Krell Industries Stealth Stereo Preamplifie User's Manual
Contents
1. OWNER S REFERENCE A INTRODUCTION Thank you for your purchase of the Krell STEALTH Advanced One Bit Digital to Analog Converter and welcome to the Krell family of audio components You have joined a select group of discriminating listeners who enjoy the finest in music reproduction Krell Digital 1s dedicated to the development of techno logicaily advanced components for the reproduction of digitally recorded music These designs continue the Krell tradition of uncompromising performance through leading edge technology To obtain the best performance from your STEALTH processor careful attention should be paid to its place ment installation and operation A thorough understand ing of these details will help insure satisfactory operation and long life for the STEALTH and related system com ponents This Owner s Reference is divided into several sections each designed to perform a different function As you read through this Owner s reference you will become better acquainted with the features and functions that make the STEALTH a superb value A Question and Answer section is also included where answers to com mon questions are provided Should you have any ques tions or suggestions please feel free to contact your au thorized dealer or the KRELL staff for assistance In the unlikely event that your STEALTH should require service you will be pleased to know that it is backed by a comprehensive Customer Sat2. You will notice that some discs or tracks within a disc activate the Emphasis LED This signifies that the re corded material had emphasis filtration used during the recording process Emphasis is a recording equalization network similar to phono RIAA equaliza tion intended for noise reduction mmm IOO I HdAVL IVLIDIG HOSSHJOid Gw G QUESTIONS AND ANSWERS Q Mv CD er has both fibre optic and coaxial outputs Which one should I use A Given a choice we prefer the AT amp T optical link due to its ability to completely isolate the grounds between the digital source and the Processor This minimizes the possibilitv of in the digital components The optional AT amp T format also has the added benefit of substantially higher bandwidth than coax or the standard fibre optic interface Q Will I damage my STEALTH if I leave the power ON all the time A No The Class A discrete analog circuits perform more consistently once they reach thermal equilibrium This processor has been designed to be left on at all times The STEALTH draws less than 25 watts out of the AC mains socket NOTE For the protection of your processor we recom mend disconnecting the AC cord from the wall outlet before any electrical storms or if you plan on being away from home for prolonged periods of time Q Do I have to switch the Sampling Frequency when I go between my CD and DAT A No Your STEALTH automa
3. NNECTIONS 1 Connect the Stealth analog output to the line level input of your preamplifier The STEALTH is equipped with two output configura tions Single ended via RCA connectors and Balanced via XLR connectors If your preamplifier has high level balanced inputs we recommend the balanced outputs of the processor be used There are considerable sonic ben efits associated with the use of this du of interconnec tion High quality tri axial cable should be used for bal anced interconnects This ty e of cable is considerably different from cable normally used for single ended interconnects 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 chosen carefully High quality shielded cable is suggested The red banded connector indicates the right channel and the white indicates the left channel Care should be taken to insure that the channel orienta tion between the processor and the high level inputs of your preamplifier are maintained 2 Connect the digital output of your CD transport and other digital sources to the inputs of the STEALTH Coax 1 Coax 2 Fibre Optic or XLR If you are using multiple digital sources take note of where each input and corre sponding switch setting is located The STEALIH is i with two coaxial digital inputs a standard fibre optic digital input and a balanced di
4. Sales receipt Please return the com pem warranty card immediately after successful instal ation and operation are completed The warranty for Krell products is valid only in the coun try to which they were originally shipped and at the factory If you think there are problems with your unit please contact your dealer distributor or the factory immediately Please do not return any unit to KRELL for repair with out first calling to discuss the problem and to obtain a Return Authorization number Freight to the factory or distributor 15 your responsibility Return freight to you will be paid by the factory or distributor Any unauthorized updates or modifications performed to the unit will void the warranty 14 m DIAS ALNVANVAM mmm 0 0 I 0 lt n DIGITAL INC El KRELL DIGITAL INC 35 HIGGINS DRIVE MILFORD CT 06460 SALES 203 874 3139 FAX 203 878 8373 COPYRIGHT 1991 KRELL DIGITAL INC STEALTH9112
