Full Power Balanced Power Amplifiers Instructions for Use

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Full PowerBalanced
PowerAmplifiers
200c, 300c, 600c Stereo
250Mc, 350Mc, 650Mc Monaural
with Krell
CASTTechnology
Instructions for Use
Owner’s Reference
Full PowerBalanced
PowerAmplifiers
200c, 300c, 600c Stereo
250Mc, 350Mc, 650Mc Monaural
with Krell
CASTTechnology
v 00.0
Krell Industries,Inc.
45 Connair Road
Orange, CT 06477-3650 USA
TEL203-799-9954
FAX203-891-2028
E-MAILkrell @krellonline.com
WEBSITE
http://www.krellonline.com
This productcomplieswith the EMC
directive (89/336/EEC)
andthe low-voltagedirective (73/23/EEC).
WARNINGS
TheFull PowerBalanced
amplifier mustbe placedon a firm, level surfacewhereit is not exposed
to drippingor splashing.
Theventilation grids onthe top of the Full Power
Balanced
amplifier mustbe unobstructed
at all timesduring
operation.Donot placeflammable
material on top of or beneaththe component.
Beforemakingconnections
to the Full PowerBalanced
amplifier, ensurethat ff is off andthe preamplifier
is in muteor stand-bymode.Makesure all cable terminationsare of the highest quality and free from
frayedends,short circuits, or coldsolderjoints.
Thedifferential circuitry employed
with Full Power
Balanced
amplifiersrequiresspecialattentionwhenconnecting speakers.DOnot connectthe negativespeakerterminalstogether.Donot connectthe negativespeakerterminalsto groundor attemptto bridgethe left andright speaker
bindingpostsof Full Power
Balanced
stereoamplifiers.
Do not connect a Full PowerBalancedamplifier to a speakerselector device that employsa common
groundscheme,
as it mayshort-circuit the amplifier output.
THEREARE NO USERSERVICEABLE
PARTSINSIDE ANY KRELLPRODUCT.
PleasecontactyourauthorizedKrell dealer,distributor, or Krell if youhaveanyquestions
not addressed
in
this referencemanual.
This;~roduct
is manufactured
in theUnitedStatesof America.
Krell~is a registeredtrademark
of Krell Industries.Inc.. andis restrictedfor useby Krell IndusTM is a patentpending
tdes. Inc., its subsidiaries,andauthorized
agents.Sustained
PlateauBiasII is a patentof Krell Industries,Inc. Krell CAST
of Krell
TM,
TM,
TM
Industries,Inc. Krell CurrentMode Krell Link andKrell Playback
System are trademarks
of Krell Industries,Inc. All othertrademarks
are registered
to their respectivecompanies.
©2000
byKrell Industries,
Inc.All rightsreserved
P/N 303969
Contents
Page
INTRODUCTION
1
DEFINITION OF TERMS
1
REVOLUTIONARY KRELL CAST TECHNOLOGY
3
UNPACKING
4
PLACEMENT
AC Power Guidelines
4
5
FRONTPANEL DESCRIPTION
200c, 300c, and 600cStereo PowerAmplifiers
250Mc,350Mc,and 650McMonauralPowerAmplifiers
8
8
8
BACK PANEL DESCRIPTION
200c, 300c, and 600cStereo PowerAmplifiers
250Mc,350Mc,and 650McMonauralPowerAmplifiers
11
11
12
CONNECTINGTHE FULL POWERBALANCEDAMPLIFIER
TO YOUR SYSTEM
Input and Output Connections
Krell Link Connections
DCProtectionCircuitry
Usinga TubePreamplifier
13
,13
13
14
14
AMPLIFIER OPERATION
On/Off and Stand-byOperation
Krell Link Operation
15
15
15
REMOTECONTROLOPERATION
Howto TumOff the Amplifier LEDs
Howto Tumon the Amplifier LEDs
Howto Switch betweenKrell CASTand XLRInputs
Usinga DedicatedWall Outlet and Switch
16
16
16
16
16
AMPLIFIER TROUBLESHOOTING
Howto Troubleshoot SystemNoise
Howto EvaluateAmplifier Operation
17
17
17
QUESTIONS AND ANSWERS
19
WARRANTY
20
RETURNAUTHORIZATION PROCEDURE
21
SPECIFICATIONS
22
Krell Full Power
Balanced
Power
Amplifiers
iii
Illustrations
Page
FIGURE
1 Full PowerBalancedStereo Amplifier Front Panel
6
FIGURE
2 Full PowerBalancedMonaural Amplifier Front Panel
7
FIGURE
3 Full PowerBalanced Stereo Amplifier Back Panel
9
FIGURE4 Full PowerBalanced Monaural Amplifier Back Panel
iv
10
Krell Full Power
Balanced
Power
Amplifiers
Introduction
Definition of Terms
The Full PowerBalancedseries of amplifiers
consists of three stereo amplifiers, the Full
Power Balanced 200c, 300c, and 600c, and
three monauralamplifiers, the Full PowerBalanced250Mc,350Mc,and 650Mc.Installation,
connection,andoperationof all amplifiers in the
Full PowerBalancedseries are identical; however, a pair of Full PowerBalancedMonaural
amplifiers are required for stereo operation.
Following are the definitions of key terms used
in your owner’s reference manual.
Full PowerBalancedamplifiers can be configured to accommodate
any sophisticated music
or hometheater system and can be operated
by an optional remote control or through the
remotecontrol of other Krell components.
This owner’s reference manualcontains important information on placement,installation, and
operation of the Full PowerBalanced amplifiers. Pleaseread this information carefully. A
thorough understanding of these details will
help ensuresatisfactory operation and long life
for your Full Power Balanced amplifier and
related system components.
CONFIGURATIONS
Krell Link
A methodof synchronizing remotecontrol operation for Krell systemsthat includemultiple preamplifiers, amplifiers, and associated components. WhenKrell Link in/out connections are
used, the remotecapabilities of the linked components are controlled from one component,
called the control component.The linked components respond to stand-by and operational
mode commandsfrom the control component
via MIDI cables.
INPUT AND OUTPUTCONNECTIONS
Balanced
A symmetricalinput or output circuit that has
equal impedancefrom both input terminals to a
commonground reference point. The industry
standard for professional and soundrecording
installations, balanced connections have 6 dB
more gain than single-ended connections and
allow the use of long interconnect cables. Balanced connections are completely immuneto
induced noise from the systemor the environment.
