Krell Industries Digital to Analog Processor STUDIO 2 User's Manual
Contents
1. press the 180 DEG button To change back to normal phase press the 0 DEG button Utilizing the Phase Switching can in some instances restore life to a previously dull sounding recording EMPHASIS LED Emphasis is a recording technique that accentuates the treble region of recorded music Discs and or Tracks that were recorded with Pre emphasis will cause the Emphasis LED to illuminate When the Emphasis LED is lit the appropriate complementary circuitry De emphasis is activated to provide a flat output response PAGE 12 OPERATION OPERATING INSTRUCTIONS 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 complete the Processor is ready to pass a signal 2 Be sure that your preamplifier volume control is turned completely to the OFF lowest volume position 3 Turn ON your components remembering that the last compo nent to be energized should be your amplifier The amplifier should only be turned ON after all other components in the system have been on for at least two minutes This will insure that no large pulse will be created when the amplifier is turned on 4 Switch the source selector of your preamp to the position correlating to your chosen input connection for the STUDIO 2 5 You may now start playing your digital source DAT CD or satellite 6 Slowly turn the volume control up to2. te STUDIO 2 STUDIO 2 DIGITAL TO ANALOG PROCESSOR OWNER S REFERENCE INTRODUCTION Thank you for your purchase of the Krell STUDIO 2 Digital to Analog Processor and welcome to the Krell family of audio components Krell is dedicated to the development of technologi cally advanced components for the reproduction of digitally recorded music The STUDIO 2 continues the Krell tradition of uncompromising performance through leading edge technology To obtain the best performance from your STUDIO 2 Processor careful attention should be paid to its placement installation and operation A thorough understanding of these details will help insure satisfactory operation and long life for the STUDIO 2 and related system components a This Owner s Reference is divided into several sections which describe the features and functions of the STUDIO 2 A Question and Answer section is included to provide answers to common questions Should you have any questions or suggestions please feel free to contact your authorized dealer or the KRELL staff for assistance In the unlikely event that your STUDIO 2 should require service you will be pleased to know that it is backed by a comprehensive Customer Satisfaction policy and one of the most advanced service facilities in the industry For detailed information on the terms and conditions of service please consult the Warranty and Service section of this Reference Warranty Registration
3. Card or authorized KRELL Dealer Distributor PAGE 2 il 13 15 18 19 TABLE OF CONTENTS RE OES EO ET NY PE TE anama a daka EER TREE GE TEE ELE ER E TER Br ER sn EDE mes kaanan See ER dhah NT AZ ZTL UNPACKING INSTRUCTIONS PLACEMENT AC POWER CONSIDERATIONS INPUT AND OUTPUT CONNECTIONS PROCESSOR OPERATION OPERATING INSTRUCTIONS QUESTIONS AND ANSWERS SPECIFICATIONS WARRANTY AND SERVICE INFORMATION mee PAGES _ __ UNPACKING INSTRUCTIONS 1 Open the box and remove the top layer of foam The following items will now be visible 1 STUDIO 2 D A Processor 1 AC power cord 1 Packet containing the Owner s Reference and Warranty Card NOTE If any of these items are not included please contact your authorized dealer immediately for assistance 2 Carefully remove the STUDIO 2 from the box Remove the protective plastic wrap from the Processor NOTE Save all packing materials If you must ship your STUDIO 2 in the future repack the unit in its original packaging to prevent transit damage PAGE 4 PLACEMENT PLACEMENT Before you install the STUDIO 2 into your system we recommend that you follow these guidelines in choosing the location This will facilitate a clean trouble free installation 1 Although well shielded the STUDIO 2 should not be placed in close proximity to hum sensitive components i e preamps turntables tuners etc that can create interference an
4. digital sources to the inputs of the STUDIO 2 If you are using multiple digital sources take note of where each input and corresponding switch setting is located The STUDIO 2 is equipped with the following inputs two coaxial one AT amp T wide bandwidth fiber optic standard TOSH fiber optic and one AES EBU All inputs can accept a signal from any digital source such as Compact Disc players Laser Disc players DATs or satellite receivers When a powered digital source is introduced to an input and that input is selected with the specific Input switch the corresponding signal LED will illuminate When the source and the Processor have locked the SYNC indicator LED will illuminate The STUDIO 2 has a provision to add an additional AT amp T input The second AT amp T input will replace the Coax 2 space on the back panel and is selected by the COAX2 ST input switch For further information contact KRELL NOTE If the digital source is ON and the signal LED does not illuminate check to make sure the digital interconnect cable is secure at both ends or is not in need of repair PAGE 8 CONNECTIONS 5 Once you have completed the necessary input and output connections select the input of your choice For each input selected the corresponding LED will illuminate When a powered digital input source and the Processor have linked the SYNC LED will illuminate DIGITAL SOURCE TO D A PROCESSOR INTERLINK CONSID ERATIONS Care
