Krell Industries Stealth Stereo Preamplifie Users Manual

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A. INTRODUCTION
Thank you for your.purchase of the Krell STEALTH
AdvancedOne-Bit Digital to Analog Converter and
welcometo the Krell family of audio compo.n.ents. You
have joined a select groupof discriminating listeners who
enjoy the finest in musicreproduction.
Krell ,D, igital is dedicatedto the d~evelopment
of techno~1.o.gicady advancedcomponentstor the reproductio.n ot
digitally recorded music. These designs continue the
Krell tradition of uncompromisingperformancethrough
leading-edge technology.
To obtain the best performance from your STEALTH
processor, careful attention should be paid to its placement, installation and operation. A thoro~ughunderstanding of these details willhelp insure satistac.tory operation
ani:l long life for the STEALTH
and related system components.
This Owner’sReferenceis divided into several sections,
each designed to perform a different function. As you
.read throughthis. O.w,ner’s reference youwill become
19et.ter acquaintedwitla the features andfunctionstna.t
make the STEALTH
a superb value. A Question and
Answersection is also included where answers to commonquestions are provided. Should you have any questions or suggestionsplease feel free to contact your authorized dealer or the KRELL
staff for assistance.
In the unlikely event that your .STEALTH
should require
service, you will be pleasedto knowtlaat it is backedby_a
comprehensiveCustomerbatisfaction policy and one of
the mostadvancedservic, e facilities in the industry. For
cletailed informationon tlae terms and conditions of service please consult your warrantyregistration card or
your authorized KRELL
Distributor.

1

B. TABLE OF CONTENTS
3

UNPACKING INSTRUCTIONS

4

BASIC INSTALLATION AND OPERATION

5

INPUT AND ~UTPUT CONNECTIONS

7

PROCESSOR OPERATION AND DIGITAL
TAPE LOOP

9

QUESTIONS

AND ANSWERS

11

FRONT AND REAR PANEL DESCRIPTIONS

12

SPECIFICATIONS

14

WARRANTY AND SERVICE

2

INFORMATION

C, UNPACKINGINSTRUCTIONS

1. Openthe box and removethe top layer of foam. The
following items will nowbe visible:
STEALTHD/A Converter
AC power cord
PacKet containing the OwnersReference and
warranty card
NOTE:
If any of these items are not included please
contact your authorized dealer immediatelyf6r assistance.
2. Carefully removethe unit and accessories from the
box and removethe protective plastic wrapfrom the unit.
NOTE:
Saveall packingmater.ial.s. If you must ship y.our
STEALTH
in the future, re_packtlae unit in its original
packagingto prevent transit damage.
3. Remove
the voltage identification sticker on the back
of the unit.

D. BASIC INSTALLATION
AND OPERATION
Before you install the STEALTH
into your sy.stem we
recommend
that you follow these g.uidelines in choosing’
the location. This will facilitate a clean, trouble-free
installation.
CAUTION:
Whenmaking connections to this component
or any other, makesure tlie poweramplifier is OFFand
the preamplifier is in the MUTE
or STANDBY
mode.
1. Althoughwell shielded, the processor should not be
p.laced in close proximity to hum-sensitive components
~i.e. preamps,turntables, tuners, etc.)
2. As with any high quality, component,ensure that the
vent openingsin the chassis are ]~ree fromobstruction,
allowingthe processorto dissipate heat created by its
highly regulated powersupply and high bias Class A
output stage.
3. Place the unit on a clean, level surface awayfrom
excessive heat or moisture.
4. Connectthe ACpowercord to the back of the unit.
Oncethe powercord is secured, plug the other end into
an ACoutlet. The .O. degree, Source and Coax1 LEDs
will illuminate, indicating the digital signal processoris
powered.
S.hould y~ouru.nit not performas described above, unplug
tlae unit trom the ACoutlet and contact your local Krell
dealer or the Krell factory.
NOTE:While the STEALTH
has superb regulatio 9 and
does not require a dedicated ACcircuit, we strongly
advise, against any connectionsthrough extension cords
or multiple ACadaptors. High quality 15 ampgrounded
ACstrips are acceptable.
CAUTION:
Do not remove or bypass the ground pin on
the end of the ACcord. This maycause RFI (radio frequencyinterference) to be induced into your playback
system.

