Krell Industries 5 User's Manual
Contents
1. The warranty for Krell products is valid only in the country to which they were originally shipped through the authorized Krell distributor for that country and at the factory There may be restric tions on or changes to Krell s warranty because of regulations within a specific country Please check with your distributor for a complete understanding of the warranty in your country If a unit is serviced by a distributor who did not import the unit there may be a charge for ser vice even if the product is within the warranty period Freight to the factory is your responsibility Return freight within the United States U S A is included in the warranty If you have purchased your Krell product outside the U S A and wish to have it serviced at the factory all freight and associated charges to the factory are your responsibility Krell will pay return freight to the U S A based freight forwarder of your choice Freight and other charges to ship the unit from the freight forwarder to you are also your responsibility Krell is not responsible for any damage incurred in transit Krell will file claims for damages as necessary for units damaged in transit to the factory You are responsible for filing claims for shipping damages during the return shipment Krell does not supply replacement parts and or products to the owner of the unit Replacement parts and or products will be furnished only to the distributor performing service on this unit2. within 15 days of purchase Thank you Krell Showcase Amplifier This Krell product has a limited warranty of five years for parts and labor on circuitry Should this product fail to perform at any time during the warranty Krell will repair it at no cost to the owner except as set forth in this warranty The warranty does not apply to damage caused by acts of God or nature The warranty on this page shall be in lieu of any other warranty expressed or implied includ ing but not limited to any implied warranty of merchantability or fitness for a particular purpose There are no warranties which exceed beyond those described in this document If this product does not perform as warranted herein the owner s sole remedy shall be repair In no event will Krell be liable for incidental or consequential damages arising from purchase use or inability to use this product even if Krell has been advised of the possibility of such damages Proof of purchase in the form of a bill of sale or receipted invoice substantiating that the unit is within the warranty period must be presented to obtain warranty service The warranty begins on the date of the original retail purchase as noted on the bill of sale or receipted invoice from an authorized Krell dealer or distributor Previously owned equipment when re purchased from an authorized Krell dealer or distributor has the balance of the original warranty based on the original date of manufacture
3. Krell or other component in a custom installation Note POWER Note Consult the owner s manual of each component used in a custom installa tion to take full advantage of the Showcase Amplifier remote capability 9 IEC Connector and Fuseholder The connector is for use with the provided IEC standard 15 amp power cord The AC mains fuse protects the Showcase Amplifier in the event of an internal fault The AC mains fuse must be replaced with the spare fuse provided Use the 10 A slow blow fuse for 100 120 VAC or the 5 A slow blow fuse for 220 240 VAC Krell Showcase Amplifier Connecting the Showcase Amplifier to Your System INPUT AND OUTPUT CONNECTIONS The Showcase Amplifier is eguipped with balanced and single ended inputs Krell recommends using balanced interconnect cables Balanced interconnect cables not only can minimize sonic loss but are also immune to induced noise especially with installations using long cables Balanced connections have 6 dB more gain than single ended connections When level matching is critical please keep this gain value in mind The Showcase Amplifier is shipped with shorting pins in the XLR inputs These pins should remain in the XLR inputs if the amplifier is operating in the single ended mode When the shorting pin is inserted pins 1 lower left and 3 top are shorted together Remove the shorting pins to connect the amplifier for balanced operation The XLR pin configu
