whenyou~changelevel withthe

remotecontrol, the position ot the level control knob-

does not change. Whenyou increase the volumemanu-

ally or by remotecontrol, indicator LEDswill illuminate

clockwise. Whenyoudecrease the volume,indicator

LEDsilluminate counter clockwise. Whenthe level is

fully off, noindicatorLEDswill bei!lu .m.inated.Thisis

becauselevel is electrically regulatedwithout the use of

a potentiometer.

Thelevel indicator display for the KRC-2can be

switched betweena bar graph modeand a single LED.

.mode.In the bar graphmodeall LEDsare illuminated to

the point wherelevel is. set. In the single LEDmodeonly

one-LEDis illuminated at the level setting. Tochange

frombar graph modeto ~single LEDmode,pressanil

hold the MUTEbutton tor .approximately 3-seconds..

Level will nowbe indicated with a single LED.Holdthe

MUTEbutton in again for 3 secondsto changethe dis-

play back to the bar graph.mode.Thedisplay can only be

changedvia the front panel. "-

t~OTE:Whenchangingthe volume,display, do not select

e muteposition beforetrying to changethe display.

Wh.enyouare chang.ing the volumedisplay and holding

in the mutebutton, the muteLEDwill not illuminate.

Basic Operation:

1. Press the Mutebutton briefly on the KRC-2.

2. Turnthe volumecontrol fully counterclockwiseto the

Off position, no LED’silluminated.

3. Turnthe poweramplifier On.

4. Choosea listening sourceand.select that input by

pushing the correspondinginput button on the KRC-2.

5. Start playof the source.

turn6. Slowly _ the volumecontrol clockwise until you

reach a comtortablelistening level.

7. Whenchangingsources, return to the Mu.teposition

andor lowerthe volume.Thisinsures that tlae next

sourceyouplay will not be potentially damagingto your

systemwitti a highoutputtransient.

8. Enjoy

FRONT PANEL DESCRIPTION

INPUT SELECTION

S1 selects S 1 input

$2 selects $2 input

$3 selects $3 input

B1 selects B1 input

B2 selects B2input

FUNCTIONS

TAPE selects Tapei~nputandallows

monitoringot Tapereturn.

PHASE Inverts absolutepolarity of the main

output

LEDilluminates whenphase is

reversed 180 degrees when

GAIN

MUTE

BALANCE<

BALANCE >

VOLUME

Low6 dB High 12 dB

LEDilluminates in high position

Nosignal output whenLEDis On

Left channelattenuation in 1 dB

increments and OFF

Rightchannelattenuation in l dB

increments and OFF

Customelectronic volumecontrol

(Seenotes in section F)

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