4

E. INPUT AND OUTPUT
CONNECTIONS
1. Connectthe Stealth analog output to the line level
input of your preamplifier.
The STEALTH
is equipped with two output configurations: Single-ended via RCAconnectors and Balanced
via XLRconnectors. If your pr.eamplifier has high lev~
balanced inputs we recommenclthe balanced outputs ot
t~.e processorb.e us.ed. Thereare considerablesonic benefits associatecl witt~ the use of this type of interconnection..H.igh quality tri-axial cable shouldbe usedfor balancecl interconnects. This type of cable is considerably
.different from cable normally used for single-ended
~nterconnects.
NOTE:The two outputs can be used to simultaneously
feed two different systems.
NOTE:If you decide to use the single-ended analog
outputs, the type of interconnect cable should be ctiosen
carefully. Highquality shield.ed cable is suggested.
The red bandedconnector inoicates the rigtit channel and
the white indicates the left channel.
Care should be taken to insure that the channel orientation betweenthe processor and the high level inputs of
your preamplifier are maintained.
2. Connect.the digital ou.tput of your CDtransport and
other digital sources to t~ae inputs of the STEALTH;
Coax
1, Coax2, Fibre Optic or XLR.If you are using multiple
digital sources, take note of whereeach input and correspondingswitch setting is located.
The STEALTH
is equipped with two coaxial digital
inputs, a stan~dardfibre optic digital input and a-balanced
digital input tor use with CompactDisc players, Laser
Disc players, DATsor satellite receivers. AnAT&T
wide
bandwidthfibre.optic input is also .available as a special
option. All of tlae inputs can accep~:.a signal fromany
digital source. When.apowereddigital sou.rce .is introduced,to an input anti tlaat input is selectecl witla the Input
switcla, the signal LEDwill ~uminate.

NOTE:If the digital source is ONand the signal LED
does not illuminate, checkto makesure the digital interconnectcable is secure at both ends or is not.in need of
repair.
NOTE:
Care should be taken in selecting the type of
cable usedto link the digital source to your processor. If
coaxial cable is to be..~used, it shouldbe non-capacitive
and have a bandwid~Snexcess of 10MHZ
to prevent
drop-outerrors.
NOT.E:If an optical cable is selected westrongly re,commenclthat it be a high quality Quartzfibre cabbie or the
optional AT&T
fibre optic cable. A benefit ot using an
optics interconnect is that it reducesthe groundloop
problemsoften associated with quality audio systems.
3. Connectthe digital output of the STEALTH
to the
i,n.put 9f a digita~l .recordingdevice.Thenconnecttlae.
oi~ital output ot tlae recorcler to the TAPE
input on tlae
STEALTH.
A digital Tape Record Output is provided via an. RCA_
co.n.nector. This output is usedto feed the digital input ot
a Oig.ital recordingdevice. TheTapeinput is provi.d.ed for
any_cligital source and can be usedas an additional input.
It shouldbe used for the output of a digital recording
device to avoid the possibility of creating a feedbacl~
loop.
4. Onceyou have completedthe necessary input and
output connections, seIect the input of your choice. For
each input selected, the correspondingLEDwill illuminate wfien the digital input source (must have its power
ON)and the processor have linked.

F. PROCESSOR OPERATION AND
DIGITAL TAPE LOOP
1. Select an input with.the Input switch. Notice the Signal
LEDwill illuminate whenthe digital source is turned on
and has linked with the processor. Oncethis link is complete the processoris ready to pass a signal.
2. Be sure that your preamplifier’s volumecontrol is
completely turned to the OFF(lowest volume)position.
3. Turn ONyour components, rememberingthat the last
componentto be energized should be your amplifier. The
amplifier should only-be turned ONafter all other components in the systemhave been on for at least two minutes. This will ~nsurethat there will not be any large
pulse created whenthe amplifier is turned on.
-4. Switchthe selector source of your preamp.tothee pgsi
tion correlating to your choseninput connectiontor the
STEALTH.
5. Youmaynowstart playing your digital source, DAT,
CDor satellite.
6. Slowlyturn the volumecontrol up to the lowest level
you can hear. Checkto see that both channels are worklng correctly before advancingthe volume.
NOTE:While your STEALTH
will perform beautifully
from the momentyou turn it on, it requires a minimum
warmup period of 8 hours before it will reach its full.
son!c potential. Discre.te components
are utilized in the
analog output stage and the warmup period allows them
to reach thermal equilibrium.
r installation is nowcomplete.Sho.uldyouhave any
fYuO~Uh
er questions
whichare not covered in the remainder
of this manual,contact your authorized Krell dealer. We
wish you manyhours of listening fulfillment.

