Adcom GFA-6002 AV receiver
Contents
1. 15 ADCOM A division of Klein Technology Group LLC 8541 East Anderson Drive Scottsdale Arizona 85255 Voice 480 607 2277 Fax 480 348 9876 http www adcom com GFA6002_06_manual_v12. e Bridgeable operation e Audio IN and OUT for each channel for flexible system configuration e Independent input level controls for each channel e Independent power supplies for each channel e Fewer gain stages improve signal reproduction accuracy e Custom toroidal power transformer provides better regulation and greater peak current capability e Independent thermal overload and distortion LEDs for all channels e High quality gold plated 5 way binding posts e High quality gold plated RCA jacks e Large independent internal heatsinks for greater cooling capability of output devices e Two convenient modes of power ON OFF triggering 3 30V AC DC triggering amp audio signal sensing e Heavy gauge anodized aluminum front panel e Powder coated baked chassis and top cover for greater durability e Cooling vents for greater efficiency and cooler operation while driving low impedance loads e Ground lift to eliminate ground loops e Detachable AC cord for easier installation 6 ADCOM GFA 6006 02 Owner s Manual GFA 6006 Features e Precision matched devices used throughout the signal path e 60 000 uF of power supply filter capacitance to optimize transient response e Bridgeable operation 6 5 4 3 channels e Audio IN and OUT for each channel for flexible system configuration e Independent input level controls for each channel e Independent power supplies for each channel e Fewer gain stages improve signal repro
3. s Manual the Cable TV incoming signal line round 75Q at the wall or the first component the cable is connected to i e the cable box or VCR If the hum is no longer present you must insert a 750 ground loop isolator before reconnect ing the line You should check with your ADCOM dealer to obtain one If the 750 ground loop isolator works only partially or not at all then please read note 2 to complete the troubleshooting procedure Note 2 Make sure that the power amplifier is at least 6 from processor or other equipment using microprocessors Usually putting another component between them is suf ficient to minimize the hum If this does not reduce the hum turn the system off and disconnect all Inputs from the amplifier If the hum still persists then your dealer or service center must examine the unit system If the hum disappears try another set of RCA cables Connect one RCA cable at a time to see if one specific cable is responsible If any or all cables cause the hum to appear then the unit should be evaluated for proper operation by your dealer or authorized service center Please see our website or call us for a list of authorized service centers in your area Servicing ADCOM has a technical service department to answer questions pertinent to the installation and operation of your unit In the event of difficulty please contact us for prompt advice If your problem cannot be resolved through our combined
4. efforts we may refer you to an authorized repair agency or authorize return of the unit to our factory To aid us in directing you to a convenient service center it would be helpful if you indicate which major city is accessible to your home Please address mail inquires to ADCOM Service 8541 East Anderson Drive Scottsdale Arizona 85255 USA Phone Fax or Email inquires to Voice 480 607 2277 or Fax 480 348 9876 Monday through Friday 8 00 AM to 4 00 PM MST Email service adcom com For fax inquires please include a return fax number for the reply When calling or writing about your ADCOM product be sure to note and refer to its serial number as well as the date of purchase and the dealer from whom it was purchased In any communications to us please include a daytime phone number where we may reach you In the event the unit must be returned to our factory for service you will be instructed on the proper procedure when you call or write for a return authorization Under no circumstances should your unit be shipped to our factory without prior authorization or packed in other than its original carton and fillers If the original shipping carton and its fillers have been lost discarded or damaged a duplicate carton may be obtained from our service department for a nominal charge Always ship prepaid via United Parcel Service UPS or other approved carrier Do not ship via parcel post since the packing was not desi
