Krell Industries KRC 2 User's Manual
Contents
1. KRC 2 OWNER S REFERENCE A INTRODUCTION Thank you for your purchase of the KRELL KRC 2 remote control preamplifier The KRC 2 combines the latest evolutions in preamplifier technology with a radical ee to remote control circuitry The KRC 2 is part of a new generation of KRELL products where conve nience is united with exceptional sonic quality To obtain the best performance from your KRC 2 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 KRC 2 and related system components This Owner s Reference is divided into several sections each designed to perform a different function As you read through the Owner s Reference you will become better acquainted with the features and functions that make the KRC 2 a superb value A Question and Answer section is included where answers to common questions are provided Should you have any questions or sugges tions please feel free to contact your authorized dealer or the KRELL staff for assistance In the unlikely event that your KRC 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 ser vice please consult your warranty registration card your authorized KRELL Deale2. TAPE selects Tape and allows monitoring of Tape return PHASE Inverts absolute polarity of the main output LED illuminates when phase is reversed 180 degrees when GAIN Low 6 dB High 12 dB LED illuminates in high position MUTE No signal output when LED is On BALANCE lt Left channel attenuation in 1 dB increments and OFF BALANCE gt Right channel attenuation in 1dB increments and OFF VOLUME Custom electronic volume control See notes in section F 10 G REMOTE CONTROL 1 When a function button on the remote control is ressed the blue pilot LED will flash on the KRC 2 hen the button 1s released the flashing stops 2 The functions of the remote control are described below UP arrow volume higher DOWN arrow volume lower SI selects S1 input S2 selects S2 input S3 selects 3 input S4 selects S4 input Bl selects B1 input B2 selects B2 input TAPE selects Tape input and allows tape monitoring PHASE 0 or 180 degrees LED illuminates when the phase is reversed 180 degrees GAIN Low 6 dB High 12 dB LED illuminates in high position MUTE No signal output with LED on BALANCE lt Left channel attenuation in 1 dB increments and OFF BALANCE gt Right channel attenuation in 1 dB increments and OFF BATTERY INSTALLATION NOTE Batteries should be replaced when the KRC 2 functions from the remote control are not readily accessible 1 Remove the four hex head screws from the bottom ortion of the remote co
3. d Plug the KRC 2 into the wall AC receptacle The Pilot LED on the KPE should illuminate gone with the KRC 2 The input select will default to the mute position Should the KPE pilot LED not illuminate unplug the KRC 2 from the wall AC receptacle and check all of your connections Should you have difficulty powering the KRC 2 and the KPE together please contact Krell for assistance 3 If you are not using the KPE plug the AC cord into the receptacle on the back of the unit Plug the remaining end into the wall AC receptacle The pilot LED will illumi nate and the KRC 2 will default to the Mute position NOTE While the KRC 2 has superb regulation and does not require a dedicated AC circuit we strongly advise against any connections through extension cords or mul tiple AC adaptors High quality 15 amp line conditioners or grounded AC strips are acceptable NOTE The KRC 2 provides two special remote connec tors on the backpanel These are provided for future room remote and remote slave formats Please consult the KRELL staff for assistance on these developments es NOILV TIVESNI ns E INPUT AND OUTPUT CONNECTIONS CAUTION When making connections to this component or any other make sure the power amplifier is OFF CAUTION Make sure all cable terminations are of the hi quality free from frayed ends shorts or cold solder joints 1 Connect the left and right ue of your source com ponents to the inputs on
4. illuminated to the point where level is set In the single LED mode only one LED is illuminated at the level setting To change from bar grr mode to single LED mode press an hold the E button for approximately 3 seconds Level will now be indicated with a single LED Hold the MUTE button in again for 3 seconds to change the dis play back to the bar graph mode The display can only be changed via the front panel NOTE When changing the volume display do not select the mute position before trying to change the apan When you are changing the volume display and holding in the mute button the mute LED will not illuminate Basic Operation 1 Press the Mute button briefly on the KRC 2 2 Turn the volume control fully counterclockwise to the Off position no LED s illuminated 3 Turn the power amplifier On 4 Choose a listening source and select that input b pushing the corresponding input button on the KRC 2 5 Start play of the source 6 Slowly turn the volume control clockwise until you reach a comfortable listening level 7 When changing sources return to the Mute position and or lower the volume This insures that the next source you play will not be potentially damaging to your system with a high output transient 8 Enjoy es NOLLVHHdO ns FRONT PANEL DESCRIPTION INPUT SELECTION SI selects S1 input 52 selects S2 input S3 selects S3 input Bl selects B1 input B2 selects B2 input FUNCTIONS