7

STEALTH FEATURES
DIGITAL TAPE LOOP
TheTapeoutput is used as a direct digital output for a
digital recordingsystem. Thedigital source you wa.nt to
re.cord is selected by:the Input switch. To listen to the
clig~ital source select S:ourceon the Source/Monitor.
switch. To listen.to th6 Tapeoutput during or after the.
recording select Monitoron the Source/Monitorswitcla.
NOTE:The Tape input can also be used as an additional
source input.
CAUTION:
The Tape output is a dig!tal signal and can
not be used as an analog output to clrlve front end components such as a preampfifier.
PHASE SWITCH
The Phase Switch can reverse output phase. In some
studio recordings the master tape wasrecorded out of
phase, creating unusually poor sounding recordings..The
STEALTH
can reverse the normal 0 degree.output.plaase
180 degreesto correct for this anomaly.Utilizing tlae
PhaseSwitchcan, in someinstances, restore lif6 to a
previously dull soundingrecording.
EMPHASIS LED
Youwill notice that somediscs, or tracks within a disc,
activate the EmphasisLED.This signifies that the recorded material had emphasisfiltration used during the
recor.ding process. Emphasisis a recording industry
equalization network, similar to phonoRIAAequalization, intended for noise reduction.

8

G. QUESTIONS AND ANSWERS
Q. MyCDplayer has both fibre optic and coaxial
outputs. Whichone should I use?
A. Givena choice, we prefer the AT&T
optical link due
to its ability to completelyisolat,e the groundsbetween
the digital source componentanti the Processor. This
minimizesthe possibifity of groundloops in the digital
components. The optional AT&T
format also has the
added benefit of substantially higher bandwidththan
coax or the standard fibre optic interface..
Q. Will I damagemy STEALTH
if I leave the power
"ON"all the time?
A. No. The Class"A"discrete analog circuits perform
moreconsistently once they reach thermal equilibrium.
This processor has been designedto be left on at all , ,
times. The STEALTH
draws less than 25 watts out ot tlae
ACmains socket.
NOTE:For the protection of your processor we recommenddisconnecting the ACcord from the wall outlet
before any electrical storms or if you plan on being away
from homefor prolonged periods of time.
Q. Do I have to switch the SamplingFrequencywhenI
go between my CD and DAT?
A. No. Your STEALTH
automatically senses the input
frequency and does all necessary switching.
Q. I amnot ~etting an~vsoundthrough the processor.
What could oe wrong:
A. Mostlikely there has been a simple mistake in installation. Checkall connections IN and OUTfrom the
~erOCessor.
Checkallsource
power
Have
youthe
sected the correc,t
onconnections.
your preamp?
Check
front panel LEDs forpowersupply, stability. If you still
have no sound, turn off the power~nd contact your
dealer.

