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.
2
B. TABLE OF CONTENTS
4
5
6
8
10
11
14
15
UNPACKING AND ASSEMBLY
BASIC INSTALLATIONAND OPERATION
INPUT AND OUTPUT CONNECTIONS
BASIC PREAMPLIFIER OPERATION
REMOTE CONTROL
QUESTIONS AND ANSWERS
SPECIFICATIONS
WARRANTYAND SERVICE INFORMATION
3
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.
4
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.
6
REAR PANEL DESCRIPTION
INPUTS
Four single-ended inputs via standard RCAconnectors
S1
$2
$3
$4
Twobalanced inputs via standard XLRconnectors
B1
B2
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)
7
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.
8
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
9
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)
10
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