5. the digital Processor and digital source are connected to the AC mains often can be the cause of grounding problems Check for loose interconnect cables and or bad electrical connections Consult your dealer or Krell for individual system suggestions if this hum persists PAGE 17 SPECIFICATIONS FREQUENCY RESPONSE 3 dB 20KHz and at 8Hz SIGNAL TO NOISE gt 115dB DIGITAL TO ANALOG CONVERTER 18 bit PROCESSING 1 Motorola DSP 56001 Upgradable software contained in socketed EPROM LINEARITY 3dB at 90dB THD N 0025 92dB CHANNEL SEPARATION 2 109dB ANALOG OUTPUT VOLTAGE 2 00 volts DIMENSIONS 19 00 WIDE 12 50 DEEP 2 50 TALL with feet SHIPPING WEIGHT 16 pounds PAGE 18 WARRANTY AND SERVICE WARRANTY AND SERVICE INFORMATION There are no user serviceable parts inside the STUDIO 2 The STUDIO 2 has a limited warranty of five years parts and labor Return freight is included in the warranty The warranty period begins on the date of purchase and is activated with the return of the enclosed Warranty Card and a copy of the Sales receipt Please return the Warranty Card immediately after successful installation and operation are completed The warranty for Krell products is valid only in the country 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 The operating volt
6. the fiber optic cable e Slide the cable connector into the AT amp T receptacle with the key sliding into the designated slot f Gently push the connector into place depressing the internal spring and twist the outer collar clockwise to secure the con nection PAGE 10 OPERATION INPUT SELECT SWITCHING The STUDIO 2 has multiple digital inputs Each input has its own input switch and direct path to the digital Processor When an input is selected the corresponding LED will illuminate AT amp T AT amp T fiber optic input TOSH Toshiba fiber optic input XLR Balanced AES EBU digital input COAX Coaxial input COAX 2 ST Coaxial input or Optional 2nd AT amp T ST input SYNC INDICATOR When the input signal locks with the Processor the SYNC LED will illuminate The input frequency is automatically selected by the Processor As an example if you select the AT amp T input from a CD transport the 44 1 KHz frequency will automatically be selected and the SYNC LED will illuminate The STUDIO 2 will accept and automatically adjust to 38 0 KHz 44 1 KHz and 48 0 KHz input frequency signals PAGE 11 OPERATION O and 180 PHASE SWITCHING The absolute output phase of the STUDIO 2 can be changed In some recordings the master tape was recorded out of phase creating unusually poor sounding recordings The STUDIO 2 can shift the absolute output phase 180 to correct for this anomaly To change the phase from 0 to 180
7. The Class A discrete analog circuits perform more consis tently once they reach thermal equilibrium This Processor has been designed to be left On at all times The STUDIO 2 draws less than 30 watts out of the AC mains socket NOTE For the protection of your Processor we recommend 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 PAGE 15 QUESTIONS AND ANSWERS Q Do I have to switch the Sampling Frequency when I go between my CD and DAT A No Your STUDIO 2 automatically senses the input frequency and does all necessary are Q Iam not getting any sound through the Processor What could be ee A Most likely there has been a simple mistake in installation Check all connections IN and OUT of the Processor Is the digital source component powered Check all power connections Have you selected the correct source on the STUDIO 2 and preamp Check the front panel LED s for power supply stability Ifyou still have no sound turn off the power and contact your dealer Q Ihave some very fine audiophile interconnect cable which has superior sonic characteristics Can I use this for my coaxial digital input A You may experiment with any high quality cable Do note that most audio interconnect cable is not designed to carry the ultra high frequency information of the digital bit stream NOTE For the STUDIO 2 we recommend non capac
8. age of this unit is determined by the factory and can only be changed by an authorized KRELL distributor or the KRELL factory Any unauthorized voltage conversion will void the warranty Should the operating voltage of your STUDIO 2 require changing contact KRELL Industries Please do not return any unit to KRELL for repair without first calling to discuss the problem and to obtain a Return Authoriza tion number Freight to the factory or distributor is your re sponsibility Return freight to you will be paid by the factory or distributor Any unauthorized disassembly updates or modifica tions performed to the unit will void the warranty PAGE 19 KRELL 35 Higgins Drive Milford CT 06460 1993 KRELL DIGITAL STUDIO29303 Be SALES 203 874 3139 FAX 203 878 8373
9. d induce hum 2 As with any high quality component ensure that the vent openings in the chassis are free from obstruction allowing the Processor to dissipate heat created by its power supply and Class A output stage Place the unit on a clean level surface away from excessive dirt or moisture Make sure the STUDIO 2 has at least 2 inches of clearance on either side and 2 3 inches of space at the top Components that are heat sensitive should not sit directly above the unit 3 The STUDIO 2 does not require additional mass coupling or isolation You may experiment with feet or cones as long as they do not permanently affix to the chassis Any unauthorized modifications to the electronics or chassis will void the warranty PAGES AC POWER AC POWER CONSIDERATIONS NOTE While the STUDIO 2 has superb regulation and does not require a dedicated AC circuit we strongly advise against any connections through extension cords or multiple AC adaptors High quality 15 amp grounded AC strips are acceptable High quality AC line conditioners or filters can be utilized if they are grounded and meet or exceed the unit s power supply rating of 150VA CAUTION Do not remove or bypass the ground pin on the end of the AC cord This may cause RFI radio frequency interference to be induced into your playback system PAGE 6 CONNECTIONS INPUT AND OUTPUT CONNECTIONS CAUTION When making connections to this component or any other make