5. the KRC 2 The KRC 2 is equipped with 4 single ended inputs 2 balanced capable inputs a single ended tape input and tape output The single ended and balanced inputs are labeled S 1 through S 4 B 1 and B 2 respectively to allow customization in the set up of your system There is no difference between the four single ended inputs or be tween the two balanced inputs 2 Connect the output of the KRC 2 to the input of your _ power amplifier The KRC 2 has both Balanced outputs via standard XLR type connectors and single ended outputs via standard RCA type connectors The po assignment for the XLR connectors is pin I shield ground pin 2 non inverting input hot pin 3 inverting input NOTE The RCA center conductor for each channel is wired in parallel with pin 2 the non inverted output Only one of these outputs should be connected to a single stereo amplifier NOTE When connecting inputs or outputs to the KRC remember the balanced connections will have 6dB of gain more than the single ended connections When level DES is critical in your install keep this specification in mind REAR PANEL DESCRIPTION INPUTS Four single ended inputs via standard RCA connectors Two balanced inputs via standard XLR connectors Bl B2 TAPE Tape input via standard RCA connectors TAPE OUTPUT Record via RCA connectors MAIN OUTPUTS Single ended RCA output connectors Balanced XLR output connectors XLR input
6. and output pin configuration pin 1 Ground shield pin 2 0 degrees non inverting pin 3 180 degrees inverting ees SNOILOANNO msn F BASIC PREAMPLIFIER OPERATION The KRC 2 has the flexibility of a remote controlled device but does not require special attention in order to pee simple functions The KRC 2 will function much ike other Krell preamplifiers The unit can be operated from the front panel controls or via the remote control All functions available on the front panel can also be accomplished from the KRC 2 remote control This gives you the ability to sit in your favorite listening position and control all preamplifier functions Notes on the Volume Control The level control on the KRC 2 is quite unique in that the output level is indicated by illuminated LEDs around the outside of the level control not by the physical position of the level control When you change level with the remote control the position of the level control knob does not change When you increase the volume manu ally or by remote control indicator LEDs will illuminate clockwise When you decrease the volume indicator LEDs illuminate counter clockwise When the level is fully off no indicator LEDs will be illuminated This 1s because level is electrically regulated with out the use of a potentiometer The level indicator display for the KRC 2 can be switched between a bar graph mode and a single LED mode In the bar graph mode all LEDs are
7. ll KRELL Industries If the fuse solves the problem carry on listening as usual Q When I push the function buttons on the KRC 2 re control the preamp does not respond What should I 0 A Check or change the batteries in the remote control The remote control will not operate the preamplifier in other rooms not in the remote control s trajectory Make sure you have a direct path from the remote control to the preamp front 13 ms SHAMSNV ANV SNOLLSA00O m I SPECIFICATIONS GAIN 6dB or 12dB SIGNAL TO NOISE lt 95 dB unweighted THD IK lt 0 02 20K lt 0 02 INPUT IMPEDANCE 47 000 ohms 47K OUTPUT IMPEDANCE 10 ohms OUTPUT VOLTAGE 16 volts R M S DIMENSIONS 19 0 WIDE 253 HIGH with feet WEIGHT Unit only 20 pounds packed 26 pounds 14 J WARRANTY AND SERVICE INFORMATION There are no user serviceable parts inside the KRC 2 The KRC 2 has a limited arr 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 war ranty card immediately after successful installation 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 facto