5. TH will perform beautifully from the moment jat turn it on it requires a minimum warm up period of 8 hours before it will reach its full sonic potential Discrete components are utilized in the analog output stage and the warm up period allows them to reach thermal equilibrium Your installation is now complete Should you have any further questions which are not covered in the remainder of this manual contact ne authorized Krell dealer We wish you many hours ot listening fulfillment STEALTH FEATURES DIGITAL TAPE LOOP The Tape output is used as a direct digital output for a digital recording svstem The digital source vou want to record is selected bv the Input switch To listen to the digital source select Source on the Source Monitor switch To listen to the Tape output during or after the recording select Monitor on the Source Monitor switch NOTE The Tape input can also be used as an additional source input CAUTION The Tape output is a signal and not be used as an analog output to drive front end compo nents such as a preamplifier PHASE SWITCH The Phase Switch can reverse output phase In some studio recordings the master tape was recorded out of A creating unusuallv poor sounding recordings The TEALTH can reverse the normal 0 degree output phase 180 degrees to correct for this anomalv Utilizing the Phase Switch can in some instances restore life to a previously dull sounding recording EMPHASIS LED
6. e The processor is resetting all of its digital processing circuits so that it can be assured that all its circuits are synchronized Try changing your source material and check your con nections If these are not the cause speak with your dealer about obtaining different cabling If you are using fiber optics and source material and connections are not the problem speak with your authorized dealer Q Since I installed the processor in my system I have a low level hum that increases as I turn up the volume There was no hum in my system until I added the proces sor Is the processor malfunctioning A The fact that there was no hum in your system 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 The way the digital processor and digital source are connected to the AC mains often can be the cause of grounding prob lems ground on a specific component b means of a three prong to two prong AC adaptor Cheater plug will often solve the problem Check for loose inter connect cables and or bad electrical connections Consult vour dealer or Krell for individual svstem suggestions if this hum persists 10 H FRONT AND REAR PANEL DESCRIPTIONS I FRONT PANEL a Input Selection Coax 1 Coaxial input Coax 2 Coaxial input ti Standard fibre optic input XLR Balanced digital input or Optional AT a
7. gital input for use with Compact Disc plavers Laser Disc players DATs or satellite receivers An AT amp T wide bandwidth fibre optic input is also available as a special option All of the inputs can accept a signal from any digital source When a digital source is intro duced to an input and that input is selected with the Input switch the signal LED will illuminate NOTE II the digital source is ON and the signal LED does not illuminate check to make sure the digital inter connect cable is secure at both ends or is not in need of repair NOTE Care should be taken in selecting the type of cable used to link the digital source to your processor If coaxial cable is to be used it should be non capacitive and have a bandwidth in excess of IOMHZ to prevent drop out errors optical cable is selected we mend that it a high qualitv Quartz fibre cable or the optional AT amp T fibre optic cable A benefit of using an optics interconnect is that it reduces the ground loop problems often associated with quality audio systems 3 Connect the digital output of the STEALTH to the input of a digital recording device Then connect the EUR Lo of the recorder to the TAPE input on the STEALTH A digital E Record Output is provided via an RCA connector This A 1s used to feed the digital of a digital recording device The input is provided for any digital source and can be used as an additional in
8. isfaction policy and one of the most advanced service facilities in the industry For detailed information on the terms and conditions of ser vice please consult your warranty registration card or your authorized KRELL Distributor B TABLE OF CONTENTS A 11 12 14 UNPACKING INSTRUCTIONS BASIC INSTALLATION AND OPERATION INPUT AND OUTPUT CONNECTIONS PROCESSOR OPERATION AND DIGITAL TAPE LOOP QUESTIONS AND ANSWERS FRONT AND REAR PANEL DESCRIPTIONS SPECIFICATIONS WARRANTY AND SERVICE INFORMATION NOILLOQnGONLNI mmm C UNPACKING INSTRUCTIONS 1 Open the box and remove the top laver of foam The following items will now be visible 1 STEALTH D A Converter 1 AC power cord 1 Packet containing the Owners Reference and warrantv card NOTE If any of these items are not included please contact your authorized dealer immediately for assis tance 2 Carefully remove the unit and accessories from the box and remove the protective plastic wrap from the unit NOTE Save all packing materials If you must ship your STEALTH in the future repack the unit in its original packaging to 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 ke svstem we recommend that vou follow these guidelines in choosing the location This will facilitate a clean troubie free installatio