4. circuit Check the loudspeakers and loudspeaker cables for potential short circuits before reconnecting the amplifier to your system THERE ARE NO USER SERVICEABLE PARTS INSIDE THE PREAMPLIFIER Please contact your authorized Krell dealer distributor or Krell if you have any ques tions not addressed in this reference manual This product is manufactured in the United States of America Krell is a registered trademark of Krell Industries Inc and is restricted for use by Krell Industries Inc its subsidiaries and authorized agents Krell Current Mode is a trademark of Krell Industries Inc All other trademarks and tradenames are registered to their respective companies 2002 by Krell Industries Inc All rights reserved P N 306039 Contents Krell Showcase Amplifier INTRODUCTION DEFINITION OF TERMS UNPACKING PLACEMENT AC Power Guidelines FRONT PANEL DESCRIPTION BACK PANEL DESCRIPTION CONNECTING THE SHOWCASE AMPLIFIER TO YOUR SYSTEM Input and Output Connections AMPLIFIER OPERATION On Off and Operation TROUBLESHOOTING SYSTEM NOISE OUESTIONS AND ANSWERS WARRANTY RETURN AUTHORIZATION PROCEDURE SPECIFICATIONS Page o o BHR O0 nm 10 12 12 13 14 15 16 17 lllustrations FIGURE 1 FIGURE 2 Page The Showcase Amplifier Front Panel 5 The Showcase Amplifier Back Panel 7 Krell Showcase Amplifier Introduction Krell Showcase Amplifier Thank you for your purchase of a Krell Showcase Amp
5. lt lt L L Showcase 7 Showcase 6 Showcase 5 Multichannel Amplifier THE LEADER IN AUDIO ENGINEERING Instructions for Use Owner s Reference Showcase 7 Showcase 6 Showcase 5 Multichannel Amplifier Instructions for Use v 02 1 CONTACT INFORMATION WARNINGS Krell Industries Inc 45 Connair Road Orange CT 06477 3650 USA TEL 203 799 9954 FAX 203 891 2028 E MAIL krell krellonline com WEBSITE http www krellonline com cE This product complies with the EMC directive 89 336 EEC and the low voltage directive 73 23 EEC The amplifier must be placed on a firm level surface where it is not exposed to dripping or splashing The ventilation grids on the top bottom and sides of the amplifier must be unob structed at all times during operation Do not place flammable material above or beneath the amplifier Contact your authorized Krell dealer distributor or Krell before using any devices designed to alter or stabilize the AC power for the Showcase Amplifier Before connecting the Showcase Amplifier make sure the amplifier is turned off and any output device such as a preamplifier is in mute or stand by mode Make sure all cable terminations are of the highest quality and free from frayed ends short circuits or cold solder joints Use only one input to each amplifier channel at a time If the red LED flashes when the amplifier is in the stand by mode unplug the amplifier to reset the protection
6. on an exchange basis only any parts and or products returned to Krell for exchange become the property of Krell No expressed or implied warranty is made for any Krell product damaged by accident abuse misuse natural or personal disaster or unauthorized modification Any unauthorized voltage conversion disassembly component replacement perfora tion of chassis updates or modifications performed to the unit will void the warranty The operating voltage of this unit is determined by the factory and can only be changed by an authorized Krell distributor or at the factory The voltage for this product in the U S A cannot be changed until six months from the original purchase date In the event that Krell receives a product for warranty service that has been modified in any way without Krell authorization all warranties on that product will be void The product will be returned to original factory layout specifications at the owner s expense before it is repaired All repairs required after the product has been returned to original factory specifications will be charged to the customer at current parts and labor rates All operational features functions and specifications and policies are subject to change without notification 15 Return Authorization Procedure HOW TO EXPEDITE SERVICE HOW TO RETURN A PRODUCT IMPORTANT HOW TO PURCHASE ADDITIONAL PACKING SERIAL NUMBER If you believe there is a problem with you
7. via XLR connectors 6 channels via 5 way binding posts 12 VDC Out 12 V trigger via a 3 5 mm connector 17 3w x 5 7h x 19 8d 43 9w x 14 5h x 50 3d 66 Ib 29 9 kg 58 Ib 26 2 kg Showcase 5 20 Hz to 20 kHz 0 dB 0 15 dB 2 Hz to 95 kHz 0 dB 3 dB gt 110 dB 26 2 dB 1 kHz lt 0 03 20 kHz lt 0 20 45 kOhms 1 55 Vrms 8Ohms 125 W 40Ohms 250 W Peak to Peak 90 V RMS 32 V Stand by 70 W Idle 110 W Max 1200 W 5 single ended via RCA connectors 5 balanced via XLR connectors 5 channels via 5 way binding posts 12 VDC Out 12 V trigger via a 3 5 mm connector 17 3w x 5 7h x 19 8d 43 9w x 14 5h x 50 3d 64 Ib 29 0 kg 56 Ib 25 3 kg All operational features functions specifications and policies are subject to change without notification Krell Showcase Amplifier Krell Industries Inc 45 Connair Road Orange CT 06477 3650 USA TEL 203 799 9954 FAX 203 891 2028 E MAIL krell krellonline com WEBSITE http Awww krellonline com Showcase 7 Showcase 6 Showcase 5 Multichannel Amplifier v 02 1