Krell Current Audio Signal Transmission
(CAST)
A proprietary Krell circuit technologyfor connecting analog components,in which the audio
waveformis transmitted between components
in the current rather than voltage domain.The
speed and bandwidth provided by Krell CAST
yields accurate, realistic music reproduction.
Krell componentsconnected via CASTperform
as if theyare all part of a single circuit.
Krell Full Power
Balanced
Power
Amplifiers
1
Definition
of Terms,
co,,tinuo,
Single-ended
A two-wire input or output circuit. Usecare
whenusing single-ended connections as the
ground connection is madelast and broken
first. Turn the systemoff prior to makingor
breaking single-ended connections. Singleendedconnections are not recommended
for
connections
requiring long cableruns.
TECHNOLOGY
Krell CurrentMode
A proprietaryKrell circuit topologyin whichthe
audio gain stages of a component
operate in
the current rather than voltage domain.This
unique technology provides the component
with exceptionalspeedanda widebandwidth.
Krell Sustained
PlateauBiasII
AproprietaryKrell digital circuit that continually
monitorsthe input signal andoutputimpedance
Off
of a Krell amplifier andadjuststhe bias accordWhenthe powerswitch on the back panel is
placedin the downposition andthe blue power ingly to ensureClass A operation. Sustained
Plateau Bias II provides the enormous
sonic
LEDsturn off, the component
is off.
benefits of continuousClassA operationwhile
Operational Mode
minimizingthe heat generationandpowerconWhenthe powerbutton on the front panel is
sumptionnormally associated with Class A
pressedand the three blue powerLEDsillumidesigns.
nate, the component
is in the operationalmode
andreadyto play music.
OPERATION
Stand-by Mode
A low powerconsumption
status that keepsthe
audioandregulatorcircuits at idle. Krell recommendsleaving the component
in the stand-by
mode
whenit is not playing music.
2
Krell Full Powered
Balanced
PowerAmplifiers
Revolutionary Krell CAST
Technology
Current Audio Signal Transmission, termed
CAST,is a revolutionary methodof connecting
analog audio components for unparalleled
sonic performance. Innovative engineering
combines the new Krell CASTcircuitry with
existing Krell Current Modetechnologyto create entire CASTsystems that reproduce music
with incredible range, tonality, andprecision.
Voltage Signal Transmission
and the Traditional Audio System
Traditionally, signal is transmittedin the voltage
domain between two components. In an audio
system,eachcomponent
is a discrete entity with
uniquecharacteristics that act uponthe musical
signal independently. Each component is
unawareof the other components
in the system.
The cables that connect the componentseach
havetheir ownelectrical characteristics, which
affect the sonic presentationof the entire system.
CAST: A New Approach
CAST
circuitry recognizessignal transmitted in
the current domain instead of the voltage
domain between each component. CASTtransmission unifies the individual componentsand
their interconnects into an electrically linked
whole. Thesonic presentation of the entire system remainsintact.
CASTBasics
Here’s how a CASTaudio system works. Internally, eachCAST
sourcetransfers, or amplifies,
current using Krell CurrentModecircuitry. This
current signal is then output using CASTcircuitry. Whenthe signal is received by a CAST
input, Krell Current Modecircuitry again takes
over until the signal reachesthe loudspeaker.
By maintainingthe musicalsignal in the current
domainfrom beginning to end, an entire CAST
systembehavesas if it is one component.With
CAST,anomaliesof signal transmission between
Krell Full Power
Balanced
Power
Amplifiers
componentsare eliminated. Cable impedances
and their effects on the transmitted signal are
non-existent.
HowCASTand Krell Current ModeInteract
While CASTis a newmethodof transferring the
musical signal betweencomponents,its origin
stems from Krell Current Mode,the technology
developedto transfer the musical signal within
a component. CASTcombined with Krell Current Modetakes circuitry signal transmissionto
the next evolutionary level. In essence, Krell
Current Modemaintainsthe integrity of the signal within the componentand CASTpreserves
the transmitted signal between components.
Together, CASTand Krell Current Modetechnologies unify separate Krell components
into a
singleglobal circuit.
CASTCable Construction
A CASTsystem uses cables manufactured by
Krell and other manufacturers specially
licensed by Krell. Thin and flexible CASTcables
are constructed with the samebuild quality as
other Krell products and are aesthetically
matchedto the componentsthat Krell manufactures. An all-metal bodyand locking connectors
with gold contacts are part of the standardnocompromisespecification developedfor evenj
CASTcable made.
The Best Musical Performance
Whenyou operate a CASTsystem, you will
hear significant improvementsin every performancearea: speed, precision, dynamicrange,
depth and width of the soundstage, transient
impact, tonal balance, harmonicdistortion, and
more. The goal for CASTis the samecompany
goal usedfor all Krell products.Krell strives for
the delivery of the best performanceof a musical event for you, using the full expressionof
technologyto date.
3
Unpacking
Placement
Two people are needed to remove the Full
PowerBalancedamplifier from its shipping box
safely andeasily.
Before you install the Full Power Balanced
amplifier into your system, please follow the
guidelines in this section to chooseits proper
location. This will facilitate a clean, trouble-free
installation.
1. Openthe shipping box and removethe top
layer of foam. Yousee these items:
1 Full PowerBalancedAmplifier
1 Packet containing the owner’s
reference manualand the warranty
registration card
2. Orient the shipping box so that one person
stands at the front of the amplifier and one
personstands at the rear of the amplifier.
Both peopleneedto grab a pair of the cardboardhandlecutouts (onepair located at the
front of the amplifier andonepair located at
the rear of the amplifier) andsimultaneously
lift the amplifierstraight up, out of the carton.
3. Place the amplifier in a safe location and
removethe protective plastic wrapping.
Notes
ff any of the items mentioned above are not
included in the shipping box, please contact
your authorizedKrell dealer, distributor, or Krell
for assistance.
Saveall packingmaterials. If youship your Full
PowerBalancedamplifier in the future, repack
the unff in its original packaging
to preventtransit damage.See Return Authorization Procedure, on page21 for moreinformation.
The Full PowerBalancedamplifier requires at
least two inches (5 cm) of clearance on each
side and at least eight inches (20 cm) of clearance above the component to provide adequate ventilation.
Although Sustained Plateau Bias II circuitry
reducesthe high heat dissipation and heat output of traditional Class A circuitry, Full Power
Balancedamplifiers still can becomehot under
normal operation.
Whenthe front and rear of a cabinet are open
the air space betweenthe chassis an~l shelf
mustbe unobstructed. If you place the amplifier in a closed cabinet, you mayneed to modify
shelf spacingor use small fans to increase ventilation. For the dimensionsof your Full Power
Balanced amplifier, see Specifications, on
pages 22-23.