9. mp T fibre optic input shares XLR input switch setting b Source and Monitor selection Source Plays the selected input Monitor Plavs the source connected to the Digital Tape Input c Analog Balanced Output Phase selection O degree In phase 180 degree Out of phase 2 REAR PANEL b Digital Inputs Coaxial Input 1 To Coax 1 Input Coaxial Input 2 To Coax 2 Input Fibre Optic Input To Optics Input Balanced Input To XLR Input AT amp T fibre optic optional To XLR Input Digital Tape Input To Monitor Input c Digital Tape output Output of selected Input d Processor Analog Outputs Single ended RCA outputs Input or Monitor Balanced XLR outputs e Balanced XLR output pin configuration pin 1 Ground shield 2 U degrees non inverting pin 3 180 degrees inverting 11 I SPECIFICATIONS FREQUENCY RESPONSE 20Hz 20KHz 1dB SAMPLING FREQUENCY 8 Times over samp Ing A TO ANALOG CONVERTER it ANALOG OUTPUT VOLTAGE 2 1 volts R M S DIMENSIONS 19 Wide 12 Dee 2375 High WEIGHT 13 pounds unit only 20 pounds shipping weight 12 SNOILVOMIDAAS ww J WARRANTY AND SERVICE INFORMATION There are no user serviceable parts inside the STEALTH The STEALTH has a limited warranty of five parts and labor on electronic parts including return freight The warrantv period begins on the date of purchase and 15 activated with the return of the enclosed Warrantv Card and a of the
10. n gt CAUTION When making connections to this component or anv other make sure the po amplifier is OFF and the preamplifier is in the MUTE or STANDBY mode 1 Although well shielded the processor should not be laced in close proximity to hum sensitive components preamps turntables tuners etc 2 As with anv high qualitv component ensure that the vent openings in the chassis are free from obstruction allowing the processor to dissipate heat created by its highly regulated power supply and high bias Class A output stage 3 Place the unit on a clean level surface awav from excessive heat or moisture 4 Connect the AC power cord to the back of the unit Once the power cord is secured plug the other end into an AC outlet The O degree Source and Coax 1 LEDs will illuminate indicating the digital signal processor 1s powered Should your unit not perform as described above unplug the unit from the AC outlet and contact your local Krell dealer or the Krell factory NOTE While the STEALTH has superb regulation and does not require a dedicated AC circuit we strongly advise against i connections through extension cords or multiple AC adaptors High quality 15 amp grounded AC strips are acceptable CAUTION Do not remove or bypass the ground pin on the end of the AC cord This may cause RFI radio fre quency interference to be induced into your playback system gt _ _ E INPUT AND OUTPUT CO
11. put It should be used for the output of a digital recordin device to avoid the possibility of creating a feedbac loop 4 Once you have completed the necessary input and output connections select the input of your choice For each input selected the corresponding LED will illumi nate when 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 LED will illuminate when the digital source is turned on and has linked with the processor Once this link is com plete the processor is readv to pass a signal 2 Be sure that your preamplifier s volume control is completely turned to the OFF lowest volume position 3 Turn ON your components remembering that the last component to be energized should be your amplifier The amplifier should only be turned ON after all other com ponents in the system have been on for at least two min utes This will insure that there will not be any large pulse created when the amplifier is turned on 4 Switch the selector source of your preamp to the posi tion correlating to your chosen input connection for the STEALTH 5 You may now start playing your digital source DAT CD or satellite 6 Slowly turn the volume control up to the lowest level ou can hear Check to see that both channels are work ing correctly before advancing the volume NOTE While your STEAL
12. tically senses the Input frequency and does all necessary switching 0 I am not getting any sound through the processor What could be wron A Most likelv there has been a simple mistake in instal lation Check all connections IN and OUT from the PME Check all power connections Have you se ected the correct source on your E Check the front panel LED s for power supply stability If you still no sound turn off the power and contact vour ealer Q I have some very fine audiophile interconnect cable which has superior sonic characteristics Can I use this for my coaxial digital input A Xou experiment with high qualitv cable Do note that most audio interconnect cable is not designed to carrv the ultra high frequencv information of the digi tal bit stream TE NOTE For the STEALTH we recommend non capaci tive coaxial cable which has a bandwidth in excess of 10MHZ and excellent shielding properties Q While listening to my STEALTH I experience occa sional periods of silence through my speakers Is my processor malfunctioning A Drop outs are caused by LV0 primary reasons First outs can be caused by Data corruption Corruption in the data may be due to a poor input connection dam aged or dirty source material or interconnects which do not have a wide enough bandwidth The second item that causes the processor to reset is the presence of a transient spike on the incoming AC power lin
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