8. an trouble free installation The Showcase Amplifier reguires at least two inches 5 cm of clearance on each side and at least two inches 5 cm of clearance above and below the component to provide adeguate ventilation The Showcase Amplifier does not reguire any type of special rack or cabinet for installation For the dimensions of your amplifier see Specifications on page 17 Place the amplifier as close to the loudspeakers as possible and keep the loudspeaker cable length to a minimum Loudspeaker cable adds impedance to the load the amplifier must drive regard less of the cable s gauge Krell amplifiers drive the lowest imped ances with ease but long loudspeaker cables reduce the maximum power that is delivered to the loudspeakers Krell recommends operating the Showcase Amplifier from a dedi cated 15 amp AC power line Please contact your Krell dealer dis tributor or Krell before using any devices designed to alter or stabi lize the AC power for the Showcase Amplifier Krell Showcase Amplifier Figure 1 The Showcase Amplifier Front Panel AMPLIFIER STAND BY o POWER 3 N 321 1 Power Button 2 Stand by LED 3 Power LED Front Panel Description See Figure 1 on page 5 The Showcase Amplifier front panel provides power on and indi cates operating status 1 Power Button Use this button to switch the Showcase Amplifier power between the stand by and t
9. d you hear a click The amplifier is in the operational mode Krell recommends leaving the Showcase Amplifier in the stand by mode unless you will not be playing music for a long time Always turn the amplifier off before changing input connections and mute or fully attenuate the preamplifier level when switching sources The Showcase Amplifier has tremendous reserves of power and safely drives loudspeakers to extremely high sound pressure lev els However use care when setting high playback levels and lower the volume level at any sign of loudspeaker distress Krell Showcase Amplifier Troubleshooting System Noise When you mix and match high performance audio components each with its own ground potential a low frequency hum may occur in one or all loudspeakers If this happens when you place the Showcase Amplifier into your system follow these simple trou bleshooting steps 1 Krell Showcase Amplifier Check that all input and output connections are of sound construction With the amplifier off remove all the interconnect cables then turn the amplifier on If the hum disappears turn the amplifier off and reinsert one of the interconnect cables Turn the amplifier back on If the hum reappears with the interconnect cable reinserted the cable may need to be replaced Turn the amplifier off and con nect a different interconnect cable to the same location Turn the amplifier back on If the hum disappears with the i
10. dio gain stages of a component operate in the current rather than the voltage domain This unique technology provides the component with exceptional speed and a wide bandwidth Krell Showcase Amplifier Unpacking 1 Open the shipping box and remove the top layer of foam The following items are visible 1 Showcase Amplifier 1 Accessory Kit containing AC power cord 12 VDC output 12 V trigger cable spare AC mains fuse 10 A slow blow fuse for 100 120 VAC 5 A slow blow fuse for 220 240 VAC h ek 1 packet containing the owner s reference manual and the warranty registration card IMPORTANT Two people are needed to remove the amplifier from the shipping box 2 Grasp the underside of the amplifier and lift it straight out of the shipping box 3 Place the amplifier in a safe location and remove the protective plastic wrapping Notes Krell Showcase Amplifier If any of these items are not included in the shipping box please contact your authorized Krell dealer distributor or Krell for assistance Save all packing materials If you ship your amplifier in the future repack the unit in its original packaging to prevent transit damage See Return Authorization Procedure on page 16 for more information Placement AC POWER GUIDELINES Before you integrate the Showcase Amplifier into your system review the following guidelines to choose the location for the com ponent This will facilitate a cle