Place the amplifier as close to the speakersas
possible. Krell CASTtechnology permits you to
use interconnect cables of any length, see Flevolutionary
CAST Technology on page 3;
however,try to keepthe cable length to a minimum.
All Full PowerBalancedamplifiers drive the
lowest impedances with ease. Whenimpedance is added due to long speaker cable
lengths, amplifier poweris wastedin the cable.
Long speaker cables reduce the maximum
powerthat is delivered in the speakers.
4
Krell Full Power
Balanced
Power
Amplifiers
Placement,
continued
AC POWERGUIDELINES
The Full Power Balanced 200c and 250Mc
amplifiers need to be operated from a dedicated AC power line rated at a minimumof 15
amps. The Full Power Balanced 300c, 350Mc,
600c, and 650Mcamplifiers need to be operat-
Krell Full Power
Balanced
Power
Amplifiers
ed from a dedicated ACpower line rated at a
minimumof 20 amps.
Pleasecontact your authorizedKrell dealer, distributor, or Krell before using any devices
designedto alter or stabilize the ACpowerfor
Full PowerBalancedamplifiers.
5
FIGURE 1
FULL
P(
IWER BALANCED STEREO AMPLIFIER
123
1 Power Stand-by LED
2 Bias LED
3 Power Button
6
FR()NT
PANEL
456
4 Infrared Sensor
5 Krell CASTLED
6 Regulator LED
Krell Full Powered
Balanced
PowerAmplifiers
FIGURE 2
FULL POWER BALANCED MONAURAL AMPLIFIER
789
7 PowerStand.by LED
8 Bias LED
9 PowerButton
Krell Full Powered
Balanced
Power
Amplifiers
FR( INT
PANEL
10 11 12
10 Infrared Sensor
11 Krell CASTLED
12 RegulatorLED
7
Front Panel Description
The front panel accesses power on/stand-by
and infrared sensor (remote control) functions.
Thepowerstand-by, bias, regulator, and Krell
CASTLEDs,arrangedin a triangle on the front
panel abovethe powerbutton, illuminate to indicateamplifier status.
FULL POWERBALANCED200c,
300c, AND 600c STEREOPOWER
AMPLIFIERS
See Figure 1 on page6
1 Power Stand-by LED
The blue power stand-by LED(top of LEDtriangle) illuminates whenthe back panel power
breaker switch has been movedto on, engaging the input circuitry and placing the amplifier
in stand-by mode.
2 Bias LED
Theblue bias LED(lower left of triangle) illuminates after the front panel power button is
pressed, indicating that the SustainedPlateau
Bias II is engaged.
3 Power Button
Use the silver power button, to power on the
amplifier from stand-by mode.
4 Infrared Sensor
The infrared sensor receives the signal from a
remotecontrol.
5 Krell CASTLED
Thered Krell CAST
LED(center of triangle) illuminates when a Krell CASTinput on the back
panel is connectedto another Krell product with
a Kreil CASToutput.
6 Regulator LED
Theblue regulator LED(lower right of triangle)
illuminates after the front panel powerbutton is
used to power on from stand-by mode,indicating that the regulator is providing powerto the
output stage.
8
Note
An optional remotecontrol is available for Full
PowerBalancedamplifiers.
FULL POWERBALANCED250Mc,
350Mc, AND 650Mc MONAURAL
POWERAMPLIFIERS
SeeFigure2 on page7
7 Power Stand-by LED
The blue powerstand-by LIED (top of LEDtriangle) illuminates whenthe back panel power
breaker switch has been movedto on, engaging the input circuitry andplacing the amplifier
in stand-by mode.
8 Bias LED
Theblue bias LED(lower left of triangle) illuminates after the front panel power button is
pressed, indicating that the SustainedPlateau
Bias II is engaged.
9 Power Button
Use the silver power button to power on the
amplifier from stand-by mode.
10 Infrared Sensor
Theinfrared sensor receives the signal from a
remotecontrol.
11 Krell CASTLED
Thered Krell CAST
LED(center of triangle) illuminates whena Krell CASTinput on the back
panel is connectedto anotherKrell productwith
a Krell CASToutput.
12 Regulator LED
Theblue regulator LED(lower right of triangle)
illuminates after the front panel powerbutton is
used to poweron from stand-by mode,indicating that the regulator is providing powerto the
output stage.
Krell Full Power
Balanced
Power
Amplifiers
FIGURE
3 FULL
19 13
POWER BALANCED STEREO AMPLIFIER
14 15 16 17
13 Left andRight SpeakerBindingPosts
Inputs
14 Krell CAST
15 BackPanel PowerBreaker Switch
Krell Full Powered
Balanced
Power
Amplifiers
18 16
14
BACK PANEL
13 19
16 Left andRight Balanced
Inputs
17 Krell LinkOut/In
18 AC Mains PowerCord
19 Handles
FIGURE 4
FULL POWER BALANCED MONAURAL AMPLIFIER
20 21
20 Handle
21 SpeakerBinding Posts
Input
22 Krell CAST
23 BalancedInput
10
22
23 24
BACK PANEL
25 26
24 ACMains PowerCord
25 Krell LinkOut/In
26 Back Panel Power
BreakerSwitch
Krell Full Powered
Balanced
Power
Amplifiers
BackPanel Description
The back panel provides connections for all
inputs and outputs, poweron/oft, and remote
control links. Theback panel also has handles
that allow you to safely and easily movethe
amplifier.
FULL POWERBALANCED200c,
300c, AND 600c STEREOPOWER
AMPLIFIERS
SeeFigure 3 on page9
13 Left and Right SpeakerBinding Posts
Full Power Balanced 200c, 300c, and 600c
stereo amplifiers are equippedwith four pairs of
speakerbinding posts (upper left, lower left,
u pperright, andlowerright).
Notes
Twopairs of speakerbinding posts are usedfor
eachchannelof amplification. Onthe stereo or
monaural Full Power Balanced amplifiers,
either the upper or the lower pair can be used
with speakershaving two pairs of binding posts.
For biwiring applications, with speakershaving
morethan one pair of binding posts, use both
upper and lower pairs of speakerbinding posts.
See the speaker’s instruction
manual for
biwiring connections.
Speakerbinding posts for stereo and monaural
amplifiers accept spadelugs only. Bare wire,
bananalugs, or pins will not work. Usethe red
terminal for the positive connection and the
blue terminal for the negative connection.