9

Q. I have somevery fine audiophile interconnect cable
whichhas superior sonic characteristics. CanI use this
¯
for mycoaxial digital input?
A. Youmayexperiment with any high quality cable. Do
note, that most audio interconnect cable is not designed"
to carry the ultra high frequencyinformationof the digital bit stream.
NOTE:For the STEALTH,we recommendnon-capacitive coaxial cable whichhas a bandwidthin excess of
10MHZ
and excellent shielding properties.
Q. While listening to mySTEALTH
I experience occasional periods of silence through myspeakers. Is my
processor malfunctioning?
A. Dropouts are caused by two primary reasons. First,
drop outs can be caused by Data corruption. Corrup.tion
in the data maybe due to a poor input connection, damaged or dirty source material, or interconnects whichd.o
not have a wide enoughbandwidth. The second item tlaat
causes the processorto reset is the presenceof a transient
spike on the incomingACpowerline. The processor is
resetting all of its digital processingcircuits so tlaat it can
be assured that all its circuits are properly synchronized.
Try changing your source material and check your connections. If these are not the cause, speak with your
dealer about obtaining different cabling. If you are using
fiber optics, and source material and connectionsare not
the problem, speak with your authorized dealer.
Q. Since I installed the processor in mysystemI have a
low level humthat increases as I turn up the volume.
There was no humin mysystem until I added the processor. Is the processor malfunctioning?
A. The fact that there wasno humin your syste~n until
you added the processor indicates that you have a
ground-loop problem. Often changing the interconnect to
a fibre optic cable will eliminate this problem.Theway
the digital processor and digital source are connectedto
the ACmains often can be t-he cause of groundingproblems. Lif~tingthe groundon a specific component~y
meansot a three prong to two prong ACadaptor(Cheater
plug) will often solve the probIem.Checkfor loose interconnect cables and or bad electrical connections. Consult
your dealer or Krell for individual systemsuggestions if
this humpersists.

10

H. FRONT AND REAR PANEL
DESCRIPTIONS
1. FRONTPANEL
a. Input Selection:
Coax 1
Coax 2
Optics
XLR

Coaxial input
Coaxial input
Standardfibre optic input
Balanceddigital-input or
(Optional)AT&T.
fibre optic input; shares
XLRinput switch setting

b. Source and Monitorselection:
Source
Monitor

Plays the selected input
Plays the source connectedto the Digital
Tape Input

c. AnalogBalancedOutput Phase selection:
0 degree In phase
180 degree Out of phase
2. REARPANEL
b. Digital Inputs:
Coaxial Input 1
Coaxial Input 2
Fibre Optic Input
Balanced Input .
AT&T
fibre optic (optional)
Digital Tape Input

To Coax 1
To Coax 2
To Optics
To XLR
To XLR
To Monitor

Input
Input
Input
Input
Input
Input

c. Digital Tapeoutput

Outputof selected Input

d. Processor AnalogOutputs:
Single-ended RCAoutputs
Balanced XLRoutputs

InpUt or Monitor

e. Balanced XLRoutput pin configuration
p!n 1
p.an2
pan 3

Ground(shield)
0 degrees (non-inverting)
180 degrees (inverting)

I.

SPECIFICATIONS

FREQUENCY RESPONSE
20Hz-20KHz +/- ldB
SAMPLING FREQUENCY
8 Times over sampling
DIGITAL
18 Bit

TO ANALOG CONVERTER

ANALOG OUTPUT VOLTAGE
2.1 volts R.M.S.
DIMENSIONS
19" Wide
12" Deep
2.375" High
WEIGHT
13 pounds, unit only
20 pounds, shipping weight

12

¯ 1. WARRANTY
AND SERVICE
INFORMATION
There are no user-serviceable parts inside the STEALTH:
The STEALTH
has a limited warranty of fiveyears parts
and labor on electronic parts including return freight. The
warranty,per!od, begins on ~the date of-purchaseand is
activatecl witla tlae retUrn ot the enclosedWarrantyCard
and a copy of the Sales receipt. Please return the completed warrantycard immediatelyafter successful installation and operation are completed.
Thewarrantyfor Krell products is valid only in th.e country to whichthey wereoriginally shipped.ard at tlae
fa.-ctory. If youthink there are problemsw.itla },our unit
please contact your dealer, distributor or tlae tactory
Immediately.
Please do not return any unit to KRELL
for repair without first calling to discuss the problemand to obtain a
Return Authorization number.~Freightto the factory or
distributor is your responsibility. Returnfreight to you
will be paid by the factory or distributor.
Anyunauthorized updates or modifications performed to
the unit will void the warranty.

14

I
0
I
0

DIGITAL
INC.

/

KRELL DIGITAL INC.
35 HIGGINS DRIVE MILFORDCT 06460
SALES203-874-3139 FAX203-878-8373
COPYRIGHT1991 KRELLDIGITAL INC.
(STEALTH9112)



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