5. have been provided with vents to allow the necessary cooling of the internal components It is imperative that these vents are not obstructed in any way We recommend that you do not stack other components on top of the GFA 6002 6006 This is particularly important if your system includes low impedance loudspeakers which are difficult to drive or if you will consistently demand high volume levels from the amplifier and speaker system Not only will heat generated by the amplifier affect the performance of equipment stacked on top of the GFA 6002 6006 but the free flow of air through the ventilating slots in the amplifier may be partially obstructed If you observe these recommendations the GFA 6002 6006 will perform reliably in any reasonable environment You should also pay attention to such normal considerations as protection from excessive dust and moisture Occasional vacuuming of accumulated dust on the chassis panels and around the ventilating slots should be all that is required The optimal performance of your new GFA 6002 6006 will ultimately depend on the care with which you make the connections between the amplifier pre amplifier surround sound decoder and the loudspeakers All input and output signal connections should be made only with high quality low loss low capacitance cables following the recommendations in the Inputs and Outputs section of CONNECTING THE GFA 6002 6006 Connecting the GFA 6002 and G
6. or to damage to products or parts caused by misuse accident Acts of God such as lightning or fluctuations in electrical power improper installation improper maintenance or use in violation of instructions provided in this Owner s Manual or to products which have been altered or modified This warranty does not extend to products which have had the serial number removed altered defaced or rendered illegible 7 Physically damaged products are not covered by this warranty and will be returned as received without repair ADCOM GFA 6006 02 Owner s Manual 13 GFA 6002 Specifications Power Rating To IEC CEA 490A Requirements 70 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1 0 THD 100 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1 0 THD Bridged Power 175 Watts continuous average power one channel into 8 ohms at any frequency between 20Hz and 20kHz with at less than 1 0 THD IM Distortion SMPTE 1 Watt to 70 Watts into 6ORINS 2 6 se 6 cece end te te waita oes 82a el ORs wa ot 6 vie Wess d as 508 ae Ra E alee ee ee lt 0 05 IM Distortion CCIF Any Combination from 4kHz to 20kHz 70 Watts into bohm ers 004 Gk eee EF be eee aly Hate ee ae eNews cea eee dees Gale Peake lt 0 01 Frequency Response 1 Watt into 8 Ohms 1OHZtO 20KHZ 26 a eedes sie eal SAS eicet
7. D OPERATION for more details 7 Amplifier Outputs The GFA 6006 6002 s connections to the loudspeakers are made through high grade 5 way binding post terminals There are two terminals for each speaker which are colored RED 6 Input Level Adjustment for the positive output and BLACK Each channel has an input level adjustment The purpose of this adjustment is to balance levels in installations where physical circumstances may create a large difference in volume Turn the level control to the fully clockwise position for maximum sensitivity turning the control counter clockwise reduces sensitivity Use a small blade screwdriver to adjust In balanced operation only the input adjustments for channels 1 3 and 5 GFA 6006 or channel 1 GFA 6002 for the negative output The binding posts will accept a variety of connector types the most secure and prevalent of these is the U type spade connectors at least 0 25 wide and maximum width of 0 57 The terminal will also accept bare wire up to AWG10 and banana type plugs single or dual In connecting the amplifier to the loudspeaker it is vital to maintain proper polarity positive to positive negative to negative in stereo operation On the GFA 6006 6002 the positive terminal is color coded RED ADCOM GFA 6006 02 Owner s Manual 9 and labeled and the negative is color coded BLACK and labeled The positive terminal o
8. E THIS POLARIZED PLUG WITH AN EXTENSION CORD RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE CAUTION POWER LINES Any outdoor antenna must be located away from all power lines OUTDOOR ANTENNA GROUNDING If an outside antenna is connected to your tuner or tuner preamplifier be sure the antenna system is grounded so as to provide some protection against voltage surges and built up static charges Section 810 of the National Electrical Code ANSI NFPA No 701984 provides information with respect to proper grounding of the mast and supporting structure grounding of the lead in wire to an antenna discharge unit size of grounding conductors location of antenna discharge unit connection to grounding electrodes and requirements for the grounding electrode a Use No 10 AWG 5 3 mm copper No 8 AWG 8 4 mm aluminum No 17 AWG 1 0 mm copper clad steel or bronze wire or larger as a ground wire b Secure antenna lead in and ground wires to house with stand off insulators spaced from 46 feet 1 221 83 m apart c Mount antenna discharge unit as close as possible to where lead in enters house d Use jumper wire not smaller than No 6 AWG 13 3 mm copper or the equivalent when a separate antenna grounding electrode is used See NEC Section 810 21 j EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE INSTRUCTIONS CONTAINED IN ARTICLE 810 RADIO AND TELEVISION EQUIPMENT p