14 Krell CASTInputs
Full Power Balanced 200c, 300c, and 600c
stereo amplifiers are equippedwith oneleft Krell
CASTinput andone right Krell CAST
input via 4pin bayonet connectors. The Krell CASTinputs
allow the Full PowerBalancedamplifier to be
connectedto the KPS25sc Krell PlaybackSystem and other CAST-equippedcomponents.
Krell Full Power
Balanced
Power
Amplifiers
15 Back Panel Power Breaker Switch
Full Power Balanced amplifiers are equipped
with a back panel power breaker switch, for
powering on the amplifier. Placing the back
panel power breaker switch in the up position
places the amplifier in stand-by mode,whereit
remainsuntil the front panelpowerbutton (3)
pressed.
Note
Krell recommends
that the amplifier remain on,
in stand-by mode, even whennot in use, once
it is powered on from the back panel power
breaker switch (15).
16 Left and Right BalancedInputs
Full Power Balanced 200c, 300c, and 600c
stereo amplifiers are equippedwith oneleft balancedinput and one. right balancedin pr~t via
XLRconnectors.
17 Krell Link Out/In
Full PowerBalanced amplifiers are equipped
with Krell Link Remoteout/in connectors that
allow the remote control to operate a linked
amplifier configuration. See Krell Link Connections, on page13 for moreinformation.
Note
An optional remotecontrol is available for Full
PowerBalancedamplifiers.
18 AC Mains Power Cord
All Full PowerBalancedamplifiers are equipped
with a permanentlyattached ACpowercord.
19 Handles
All Full PowerBalancedstereo amplifiers are
equippedwith two handles, located beside the
speaker binding posts, to help you easily and
safely movethe amplifier.
11
BackPanelDescription,
continued
FULL POWERBALANCED250Mc,
350Mc, AND 650Mc MONAURAL
POWER,AMPLIFIERS
24 AC Mains Power Cord
All Full PowerBalancedamplifiers are equipped
with a permanently attached ACpowercord.
SeeFigure 4 on page10
25 Krell Link Out/In
Full PowerBalanced amplifiers are equipped
with Krell Link Remoteout/in connectors that
allow the remote control to operate a linked
amplifier configuration. See Krell Link Connections, on page13 for moreinformation.
20 Handle
All Full PowerBalancedmonauralamplifiers are
equipped with a handle, located beside the
speaker binding posts, to help you easily and
safely movethe amplifier.
21 Speaker Binding Posts
Full Power Balanced 250Mc, 350Mc, and
650Mcmonaural amplifiers are equipped with
two pairs of speaker binding posts (one upper
pair and one lower pair). For stereo operation,
two monauralamplifiers are required.
22 Krell CASTInput
Full Power Balanced 250Mc, 350Mc, and
650Mcmonauralamplifiers are equipped with
one Krell CASTinput via a 4-pin bayonet connector. The Krell CASTinput allows the Full
PowerBalanced amplifier to be connectedto
the KPS25sc Krell Playback Systemand other
CAST-equippedcomponents.
23 Balanced Input
Full PowerBalanced 250Mc,350Mc,and 650Mc
monauralamplifiers are equippedwith one balancedinput via an XLRconnector.
12
Note
An optional remotecontrol is available for Furl
PowerBalancedamplifiers.
26 Back Panel Power Breaker Switch
Full PowerBalanced amplifiers are equipped
with a back panel power breaker switch, for
powenngon the amplifier. Powering on u§ing
the back panel powerbreaker switch places the
amplifier in stand-by mode, where it remains
until the front panel powerbutton is pressed.
Note
Krell recommends
that, once the amplifier is
powered on from the back pane/power breaker
switch, it remains on, in stand-by mode,even
whennot in use.
Krell Full Power
Balanced
Power
Amplifiers
Connectingthe Full PowerBalanced
Amplifier to YourSystem
INPUT AND OUTPUT
CONNECTIONS
4. Insert the endof the ACmainspowercord
into the ACwall receptacle.
5. Proceedwith Krell Link Connections,if
desired,or turn to Amplifier Operation,on
page15.
Krell recommends
using its proprietary Krell
CAST
systemfor unparalleled sonic performancebetween the Full Power Balanced
amplifiers and other CAST-equipped
components and the KPS25sc Krell PlaybackSys- KRELL LINK CONNECTIONS
tem.
Krell Link Remoteout/in connectors on the
backpanel of the Full PowerBalancedamplifiFull PowerBalanced
amplifiers also offer balancedoperation.Thecircuitry andconnections er allow you to synchronize remote control
associated with balancedoperation not only operation for systemsthat include multiple
amplifiers and associated components.When
can minimizesonic loss but also are immune
to
induced
noise,especiallyfor installations using the Krell Link Remoteout/in connectorsare
used,the remotecapabilities of the linked comlongcables.
ponentsare controlled from one amplifier or
A one piece RCA-to-XLR
adapteris available
preamplifier, called the control component.
The
fromKrell Industries,to allowsingle-ended
oper- linked componentsrespond to stand-by and
ation usingthe balanced
XLRinputs.
operational modecommands
from the control
via MIDI cables.
Thefollowing steps describe howto connect component
cablesto the Full Power
Balanced
Amplifiers.
Note
1. Neatly arrangeandorganizewiring to and Kre// Link usesstandardfive pin M/D/commureferred to as M/D/
fromthe amplifier andall components.
Sep- nication cab/es, sometimes
P/us
cab/es.
M/D/
cab/es
can be purchased
arate ACwiresfromaudiocablesto prevent
humor other unwantednoise from being from your authorizeddistributor or dea/er, or
froman audiosupp/ystore.
introducedinto the system.
2. Connectthe Krell CASTcables from your How to Connect Components
CAST-enabled
preamplifier/source compo- throughKrell Link
nent to the left andright Krell CAST
4-pin
off, using the back
bayonetinputson the amplifier backpanel. 1. Turn all components
panel powerbreaker switch. This ensures
For balancedoperation, connectthe interthat
the components
are synchronizedwhen
connectcablefromyour preamplifierto the
the MIDIcableis connected.
left and right balancedXLRinput on the
amplifier backpanel.
2. Select the component
to be the control component.
The
control
component
mustbe in
3. Connectthe speakercables to the Full
plain viewfor properremotecontrol operaPowerBalanced
amplifier’s speakerbinding
tion.
posts, locatedon the amplifier backpanel.
Speakerbindingposts for both stereo and 3. Connectone end of the MIDI cable to the
monaural
amplifiers acceptspadelugs only.
Krell Link out connectoron the backpanelof
the component.