11. he operational modes and also to switch the 12 VDC output 12 V trigger on and off 2 Stand by LED The red stand by LED illuminates when the AC power cord is plugged into the wall The stand by LED flashes when the protec tion circuit is activated 3 Power LED The blue power LED illuminates when the amplifier is in the opera tional mode Krell Showcase Amplifier Figure 2 The Showcase Amplifier Back Panel 6 Outputs 1 7 7 8 T INPUT 1 m INPUT 2 M INPUT 3 m INPUT 4 m INPUT 5 m INPUT 6 m INPUT 7 m 12VDC O OUT IN a O 30mA O max O 4 O cE 6 O A 6 O Showcase Multi channel KN 50 60 Hz Cl Amplifier lt lt EL Ll 6 ourPUr 1 a 2 a 3 a 4 Me 5 a 6 a 7 ONN AG one ORANGE Sen oe O NO USER SERVICEABLE PARTS INSIDE O O O MADE IN USA Balanced Inputs Remote Connections 4 Inputs 1 7 7 12 VDC Remote Power Out Single Ended Inputs 8 12 VDC Remote Power In 5 Inputs 1 7 Power Amplifier Channel 9 IEC Connector and Outputs Fuseholder Back Panel Description See Figure 2 on page 7 BALANCED INPUTS SINGLE ENDED INPUTS The Showcase Amplifier back panel provides connections for all inputs and outputs remote connection input and output links and the AC power supply 4 Inputs 1 7 The Showcase Amplifier has seven channel inputs for output devices with balanced XLR connectors 5 Inputs 1 7 The Showcase Amplifier has seven channel input
12. ical input or output circuit that has equal impedance from both input terminals to a common ground reference point The industry standard for professional and sound recording installations balanced connections have 6 dB more gain than single ended con nections and allow the use of long interconnect cables Balanced connections are less susceptible than single ended connections to induced noise from the system or the environment Single ended A two wire input or output circuit Use care when using single ended connections as the ground connection is made last and bro ken first Turn the system off prior to making or breaking single ended connections Single ended connections are not recommend ed for connections reguiring long cable runs Off When the AC power cord is not plugged into the wall the red stand by LED is not illuminated and the component is off Stand by Mode When the AC power cord is plugged into the wall the red stand by LED illuminates indicating that the component is in the stand by mode This low power consumption status keeps the audio and cir cuits at idle Krell recommends leaving the component in the stand by mode when it is not playing music Operational Mode From the stand by mode when the power button on the front panel is pressed and the blue power LED illuminates the component is in the operational mode and ready to play music Krell Current Mode A proprietary Krell circuit topology in which the au
13. l be notified before the product is returned To purchase additional packaging please contact your authorized Krell dealer distributor or the Krell Service Department for assis tance Your Showcase Amplifier product serial number is Krell Showcase Amplifier Specifications Showcase 7 Showcase 6 Showcase 5 FREOUENCY RESPONSE SIGNAL TO NOISE RATIO A WEIGHTED GAIN TOTAL HARMONIC DISTORTION THD INPUT IMPEDANCE INPUT SENSITIVITY OUTPUT POWER EACH CHANNEL DRIVEN OUTPUT VOLTAGE POWER CONSUMPTION INPUTS OUTPUTS REMOTE CONNECTORS DIMENSIONS INCHES CENTIMETERS WEIGHT SHIPPING UNIT ONLY Showcase 7 20 Hz to 20 kHz 0 dB 0 15 dB 2 Hz to 95 kHz 0 dB 3 dB gt 110 dB 26 2 dB 1 kHz lt 0 03 20 kHz lt 0 20 45 kOhms 1 55 Vrms 8Ohms 125 W 40Ohms 250 W Peak to Peak 90 V RMS 32 V Stand by 90 W Idle 150 W Max 1600 W 7 single ended via RCA connectors 7 balanced via XLR connectors 7 channels via 5 way binding posts 12 VDC Out 12 V trigger via a 3 5 mm connector 17 3w x 5 7h x 19 8d 43 9w x 14 5h x 50 3d 68 Ib 30 8 kg 60 Ib 27 1 kg Showcase 6 20 Hz to 20 kHz 0 dB 0 15 dB 2 Hz to 95 kHz 0 dB 3 dB gt 110 dB 26 2 dB 1 KHz lt 0 03 20 kHz lt 0 20 45 kOhms 1 55 Vrms 8Ohms 125 W 4Onhnms 250 W Peak to Peak 90 V RMS 32 V Stand by 80 W Idle 130 W Max 1400 W 6 single ended via RCA connectors 6 balanced
14. lifier The Showcase Amplifier is a flexible design that delivers five six or seven channels of amplification All three configurations include input and output connections for all seven channels The amplifiers differ only by how many channels are housed within the amplifier A Showcase 5 includes five amplifier channels a Showcase 6 includes six amplifier channels and a Showcase 7 includes seven amplifier channels The Showcase 5 and Showcase 6 may be upgraded with additional channels up to seven The Showcase Amplifier has balanced and single ended inputs for compatibility with other components The amplifiers can be operated using the 12 VDC power on off 12 V trigger signals from other components The Showcase