Krell Industries KAV-150a User's Manual
Contents
1. nent or any other make sure the power amplifier is off and the preamplifier is in the mute or stand by mode Make sure all cable terminations are of the highest quality free from frayed ends shorts or cold solder joints INPUT AND OUTPUT CONNECTIONS To prevent the introduction of hum or other noise into the system organize all wiring between the KAV 150a and other system components neatly Separate AC wires from audio cables 1 Connect the cables from your speakers to the output terminals of the amplifier The KAV 150a amplifier utilizes five way binding post speaker terminals for the left and right channels The speaker terminals accept spade lugs bare wire banana plugs or pins The red termi nals are used for positive connections and the black terminals are used for the negative connections 2 Connect the interconnect cables from your preamplifier to the input terminals of the amplifier The KAV 150a amplifier is equipped with balanced and single ended inputs The balanced inputs use three pin XLR connectors and the single ended inputs use RCA connectors Krell recom mends the use of balanced intercon nects Balanced interconnects not only have the ability to minimize sonic loss but also have immunity to induced noise especially for installations using long cable lengths Balanced connections KRELL KAV 150a have 6dB more gain than single ended connections When level matching is crit ical2. To return a product to Krelle please fol low this procedure so that we may serve you better 1 Obtain a Return Authorization Number R A number and shipping 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 prepay all ship ping charges The product may also be hand delivered if arrangements with the Service Department have been made in advance Proof of purchase may be re quired for warranty validation at the time of hand delivery 3 Use the original packaging to insure the safe transit of the product to the factory dealer or distributor The use of any packaging material other than the original packaging materials is not recommend ed 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 non standard packaging or if the original packaging was so damaged that it was unusable If Krell determines that new packaging is required the owner will be notified before the product is returned KRELL KAV 150a To purchase additional packaging please contact your authorized Krell dealer distributor or the Krell Service Department for assistance Krell is not responsible for any damage incurred in transit Krell will file claims for damages as necessary for products dam aged in transit to the factory The owner i
3. G RELL KAV 150a The Leader in Audio Engineering Power Am p lifier Instructions for Use v 98 0 Owner s Reference KAV 150a Power Amplifier Page INTRODUCTION 3 UNPACKING 3 PLACEMENT 4 Cabinetry Considerations 4 AC Power Guidelines 4 Krell Industries Inc CONNECTING THE KAV 150a 45 Connair Road TO YOUR SYSTEM Orange CT 06477 3650 USA Input and Output Connections 5 Configuring the KAV 150a TEL 203 799 9954 for Bridged Operation 6 FAX 203 799 9796 AMPLIFIER OPERATION 6 E MAIL krell krelloni On Off and Stand by Operation 6 i j revonuine GOM System Noise Considerations 7 WEB SITE www krellonline com WARRANTY Ca RETURN AUTHORIZATION PROCEDURE 9 SPECIFICATIONS Back Cover 1998 by KRELL Industries Inc All rights reserved P N 1960101900088 CE Marking This product complies with the EMC direc tive 89 336 EEC and the low voltage directive 73 23 EEC Introduction Thank you for your purchase of the Krell KAV 150a Power Amplifier The name Krell has always represented components that are the premier performers in their product categories The KAV 150a power amplifier continues in this Krell tradition The KAV 150a is a stereo amplifier that may be bridged into monaural operation Designed as a compact component with exceptional sound the KAV 150a may be interfaced easily into multi amplifier sys tems using the 12 V trigger and the bridg ing capability The KAV 150a uses prov
4. introducing a new component into a system If there is a low frequency hum emanating from the speakers when the KAV 150a amplifier is placed into the system follow these simple troubleshooting steps before contacting your authorized Krell dealer dis tributor or Krell 1 Check all input and output connections making sure they are of sound construc tion With the amplifier off remove the in KRELL KAV 150a terconnect wiring and turn the amplifier on If the hum disappears turn the ampli fier off and reinsert one of the intercon nect cabies Then turn the amplifier back on lf the hum reappears with one or both interconnects reinserted there may be a defective cable Have the interconnect cabling checked before proceeding lf the interconnects prove to be sound you may be experiencing a ground loop This can often be easily eliminated Con tact your authorized Krell dealer distrib utor or Krell English Page 7 of 12 Warranty Krell warrants this product to be free from defects in material or workmanship for a period of five years for circuitry and three years for all mechanical components from the original date of purchase 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 Transfer of warranty to a second owner occurs automatically Please con tact Krell to have the name o