KrellFull Power
Balanced
Power
Amplifiers
13
Connecting,
continued
4. Connectthe other end of the MIDI cable to
the Krell Link in connectoron the next component.
USING A TUBE PREAMPLIFIER
The high DCoutput of tube preamplifiers may
exceed the DCprotection circuitry of Full
To link another corn ponent, connecta secPower Balanced amplifiers.
Excessive DC
ond MIDI cable to the Krell Link out conlevel in a signal can damage
amplifiers, speaknector on the back panel of the second
ers, or both. The coupling capacitors in Full
component. Connect the remaining end of
Power Balanced amplifiers must be engaged
the MIDI cable to the Krell Link in connec- whenusing a tube preamplifier. An authorized
tor on the back panel of a third component.
Krell dealer, distributor, or Krell mustactivate
5. Link additional components,if desired, as these capacitors.
describedin Steps3 and 4.
Coupling capacitors must be inserted into the
Thecomponents
are nowready for operation with
signal path by your authorizedKrell dealer, disKrell Link.
tributor, or Krell before you can use your Full
PowerBalancedamplifier with a tube preampliDC PROTECTIONCIRCUITRY
fier.
Full PowerBalancedamplifiers use unobtrusive
IMPORTANT
direct current (DC) protection circuitry that
Please read the Warranty, on page 20, to
strips DCfrom the signal without corrupting
understand the warranty limitations of Full
sound reproduction. Full Power Balanced
Power Balanced amplifiers when used with
amplifiers feature direct coupledcircuitry from
tube preamplifiers.
input to output. This topologyeliminatesall coupling capacitors from the audio signal path.
Coupling capacitors block damaging DC but
have sonic characteristics that corrupt sound
reproduction.
Note
For moreinformation about DCprotection circuitry features, see Amplifier Troubleshooting,
on page 17.
14
Krell Full Power
Balanced
Power
Amplifiers
Amplifier Operation
Full PowerBalanced amplifiers are easy to
install andoperate. However,it is importantto
exercise care during operation, due to the
amplifiers’ enormouspoweroutput. Switching
betweenactive sources (such as a CDplayer,
tape monitor, or VCR)without muting the preamplifier output, or bumpingor miscuing a
sourcecangeneratelarge transients at low frequencies. Full PowerBalancedamplifiers may
generate enoughpower with these transients
to damageloudspeakers.
IMPORTANT
Alwaysmuteor fully attenuate the preamplifier
level whenswitching sources.
Donot changeinput connectionsto the amplifier whenthe amplifier is on.
Use care whensetting high playback levels.
Becauseof their tremendousreserves of clean
power,Full PowerBalancedamplifiers can safely drive speakersto higher soundpressurelevels than other amplifiers. Alwayslower the volumelevel at the first sign of speakerdistress.
ON/OFFANDSTAND-BYOPERATION
Whenpowering on any system, turn on amplifiers last. Turnoff amplifiersfirst.
1. Movethe back panel powerbreaker switch
to the up position to engagethe input circuitry andplacethe amplifier into the standby mode.Thefront panel blue powerstandby LEDilluminates.
2.
Pressthe silver powerbutton on the amplifier front panel. Theblue regulatorLEDilluminates. Oncethe regulator provides powerto
the output stage, the blue bias LEDilluminates. TheSustainedPlateauBias II system
is nowengaged.
After the protectioncircuitry
hasconfirmedthat safe operatingconditions
exist, the input relays engage.Youhear a
click. Theamplifier is readyfor operation.
Krell Full Power
Balanced
Power
Amplifiers
If the Krell CASTinput is being used, the
Krell CAST red LED illuminates
and
remainsilluminated at all times during the
stand-by or power on modes.
3. With the preamplifier mutedor volumecontrol completely lowered, select a source.
Increase the volumecontrol to the desired
listeninglevel.
4. Whenturning off the system, mute or completely lower the preamplifier volume, or
place the Full PowerBalancedamplifier in
the stand-by power modeby pressing the
powerbutton on the front panel. It is now
safe to turn off the rest of the system.
Note
For best performanceof Full PowerBalanced
amplifiers, leave the backpanel powerbr~eaker
switch on at all times.
KRELLLINK OPERATION
1. Whenall components are linked, place
each componentin the stand-by modeby
moving the back panel power breaker
switch to the up position. This ensuresthat
all componentswill be synchronized when
signals from the control component
are sent
to the linked components
in the system.
2. Whenthe components are in stand-by,
switch the control componentto the operational modefrom the control component’s
front panel or by using the component’s
remotecontrol.
Thelinked corn ponentsswitch to the operational modesimultaneously.
A linked componentcan be switched between
the operational modeand stand-by, individually, from its front panel. Switchinga linked component temporarily breaks the chain of linked
components.To re-establish linked operation,
return all components
to stand-by.
15
RemoteControl
Operation
Full PowerBalancedamplifiers are compatible
with the remotecontrols includedwith Krell preamplifiers, the Krell Audio + Video Standard,
the KAV-300r RemoteControl Receiver, the
HomeTheater Standard, and the KPS 25sc
Krell Playback System.
Pleasecontact your authorizedKrell dealer, distributor, or Krell to purchase
a remotecontrol for
Full PowerBalancedamplifiers.
Full PowerBalancedamplifiers can be located
in a roomor spaceclose to the speakersbut out
of sight, and poweredon or off remotely from
the listening room,througha control amplifier.
See Krell Link Connections, on page 13.
HOWTO TURN OFF
THE AMPLIFIER LEDs
The amplifier must be in the stand-by mode
with the rear panel power breaker switch on.
While holding the silver powerbutton in, press
the powerkey on the remotecontrol. After the
amplifier finishes its turn-on sequence,
the front
panel blue LEDsturn off. The blue LEDsremain
off throughout normal operation as long as the
amplifier’s rear panel powerbreaker switch is
not turnedoff.
HOWTO TURN ON
THE AMPLIFIER LEDs
With the amplifier in the stand-by mode,turn
the rear panel powerbreaker switch to the off
position. Thenturn the rear panel powerbreaker switch back to the on position. Thenext time
the amplifier is poweredup from the front panel
or the remotecontrol, the blue LEDsilluminates
during the turn-on sequence.
HOW TO SWITCH BETWEEN
KRELL CAST AND XLR INPUTS
Press the meter key on a Krell remoteto switch
between CASTinputs and the balanced XLR
inputs.
Full PowerBalancedamplifiers default to CA~ST
operationuponstartup, if the amplifier is tumed
off from the rear panel powerbreaker switch and
a CASTsource and cable are connected to the
CASTinputs. The operational modedoes not
changeif the Full PowerBalancedamplifier is in
stand-by mode.