Amplifier is versatile fitting a variety of installations including rack mounted and inside cabinetry Please contact your Krell authorized dealer or distributor for infor mation on upgrading your amplifier to six or seven channels This reference manual contains important information on place ment installation and operation of the Showcase Amplifier Please read this information carefully A thorough understanding of these details helps ensure satisfactory operation and long life for your Showcase Amplifier and related system components Definition of Terms INPUT AND OUTPUT CONNECTIONS OPERATION TECHNOLOGY Following are the definitions of key terms used in your owner s ref erence manual Balanced Asymmetr
15. nterconnect cable reinserted that cable most likely is sound Turn the amplifier off disconnect the interconnect cable and re connect one of the other interconnect cables Repeat steps 3 through 5 until you have checked each inter connect cable If all the interconnect cables appear to be sound and you still have hum you may be experiencing a ground loop Please contact your authorized Krell dealer distributor or Krell for sug gestions on how to eliminate the hum Guestions and Answers Should I turn the Showcase Amplifier off unplug the amplifier when not playing music No Leave the Showcase Amplifier in the stand by mode when not playing music The stand by mode avoids cold starts as well as minimizes heat output and power consumption Turn the amplifier off if you plan to be away for a period of time for example on vacation See Amplifier Operation on page 12 When I turn the amplifier on there is a loud hum through the loudspeakers What should I do When a new component is introduced a low frequency hum may occur in one or both loudspeakers Check that all input and output connections and cables are of sound construction See Troubleshooting System Noise on page 13 If the con nections and cables are sound you may be experiencing a ground loop This can often be easily eliminated Please contact your authorized Krell dealer distributor or Krell for suggestions When I connect the amplifie
16. r component please con tact your dealer distributor or the Krell factory to discuss the problem before you return the component for repair To expedite service you may wish to complete and e mail the Service Reguest Form in the Service section of our website at http www krellonline com To contact the Krell Service Department TEL 203 799 9954 Monday Friday 9 00 am to 5 00 pm EST FAX 203 799 9796 E MAIL service O krellonline com WEBSITE __http Avww krellonline com To return a product to Krell please follow this procedure so that we may serve you better 1 Obtain a Return Authorization Number R A number and ship ping address from the Krell Service Department 2 Insure and accept all liability for loss or damage to the product during shipment to the Krell factory and ensure all freight ship ping charges are prepaid The product may also be hand delivered if arrangements with the Service Department have been made in advance Proof of purchase will be required for warranty validation at the time of hand delivery Use the original packaging to ensure the safe transit of the product to the factory dealer or distributor Krell may at its discretion return a product in new packaging and bill the owner for such packaging if the product received by Krell was boxed in nonstandard packaging or if the original packaging was so damaged that it was unuseable If Krell determines that new packaging is required the owner wil
17. r to my system using the single ended inputs a loud buzz comes from my loudspeakers What is it Check that the shorting pins for the Showcase Amplifier are inserted into the XLR inputs the unit is shipped with the pins in place When using the single ended inputs shorting pins must be inserted between pins 1 and 3 to keep external noise from corrupting the signal For more information see Connecting the Showcase Amplifier to Your System on page 10 I cannot turn the amplifier on Why not Make sure the stand by LED is not flashing If the stand by LED is flashing unplug the amplifier from the AC wall receptacle and then plug it back into the AC wall receptacle If the stand by LED continues to flash contact your Krell authorized dealer or distributor or Krell If no LEDs are illuminated check the power cord and check the AC mains fuse To remove the fuse unplug the power cord from the amplifier and slide out the fuseholder get no signal from one of the amplifier channels when the unit is on Why not Make sure you are not connected to channels 6 or 7 on a Showcase 5 or to channel 7 on a Showcase 6 If you are using the single ended input make sure the shorting pin is inserted between pins 1 and 3 and not between pins 2 and 3 Krell Showcase Amplifier Warranty To register your product for warranty benefits please complete and return the Warranty Registration Card enclosed in the shipping box