5. keep this specification in mind WARNING a Use only one set of inputs to the amplifier at a time The KAV 150a amplifier is shipped with shorting pins in the XLR inputs These pins should remain in the XLR inputs if the KAV 150a amplifier is operating in the sin gle ended mode When the shorting pin is inserted pins 1 and 3 are shorted together The shorting pins must be removed to con nect the KAV 150a amplifier for balanced operation The XLR pin configuration is described below Pin 1 Ground Pin 2 Non inverting 0 Pin 3 Inverting 180 3 Connect the receptacle end of the AC power cord to the IEC power connector in the back panel of the KAV 150a Connect the AC power cord wall plug into a stan dard AC wail outlet 4 The amplifier is now ready for operation See Amplifier Operation on page 6 12 VDC REMOTE POWER IN This input accepts 12 volt power on off signals from other Krell components as well as from other devices that incorpo rate a 12 volt power on off trigger output This allows for remote turn on off of the KAV 150a with the power activation of another Krell component as well as with other components used in a custom installation English Page 5 of 12 12 VDC REMOTE POWER OUT This output sends 12 volt power on off sig nals to other Krell components as well as other devices that incorporate a 12 volt power on off trigger input This allows for remote turn on off
6. PONSE 20 Hz 20 kHz 0 0 0 1 dB 5 Hz 150 kHz 0 0 3 0 dB SIGNAL TO NOISE RATIO 112 dB A weighted DISTORTION 1kHz 0 06 THD 20 kHz 0 25 THD GAIN 25 8 dB INPUT SENSITIVITY 1 8 Vrms INPUT IMPENDENCE 100K Ohms OUTPUT VOLTAGE Peak to peak 116V RMS 41V KAV 150a Power Amplifier OUTPUT POWER each channel driven 8Ohms 600 W bridged 8 Ohms 150W 4 Ohms 300 W POWER CONSUMPTION Idle 40 W Max 600 W DIMENSIONS 19w x 3 7h x 15 5d in 47 5w x 9 25h x 38 75d cm WEIGHT Shipped 33 Ibs 14 9 kg Unit only 25 Ibs 11 4 kg All operational features functions specifications and policies are subject to change without notification
7. cable lengths amplifier power is wasted in the cable Long speaker cables reduce the maximum power that can be delivered to the speakers Page 40f 12 English CABINETRY CONSIDERATIONS The KAV 150a amplifier can become quite warm under normal operation Install the KAV 150a in a location that provides unob structed ventilation IMPORTANT The ventilation grids on top of the KAV 150a need to be unobstructed at all times during operation Do not place flammable material on top of or beneath the KAV 150a For installation inside cabinetry extra ventila tion may be necessary Make sure the KAV 150a has adequate air circulation Generally two inches of clearance on each side of the amplifier and eight inches of clearance above the amplifier will provide adequate ventilation In more extreme instances small fans can aid in removing excess heat from internal spaces Contact your dealer distributor or Krell for more information AC POWER GUIDELINES For best performance Krell recommends using a dedicated AC power line rated at a minimum of fifteen amps with the KAV 150a amplifier The KAV 150a amplifier should only be operated with the power cord sup plied Please consult your dealer distributor or Krell before using any devices designed to alter or stabilize the AC power for the KAV 150a KRELL KAV 150a Connecting the KAV 150a to Your System WARNING When making connections to this compo
8. en Krell circuits built with the same high qual ity resistors output devices and internal electrical components used in all other Krell products From input to output the KAV 150a uses discrete fully complemen tary circuitry All circuits up to the driver stage operate in pure Class A The KAV 150a employs a wide bandwidth design with a very low negative feedback for sonic accuracy throughout the frequency spectrum This owners reference manual contains important information on the placement installation and operations of the KAV 150a Please read this information carefully A thorough understanding of these details will help insure satisfactory operation and a long life for the KAV 150a and related sys tem components KRELL KAV 150a The KAV 150a is backed by a comprehen sive 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 your warranty registration card or contact your dealer distributor or Krell Unpacking 1 Open the box and remove the top layer of foam You will see these items 1 KAV 150a 1 AC power cord 2 spare speaker fuses 1 packet containing an introductory letter from Dan D Agostino C E O the Owners Reference and the Warranty Registration Card Note lf any of these items are not included please contact your authorized Krell dealer or dis tribu
9. ese transients to damage most loudspeak ers All switching of sources should be done with the preamplifier level either muted or fully attenuated Do not change inputs to the ampli _ fier while the amplifier is on Note Care must be taken when setting high play back levels Because of their tremendous reserve of clean power Krell amplifiers can safely drive speakers to higher sound pressure levels than other amplifiers Always turn the level down at the first sign of speaker distress ON OFF AND STANDBY OPERATION When powering up any system amplifiers should always be turned on last and turned off first 1 Press the power button on the front panel of the KAV 150a Power Amplifier You will hear a click The amplifier is ready for operation 2 With the system preamplifier in the mute position or the volume control fully atten uated select a source Turn the volume control up to the desired listening level 3 When turning the system off lower the volume of the system preamplifier com pletely or place it into the mute or stand _ by position Turn the KAV 150a off It is now safe to turn off the rest of the system KRELL KAV 150a SYSTEM NOISE CONSIDERATIONS AC grounding becomes critical when con necting high performance audio components When mixing and matching audio compo nents each with their own ground potential a low frequency hum may occur in one or both speakers This often occurs when