USING A DEDICATEDWALL
OUTLET AND SWITCH
Full PowerBalancedamplifiers can be powered
on from an ACwall receptacle with a dedicated
switch, rather than from the front panel power
button or optional remotecontrol.
Pleasecontact your authorizedKrell dealer, distributor, or Krell for moreinformation beforeyou
connectyour Full PowerBalancedamplifier to a
dedicatedACwall outlet with a switch.
16
Krel Full Power
Balancec~
Power
Amplifiers
Amplifier Troubleshooting
HOW TO TROUBLESHOOT
SYSTEM NOISE
AC grounding becomescritical
when connecting high performance audio components. When
you mix and match audio components, each
with its ownground potential, a low frequency
hummayoccur in one or both speakers. This
often occurs when introducing a new component into a system.
If a low frequency hum emanates from the
speakers whenyou place the Full Power Balancedamplifier into the system, follow these
simple troubleshooting steps:
Note
During these steps, the back panel power
breaker switch remainsin the on position.
1. Check all input and output connections,
makingsure they are of soundconstruction.
With the amplifier in stand-by mode,remove
the interconnect cables, then press the front
panel powerbutton. If the humdisappears,
press the powerbutton to return to stand-by
mode,and reinsert one of the interconnect
cables. Press the powerbutton again. If the
humreappears with one or both interconnects inserted, there maybe a defective
cable. Havethe interconnect cables checked
before proceeding.
2.
HOWTO EVALUATEAMPLIFIER
OPERATION
Theamplifiers are protected by a series of nonintrusive circuits that constantly evaluate the
amplifier’s operation. This circuitry protects
against damagingDCinput or output and short
circuits, see also DCProtection Circuitry, on
page 14, and monitors regulator operation,
ensuring constant voltage to the output stage.
The protection circuitry in a Full PowerBalancedamplifier is designedto prevent damage
to the amplifiers or speakers causedby other
defective components,faulty wiring, system
mishandling,or amplifier failure.
In addition, whena Full PowerBalancedamplifier’s DCprotection circuitry sensesa problem
within the system,it identifies, then indicatesthe
problem by illuminating the front panel blue
LEDs,as describedin the following table.
Notes
TheKrell CASTLEDilluminates only ff a Krell
CASTinput is being used.
There are no output fuses in Full PowerBalancedamplifiers.
If the interconnect cables are sound, you
maybe experiencing a ground loop. This
can often be easily eliminated. Please contact your authorizedKrell dealer, distributor,
or Krell for suggestionson howto solve this
problem.
Krell Full Power
Balanced
Power
Amplifiers
17
If the courseof action listed in the table belowdoesnot correct the situation, please contact yourauthorizedKrell dealer, distributor, or Krelh
AMPLIFIER CONDITION
The output mutes during
playback and the following
LEDsilluminate: Power
Stand-by, and
Regulator Bias
POSSIBLE CAUSES
Excessive DCat the
amplifier input
The amplifier switches to
stand-by modeand the
Power Stand-by LED
illuminates
Electrical short in speaker
cables or inside speaker
The amplifier switches to
stand-by at high volumes
and the Power Stand-by
LEDilluminates
Insufficient ACcurrent from
the wall outlet
If preamplifieris a tube
model, see Using a Tube
Preamplifier, on page14.
Excessive heat
The amplifier powers down
completely and no LEDs
illuminate
18
COURSEOF ACTION
Havesource unit and
preamplifier checkedfor high
DCoutput
Checkall speakercables for
any cuts or frayed edgesthat
might form a connection
betweenthe positive and negative speakerbinding post terminals
Makesure the ACline is at
least 15 amps for 200cand
250Mcamplifiers; 300c,
350Mc, 600c, and 650Mc
amplifiers shouldbe
operated from a dedicated
20-amp line.
DCpresent at the output
stage
Allowamplifier to cool before
resumingoperation. See
Placement,on page4 for ventilation requirements
Contactyour authorized Krell
dealer,distributor, or Krell
Internal amplifier problem
Contactyour authorized Krell
dealer,distributor, or Krell
Krell Full Power
Balanced
Power
Amplifiers
Questions and Answers
Q. Should I leave my Full Power Balanced
amplifier on at all times?
A. For maximum
amplifier performance, leave
the back panel powerbreaker switch on at all
times. This places the amplifier in stand-by
mode. Full Power Balanced amplifiers are
designed to be poweredon and off from standby, using the front panel powerbutton. This
eliminates "cold start" degradations.Theamplifier will operateat full performance
within minutes.
Q. When
I turn on the amplifier there is a loud
humthrough the speakers. Whatshould I do?
A. Whena newcomponentis introduced, a low
frequency hummayoccur in one or both speakers. Checkall input and output connectionsand
cables, making sure they are of sound construction. See Howto Troubleshoot System
Noise, on page 17. If the interconnects and
cables are sound, you maybe experiencing a
groundloop. This can often be easily eliminated. Pleasecontact your authorizedKrell dealer,
distributor, or Krell for suggestionson howto
solve this problem.
Q. Mysystemincludes multiple pairs of speakers. CanI connect them to my Full PowerBalanced amplifiers through a speaker selector
box?
A. No. Most speaker selector boxes use a commongroundscheme.Thedifferential circuitry in
Full PowerBalancedamplifiers prohibits the use
of these devices. Do not connecta Full Power
Balanced amplifier to a speaker selector
Krell Full Power
Balanced
Power
Amplifiers
device that employs a commonground
scheme,as it mayshort-circuit the amplifier
output.
Q, My speakers have only one pair of binding
posts, but my Full Power Balanced stereo
amplifier has two pairs. Whichpair of speaker
binding posts should I use, the upper or the
lower?
A. The upper and lower pair of speaker binding posts on Full PowerBalancedstereo amplifiers are identical. Youcan useeither the upper
or lower pair; they work and sound the same.
See Connecting the Full Power Balanced
Amplifier to YourSystem,on page 13.
Q. My speakers are rated for 150 Watts. Are
the Full PowerBalanced300 or 600 modelstoo
powerful for them?
A. No. A speaker seldom is damaged from
overdriving. More often, damageoccurs when
an amplifier that lacks sufficient poweris asked
to handle heavy demandsituations such as
high playback levels. These amplifiers may
have very high 8 Ohmpower ratings, but in
heavy demandsituations they can be driven
into clipping (in which DCcurrent goes to
speakersdue to loss of amplifier power). Clipping can damagespeakers. Avoid damageto
your speakers by reviewing your speaker’s
specifications and exercise caution in heavy
demandsituations.