18. ration is described below Pin 1 Shield ground Pin 2 Non inverting hot 0 Pin 3 Inverting cold 180 Follow these steps to connect the Showcase Amplifier to your sys tem 1 Make sure all power sources and components are off before connecting inputs and outputs 2 Neatly organize the wiring between the amplifier and all system components Separate AC wires from audio cables to prevent hum or other unwanted noise from being introduced into the system 3 Connect the interconnect cables from your output device to the amplifier inputs using the balanced 4 or single ended 5 inputs located on the back panel The balanced inputs use three pin XLR connectors the single ended inputs use RCA connectors The Showcase 5 uses only inputs 1 through 5 and the Showcase 6 uses inputs 1 through 6 IMPORTANT Use only one input to each amplifier channel at a time You may use the balanced inputs for some of the amplifier channels and the sin gle ended inputs for the remaining channels Krell Showcase Amplifier Connecting the Showcase Amplifier continued INPUT AND OUTPUT 4 Connect the loudspeaker cables to the Showcase Amplifier pt aa channel output binding posts 6 located on the back panel The Showcase 5 uses only outputs 1 5 and has caps on the speaker binding posts for channels 6 and 7 The Showcase 6 uses outputs 1 6 and has caps on the speaker binding posts for channels 6 and 7 The binding post terminals accep
19. s for output devices with single ended RCA connectors IMPORTANT AMPLIFIER CHANNEL OUTPUTS Use only one input to each amplifier channel at a time You may use the balanced inputs for some of the amplifier channels and the single ended inputs for the remaining channels 6 Outputs 1 7 The Showcase Amplifier has seven amplifier channel outputs The loudspeaker binding post terminals accept spade lugs bare wire or pins Use the red terminal for the positive connection and the black terminal for the negative connection IMPORTANT BACK PANEL REMOTE CONNECTIONS Tighten loudspeaker binding posts by hand only 7 12 VDC Remote Power Out The Showcase Amplifier is equipped with an output that sends 12 VDC power on off 12 V trigger signals to other Krell components and other devices that incorporate a 12 V trigger Notes When the component is in the operational mode the 12 VDC Out pro vides 12 V of DC output When the component is in the stand by mode or off the DC output is O V 12 VDC Out 12 V trigger current is limited to 30 mA Krell Showcase Amplifier Back Panel Description continued BACK PANEL REMOTE CONNECTIONS continued 8 12 VDC Remote Power In The Showcase Amplifier is eguipped with an input that receives 12 VDC power on off 12 V trigger signals from other Krell compo nents and other devices that incorporate a 12 V trigger This allows you to turn the Showcase Amplifier on and off using a
20. t spade lugs bare wire or pins Use the red terminal for the positive connection and the black terminal for the negative connection IMPORTANT Tighten loudspeaker binding posts by hand only 5 Plug the end of the AC power cord into the AC wall outlet The amplifier is now ready for operation See Amplifier Operation on page 12 Note The Showcase 5 and Showcase 6 amplifiers may be upgraded with addi tional channels up to seven Please contact your Krell authorized dealer or distributor for information on upgrading your amplifier to six or seven channels Krell Showcase Amplifier 11 Amplifier Operation ON OFF AND OPERATION IMPORTANT IMPORTANT When powering up your system turn the amplifiers on last When powering down your system turn amplifiers off first The proce dures for amplifier operation follow 1 Plug the end of the AC power cord into the AC wall outlet 2 The red stand by LED 2 illuminates When the amplifier is first plugged in there is a brief delay before it can be put in the operational mode Please wait approximately 10 seconds If the red LED flashes when the amplifier is in the stand by mode unplug the amplifier from the AC wall outlet to reset the protection circuit Check the loudspeakers and loudspeaker cables for poten tial short circuits before plugging the amplifier back into the wall outlet 3 Press the power button 1 on the front panel The blue power LED 3 illuminates an
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