8. ntrol s front plate emove the back plate to expose the battery storage compartment Insert batteries Refer to the polarity drawing while inserting the batteries B Replace the back plate and insert the four hex head Screws KR N es TOULNOD ALONE EE 11 H QUESTIONS AND ANSWERS Q When I turn up the volume on the KRC 2 a loud hum is present from the loudspeakers What could it be A Hum can be caused by several different disturbances Check to make sure all of the cables in and out of the KRC 2 are sound and making proper contact Make sure there are no power supplies or hum inducing components on top of or directly below the KRC 2 You also could be experiencing a ground loop in the system A ground loop can be caused when several components with different ground potentials are in the system Ground loops can often be easily corrected onsult your dealer or KRELL for system grounding considerations Q Can the KRC 2 be used to control more than one system A Yes the KRC 2 has both single ended and balanced outputs that can be used simultaneously to control two seperate systems Q When I select the B1 input on the KRC 2 one channel seems to have less gain than the other Is something wrong with the preamp A More than likely there is not a problem with the KRC 2 The balanced input or output internal cable terminations could be incorrect Switch the suspect cable to the other channel and vice versa
9. r or Distributor 4 5 6 8 10 11 14 15 B TABLE OF CONTENTS UNPACKING AND ASSEMBLY BASIC INSTALLATION AND OPERATION INPUT AND OUTPUT CONNECTIONS BASIC PREAMPLIFIER OPERATION REMOTE CONTROL QUESTIONS AND ANSWERS SPECIFICATIONS WARRANTY AND SERVICE INFORMATION E NOLLJ CGOULN EEE C UNPACKING AND ASSEMBLY 1 a the box and remove the top a of foam The KRC 2 and following items will now be visible 1 KRC 2 remote control 1 Warranty card 1 AC power cord 1 Owner s Reference NOTE If any of these items are not included please contact your authorized dealer immediately for assis tance 3 Remove the plastic bag from the preamplifier and remote control NOTE Save all packing materials If you must ship your KRC 2 in the future repack the unit with the remote control in its original packaging to prevent transit dam age D BASIC INSTALLATION AND OPERATION 1 Place the unit on a firm level surface free from exces sive dirt or moisture The KRC 2 is not particularly hum sensitive therefore other components can be placed on or around the KRC 2 P P are using the separate KPE phono stage with the KRC 2 the following connections apply NOTE If you are not using the KPE proceed to step 3 a Unplug the KRC 2 from the wall AC receptacle b Locate the 9 pin DC power connector labeled KPE POWER c Connect the KPE with the DC power cable supplied oe phono stage to the KPE POWER input on the
10. ry immediately The operating voltage of this unit is determined by the factory and can only be changed by an authorize KRELL distributor or the KRELL factory Any unautho rized voltage conversion will void the warranty Should the operating voltage of your KRC 2 require changing contact KRELL Industries Please do not return any unit to KRELL for repair with out first calling to discuss the probs and to obtain a Return Authorization number Freight to the factory or distributor is your responsibility Return freight to you will be paid by the factory or distributor Any unautho rized disassembly updates or modifications performed to the unit will void the warranty 15 ee OAAS GNVALINVHIUVM eee RRE EE KRELL INDUSTRIES aa 45 Connair Road Orange Ct USA 06477 3650
11. to determine whether a cable is defective If the problem switches to the other channel it is a defective cable If the problem does not move to the other channel and remains the same after cables have been switched check the wiring at the input of the KRC 2 with the same process If it is not cable or source related call your dealer or KRELL Check to make sure there are no LED s illuminated in the Balance control section of the front panel If there are correct the balance by pushing the balance contol switches until no LEDs on the balance control section are illuminated 12 Q Why do I have to turn up the volume so high to get music at a normal listening level A If your system does not seem to have enough gain over all you are probably not utilizing the balanced input or output capabilities of the KRC 2 For every balanced termination on the KRC 2 you increase the gain by 6dB If you still have to increase the gain too far make sure the KRC 2 is in the HIGH gain position 9 I came home one evening and the pilot LED in the RC 2 was not illuminated What should I do A Unplug the KRC 2 from the wall AC receptacle and check the fuse in the rear panel If there is a break in the wire inside the fuse replace it If there is no break in the fuse do not try turning on the preamplifier or replacin the fuse Call your dealer or KRELL If the new fuse lets the unit turn on when you plug it in then fails shortly afterward ca
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