19
Warranty
ThisKrell producthasa limited warrantyof five yearsfor
partsandlaboroncircuitry. Should
this productfail to performat anytimeduringthe warranty,Krell will repair it at
nocost to the owner,
exceptas set forth in this warranty.
Thewarrantydoesnot applyto damage
causedby acts of
Godor nature.
Thewarrantyonthis pageshall bein lieu of anyotherwarranty, expressed
or implied,including,but not limited to,
anyimpliedwarranty
of merchantability
or fitnessfor a particular purpose.Thereare no warrantieswhichexceed
beyondthosedescribedin this document.
If this product
doesnot performas warrantedherein, the owner’ssole
remedy
shall berepair. In noeventwill Krell beliable for
incidental or consequentialdamages
arising from purchase,use,or inability to usethis product,evenif Krell has
beenadvisedof the possibility of suchdamages.
IMPORTANT
Theuseris responsible
for notifyinghis or her Krell dealer, distributor,or Krell that a tubepreamplifier
will beused
with the Full Power
Balanced
amplifier, so that the Krell
dealer,distributor, or Krell canactivatethe coupling
capacitors. If theuserdoesnotnotifytheKrelldealer,distributor,
or Krell andusesa tube preamplifier without the Full
PowerBalancedamplifier’s couplingcapacitor engaged,
Krell reservesthe right to refusewarrantyrelatedservice
due to DC-relateddamage.
Proofof purchase
in theformof a bill of sale or receipted
invoicesubstantiatingthat the unit is within the warranty
periodmustbe presentedto obtainwarrantyservice. The
warrantybeginsonthe date of retail purchase,as noted
onthe salesslip providedby anauthorizedKrell dealeror
distributor.
Thewarranty
for Krell products
is valid onlyin thecountryto
whichtheywereoriginally shipped,throughthe authorized
Krell distributorfor that country,andat the factory.There
maybe restrictions on or changesto Krell’s warranty
because
of regulationswithin a specific country. Please
checkwith yourdistributor for a complete
understanding
of
thewarrantyin yourcountry.
If a unit is servicedbya distributorwhodid notimportthe
unit, theremaybea chargefor service,evenif the product
is withinthewarranty
period.
20
Freightto the factoryis yourresponsibility.Returnfreight
within the UnitedStates(U.S.A.)is includedin thewarranty.
If youhavepurchased
yourKrell productoutsidethe U.S.A.
andwishto haveit servicedat the factory, all freight and
associatedchargesto the factory are your responsibility.
Krell will payreturnfreight to the U.S.A.-based
freight forwarderof yourchoice.Freightandothercharges
to ship the
unit fromthe freight forwarderto youare also yourresponsibility.
Krell is not responsible
for anydamage
incurredin transit.
Krell will file claimsfor damages
as necessary
for units damagedin transit to thefactory.Youare responsible
for filing
claimsfor shippingdamages
duringthe return shipment.
Krell doesnot supplyreplacement
parts and/orproductsto
the ownerof the unit. Replacement
parts and/orproducts
will befurnished
onlyto thedistributorperforming
serviceon
this unit onan exchange
basis only; anyparts and/orproducts returnedto Krell for exchange
become
the propertyof
Krell.
Noexpressedor implied warrantyis madefor anyKrell
product damaged
by accident, abuse,m~suse,natural or
personaldisaster, or unauthorized
modification.
Anyunauthorizedvoltage conversion,disassembly,
componentreplacement, perforation of chassis,
updates,or modificationsperformed
to the unit will
void the warranty.
Theoperatingvoltageof this unit is determined
by the factory andcanonly bechanged
by an authorized
Krell distributor or at the factory. Thevoltagefor this productin the
U.S.A.cannotbe changed
until six months
fromthe original
purchase
date.
In the eventthat Krell receivesa productfor warrantyservice that hasbeenmodifiedin anywaywithoutKrell authorization,all warranties
onthat productwill bevoid.Theproduct will bereturnedto original factorylayoutspecifications
at the owner’sexpense
beforeit is repaired.All repairs
requiredafter the producthasbeenreturnedto original factory specificationswill be charged
to the customer,
at current partsandlaborrates.
All operationalfeatures,functions,andspecificationsand
policiesare subjectto change
withoutnotification.
To register your productfor warrantybenefits,
please completeand return the Warranty Registration Card enclosed in the shipping box
within 15 days of purchase. Thankyou.
Krell Full PowerBalancedPowerAmplifiers
ReturnAuthorization
Procedure
If you believe there is a problemwith your component,pleasecontact your dealer, distributor, or
the Krell factory to discuss the problembefore
you retum the component
for repair. To expedite
service, you maywish to complete and e-mail
the Service RequestFormin the Service Section
of our websiteat:
www.krellonline.com
Tocontactthe Krell ServiceDe}artment
TEL
FAX
E-MAIL
203-799-9954
Monday-Friday
9:00 AMto 5:00 PMEST
203-799-9796
service@
krellonline.com
WEBSITE www.krellonline.com
Full PowerBalanced
Amplifier
PRODUCTNAME
MODELNUMBER
SERIAL NUMBER
To return this productto Krell, please follow
this procedure so that we may serve you
better:
1. Obtain a Return Authorization Number(R/A
number) and shipping address from the
Krell Service Department.
2.
Insure andacceptall liability for loss of or
damageto this product during shipment to
the Krell factory and prepay all shipping
charges. Please see the Warranty page in
this manual,concerningliability for shipping
damageand shipping charges.
This product mayalso be hand delivered if
arrangements with the Service Department
have been madein advance. Proof of purchase
maybe required for warranty validation at the
time of handdelivery.
IMPORTANT
Usethe original packagingto ensure safe transit of this productto the dealer, distributor, or
factory. Krell may,at its discretion, return this
product in newpackagingand bill the ownerfor
such packagingif the product received by Krell
was boxedin non-standardpackagingor if the
original packagingwas so damaged
that it was
unusable.If Krell determinesthat newpackaging is required, the ownerwill be notified before
this productis returned.
To purchaseadditional packaging, please contact your authorizedKrell dealer, distributor, or
the Krell Service Department.