10. n the war ranty changed Transfer of warranty does not extend the duration of the original war ranty period Note This warranty does not apply to damage caused by acts of God or nature The warranty period begins on the date of retail purchase as noted on the retail sales slip provided by an authorized Krell deal er or distributor or on the warranty regis tration card sent to Krell In the event that an adequate proof of purchase date is unavailable the warranty period will begin on the date the product was originally shipped from the factory The warranty described in this paragraph shall be in lieu of any other warranty express or implied including but not limited to any implied warranty of merchantability or fitness for a particular purpose There are no war ranties 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 pur chase use or inability to use this product even if Krell has been advised of the pos sibility of such damages Page 8of 12 English The warranty for this Krell product is valid only in the country to which the product was originally shipped through the autho rized Krell distributor for that country and at the factory There may be restrictions on or changes to Kreil s warranty because of regulation
11. of the KAV 150a with the power activation of another Krell compo nent as well as with other components used in a custom installation Note Consult the owners manual of any device used in a custom installation to take full advantage of the remote capability of the KAV 150a CONFIGURING THE KAV 150a FOR BRIDGED OPERATION The KAV 150a may be configured to operate in a bridged mode To implement this configu ration 1 Turn the KAV 150a off 2 Locate the red switch on the back of the amplifier and slide it from the NORMAL position to the BRIDGED position The numeral 2 will appear on the switch when the switch is in the BRIDGED position 3 Connect the interconnect cable to the BRIDGED input either balanced via the XLR connector or single ended via the RCA connector Do not use both inputs simultaneously Connect the speaker cables to the speaker terminals labeled BRIDGED and BRIDGED The amp lifier is now ready for bridged operation Page 6 of 12 English Amplifier Operation It is easy to understand the operation of the KAV 150a amplifier However great care needs to be exercised when operating a sys tem that includes the KAV 150a because of the amplifiers enormous power output Switching between active sources without muting the preamplifier output or bump ing miscuing a cartridge can generate large transients at low frequencies The KAV 150a amplifier may generate enough power with th
12. s responsible for filing claims for shipping dam ages that occur during the return shipment Replacement parts and or products will be furnished 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 In the event that Krell receives a product for warranty service which has been modified in any way without Krell authorization all war ranties on that product will be void The product will be returned to original factory layout specifications at the owners expense before it is repaired All repairs required after the product has been returned to original factory specification will be charged to the customer at current parts and labor rates 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 krell krellonline com KAV 150a PRODUCT SERIAL NUMBER To register your product for warranty benefits complete and return the Warranty Registration Card enclosed in the shipping box within 15 days of purchase Thank you English Page 9 of 12 Krell Industries Inc 45 Connair Road Orange CT 06477 3650 USA TEL 203 799 9954 FAX 203 799 9796 E MAIL krell krellonline com WEB SITE www krellonline com Specifications FREQUENCY RES
13. s within a specific country Please check with your distributor for a complete understanding of the warranty in your country 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 out side the U S A and wish to have it ser viced at the factory all freight and associ ated 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 product from the freight forwarder to you are also your responsibility The operating voltage of this product is determined at the factory and can only be changed by an authorized Krell distributor or at the factory The voltage for this prod uct in the U S A cannot be changed for six months from the original purchase date Any unauthorized voltage conversion disassembly component replacement perforation of chassis updates or modifications performed to the product will void the warranty KRELL KAV 150a Return Authorization Procedure IMPORTANT If you believe there is a problem with your component please contact your dealer dis tributor or the Krelle 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 Request Form on our web site at www krellonline com
14. tor immediately for assistance 2 Carefully remove the unit and acces sories from the box Remove the protec tive plastic wrap from the unit Note Save all packing materials If you must ship your KAV 150a in the future repack the unit in its original packaging to ee transit damage THERE ARE NO USER SERVICEABLE PARTS INSIDE ANY KRELL PRODUCT Please contact your authorized dealer distributor or Krell if you have any questions not addressed in this refer ence manual English Page 3 of 12 Placement WARNING The amplifier must not be located where it could be exposed to dripping or splashing fluids Before you install the KAV 150a into your system review the following guidelines to choose the location for the KAV 150a This will facilitate a clean trouble free installation The KAV 150a does not require any type of special rack or cabinet for installation For the dimensions of the KAV 150a see Specifications on page 10 Place the KAV 150a amplifier on a firm level surface away from dirt or moisture Ideally the amplifier should be placed as close to the speakers as possible Run long bal anced interconnect cables to the amplifier and keep the speaker cable length to a min imum Speaker cable adds impedance to the load the amplifier must drive regardless of the cable s gauge All Krell amplifiers will drive the lowest impedances with ease but when impedance is added due to long
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