10. itive coaxial cable which has a bandwidth in excess of 10MHZ and excellent shielding properties PAGE 16 QUESTIONS AND ANSWERS Q While listening to my STUDIO 2 I experience occasional periods of silence through my speakers Is my Processor malfunc tioning A Drop outs are caused by two primary reasons First drop outs can be caused by data corruption Corruption in the data may be due to a poor input connection damaged or dirty source material or interconnects which do not have wide enough bandwidth The second item that causes the Processor to reset is the presence of a transient spike on the incoming AC power line The Processor is resetting all of its digital processing circuits so that it can be assured that all 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 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 Processor 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 fiber optic cable will eliminate this problem The way
11. should be taken in selecting the type of cable used to link the digital source to your Processor We suggest the AT amp T wide bandwidth fiber optic cable be used The AT amp T format has a bandwidth of approximately 50 MegaBit This allows accurate transmission of the digital bit stream without data corruption and proves to be sonically superior If the AT amp T format is not available a high quality quartz fiber optic cable TOSH format can work well Using a fiber optic interconnect reduces ground loop problems often associated with quality audio systems If coaxial cable is used it should be non capacitive and have a bandwidth in excess of 1OMHz to prevent drop out errors For best results with coaxial cable we recommend the AES EBU balanced format The AES EBU format is a 5 volt balanced digital transmission Because of the high voltage balanced for mat this system allows for accurate data transmission and has great sonic advantages over standard single ended coaxial or Tosh fiber optic terminations The AES EBU coaxial cable must have two conductors and a shield for balanced termination PAGE 9 CONNECTIONS How to connect AT amp T cables a Remove the plastic cover from the outside of the AT amp T transmitter located on Transport and receiver located on Pro cessor b Locate the slot on the top of the AT amp T receptacle c Locate the Key on the top of the AT amp T cable d Remove the plastic cap from both ends of
12. sure the power amplifier is OFF and the preamplifier is in the MUTE or STANDBY mode 1 Connect the power cord to the back of the STUDIO 2 and plug the unit into the wall AC receptacle 2 Connect the STUDIO 2 analog output to the line level input of your preamplifier The STUDIO 2 is equipped with two analog output configurations Single ended via RCA connectors and balanced via XLR connec tors If your preamplifier has high level balanced inputs we recommend the balanced outputs of the Processor be used There are considerable sonic benefits associated with the use of balanced interconnection The XLR pin configuration is described below Pin 1 Ground Pin2 Non inverting 0 Pin 3 Inverting 180 NOTE The two outputs can be used to simultaneously feed 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 PAGE 7 CONNECTIONS 3 The Left and Right channel RCA outputs are labeled on the back panel The balanced outputs are not labeled The balanced connector closest to the Left RCA output is for the left channel output and the connector closest to the RCA right output is the right balanced output Care should be taken to insure that the channel orientation between the Processor and the high level inputs of your preamplifier is maintained 4 Connect the digital output of your CD transport and other
13. the lowest level you can hear Check to see that both channels are working correctly before advancing the volume PAGE 13 OPERATION NOTE While your STUDIO 2 will perform beautifully from the moment you turn it on it requires a minimum warm up period of 8 hours before it begins to show its strongest sonic qualities It will continue to improve over time 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 Refer ence contact your authorized Krell dealer We wish you many hours of listening fulfillment PAGE 14 QUESTIONS AND ANSWERS Q My CD player has both fiber 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 component and the Processor This minimizes the possibility of ground loops in the digital components The AT amp T format also has the added benefit of substantially higher bandwidth than coax or the standard fiber optic interface If a coax cable must be used we suggest the AES EBU balanced format This inter connection utilizes a 5v digital format and the additional benefit of balanced termination Q Will I damage my STUDIO 2 if I leave the power ON all the time A No
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