Krell Full Power
Balanced
Power
Amplifiers
21
Specifications
Full PowerBalanced200c, 300c, 600c Stereo Amplifiers
FPB 200c
FPB 300c
FPB 600c
20 Hz to 20 kHz
+0 dB, -0.05 dB
20 Hz to 20 kHz
+0 dB, -0.05 dB
20 Hz to 20 kHz
+0 dB, -0.05 dB
0.1 Hz to 240 kHz
+0 dB, -3 dB
0.1 Hz to 240 kHz
+0 dB, -3 dB
0.1 Hz to 240 kHz
+0 dB, -3 dB
SIGNAL TO NOISE RATIO
"A" WEIGHTED
113 dB
117 dB
120 dB
GAIN
26.4 dB
26.4 dB
26.4 dB
TOTAL HARMONIC
1 kHz <0.02%
DISTORTION (THD)
20 kHz <0.15%
ALL BALANCED, UNWEIGHTED
1 kHz <0.02%
20 kHz <0.15%
1 kHz <0.02%
20 kHz <0.15%
INPUT IMPEDANCE
100 kOhms
100 kOhms
100kOhms
INPUT SENSITI VITY
1.92 Vrms
2.35 Vrms
3.39 Vrms
OUTPUT POWER
EACH CHANNELDRIVEN
8 Ohms 200 W
4 Ohms 400 W
2 Ohms 800 W
8 Ohms 300 W
4 Ohms 600 W
2 Ohms1,200 W
8 Ohms 600W
4 Ohms1,200 W2 Ohms2,400 W
OUTPUT VOLTAGE
Peakto Peak138 V
RMS
49 V
Peakto Peak170 V
RMS
60 V
Peakto Peak240 V
RMS
84 V
POWER CONSUMPTION
Stand-by
60 W
Idle
175 W
Max.
1,700 W
Stand-by
75 W
Idle
350 W
Max.
3,000 W
Stand-by
85 W
Idle
430 W
Max.
6,000 W
INPUTS
1 pair balancedvia
XLRconnectors
1 pair CAST
Via 4-pin
bayonet connectors
1 pair balancedvia
XLRconnectors
1 pair CAST
via 4-oin
bayonetconnectors
1 pair balancedvia
XLRconnectors
1 pair CAST
via 4-pin
bayonetconnectors
OUTPUTS
SPEAKERBINDING POSTS
4 pair (upperleft,
lowerleft, upperright
lowerright)
4 pair (upperleft,
lowerleft, upperright
lowerright)
4 pair (upperleft
lowerleft, upperright
lowerright)
REMOTE CONTROL
Optional
Optional
Optional
DIMENSIONS
INCHES
CENTIMETERS
19.0w x 10.3h x 17.0d
48.3wx 26.2h x 43.2d
19.0wx 10.3h x 19.7d
48.3wx 26.2h x 50.0d
19.0wx 10.3hx25.5d
48.3wx26.2hx 64.8d
WEIGHT
SHIPPING
UNIT ONLY
107.0lb., 48.6 kg
90.0 lb., 40.9 kg
127.0lb., 57.7kg
110.0lb., 50.0 kg
200.0b., 90.9 kg
180.0lb., 81.8 kg
FREQUENCY RESPONSE
All operationalfeatures,functions,specifications,andpolicies are subject to change
without notification.
22
Krell Full PowerBalanced
Power
Amplifiers
Specifications
Full PowerBalanced250Mc, 350Mc, 650McMonauralAmplifiers
FPB 250Mc
FPB 350Mc
FPB 650Mc
20 Hz to 20 kHz
+0 dB, -0.05 dB
20 Hz to 20 kHz
+0 dB, -0.05 dB
20 Hz to 20 kHz
+0 dB, -0.05 dB
0.1 Hz to 240 kHz
+0 dB, -3 dB
0.1 Hz to 240 kHz
+0 dB, -3 dB
0.1 Hz to 240 kHz
+0 dB, -3 dB
SIGNAL TO NOISE RATIO
"A" WEIGHTED
114 dB
118 dB
121 dB
GAIN
26.4 dB
26.4 dB
26.4 dB
TOTAL HARMONIC
1 kHz <0.03%
DISTORTION (THD)
20 kHz <0.03%
ALL BALANCED, UNWEIGHTED
1 kHz <0.03%
20 kHz <0.03%
1 kHz <0.03%
20 kHz <0.03%
INPUT IMPEDANCE
100 kOhms
100 kOhms
100 kOhms
INPUT SENSITIVITY
2,14 Vrms
2.6 Vrms
3.39 Vrms
OUTPUT POWER
EACH CHANNELDRIVEN
8Ohms 250W
4Ohms 500W
2 Ohms1,000 W
8Ohms 350W
4Ohms 700W
2 Ohms1,400 W
8Ohms 650W
4Ohms 1,300W
2 Ohms2,600 W
OUTPUT VOLTAGE
Peakto Peak138 V
RMS
49 V
Peakto Peak170 V
RMS
60 V
Peakto Peak240V
RMS
84 V
POWER CONSUMPTION
Stand-by
30 W
Idle
150 W
Max.
1,700 W
Stand-by 37.5 W
Idle
175 W
Max.
3,000 W
Stand-by 42.5 W
Idle
220 W
Max.
6,000 W
INPUTS
1 balancedvia
XLRconnectors
1 Krell CAST
via 4-pin
bayonet connectors
1 balancedvia
XLRconnectors
1 Krell CAST
via 4-pin
bayonet connectors
1 balancedvia
XLRconnectors
1 Krell CAST
via 4 p~n
bayonetconnectors
OUTPUTS
SPEAKERBINDING POSTS
2 pair (one upper,
one lower)
2 pair (oneupper,
one lower)
2 pair (oneupper,
one lower)
REMOTE CONTROL
Optional
Optional
Optional
DIMENSIONS
INCHES
CENTIMETERS
12.5w x 10.5h x 16.0d
31.8w x 26.7h x 40.6d
12.5wx 10.5h x 19.0d
31.8wx 26.7h x 48.3d
12.5wx 10.5hx 25.0d
31.8wx 26.7hx 67.3d
WEIGHT
S HIPPING
UNIT ONLY
79.0 lb., 35.9kg
68.0 lb., 31.0kg
110.0lb., 50.0kg
98.0lb., 44.5 kg
155.0lb., 70.5 kg
140.0lb., 63.6kg
FREQUENCY RESPONSE
Krell Full PowerBalancedPowerAmplifiers
23
Krell Industries,Inc.
45 Connair Road
Orange, CT 06477-3650 USA
TEL 203-799-9954
FAX 203-891-2028
E-MAIL
krell @krellonline.com
WEB
SITE http://www.krellonline.com
Full PowerBalanced
PowerAmplifiers
200c, 300c, 600c Stereo
250Mc, 350Mc, 650Mc Monaural
with Krell
CASTTechnology
v 00.0