9. FA 6006 When connecting the amplifier to the loudspeaker it is vital to maintain proper polarity positive to positive negative to negative On the GFA 6002 6006 the positive terminal is color coded RED and labeled and the negative is color coded BLACK and labeled The positive terminal on the speaker will be color coded RED or will be labeled pos positive 8 ohms or 4 ohms The negative terminal on the speaker will be color coded BLACK or will be labeled neg negative C Common G or ground We recommend that your speaker cables be terminated with U type spade connectors These will give the most contact area insuring long term reliability The spade connector should have a maximum width of 0 57 inches and an opening width of no less than 0 25 To properly connect the speaker cable to the binding posts turn the insulated head of the binding post clockwise until the wire or connector is firmly secured Finger pressure is sufficient and you should not use pliers or other tools which could damage or over tighten the binding post assembly The binding posts have been designed in such a way that finger pressure is all that is required to cause a pinching action among the different metal surfaces to ensure proper connection It is very important to use the correct size of wire in order to avoid unnecessary loss of amplif
10. GFA 6002 amp GFA 6006 Custom Install Power Amplifiers ADCOM WELCOME Dear Fellow ADCOM Product Owner Welcome to the ADCOM family For more than twenty years ADCOM products have delivered excellent performance and value for customers around the world Our products are designed by our experienced and demanding engineering team built to the highest standards in our factory and sold and serviced through dealers custom installers and other retailers whose primary goal is your complete satisfaction We know you are anxious to hear your new power amplifier in action but please take a few minutes to read this owner s manual before connecting the power amplifier to your system It is particularly important that you connect your power amplifier to your preamplifier while they are unplugged and your other equipment is turned off This will protect your equipment from potential short circuits that may occur during installation In addition it is important that you allow for adequate ventilation around your power amplifier and other equipment since excessive heat buildup can shorten the life of any electronic product including the power amplifier Once you have correctly connected your new power amplifier to your other components you should be able to enjoy many trouble free years of performance We conduct a thorough quality and performance test on each and every power amplifier we build in our factory prior to shipment In the rare
11. If the AC Fuse has not failed the Power LED is out and the Thermal Protection LED does not glow this would indicate that the thermostat within the transformer has opened Once the temperature within the transformer decreases to a normal level the thermostat will reset itself automatically and normal operation will resume If you are to avoid continually tripping the thermostat in the transformer you must reduce the sound level demands correct the load impedance of the loudspeakers or both 2 Thermal Protection The GFA 6002 6006 are provided with a thermal protection circuit which will shut down the individual amplifiers if its heatsink temperature reaches 85 C The Thermal Protection LEDs will light whenever the thermal protection circuit in its respective channel has been triggered and the amplifier is inoperative The thermal protection circuitry will typically be triggered by very high power demands into impedances much lower than the amplifier is capable of driving at those levels If any amplifier channel s output through the loudspeaker s ceases abruptly and its Thermal Protection LED glows you will know that its heatsink temperature has become unacceptably high and the circuitry is protecting the amplification devices Please note that the Power LED will remain on and the amplifier will still be energized Once the temperature of the heatsink s drops to a safe operating level that amplifier will automatica
12. a auiii 2 a SE wba oe elec ee aw eo ee See 0 0 25dB Power Bandwidth 3d B 1 0 0 cece ce ce eee ee eee e eee e eee esene 5Hz to 130kHz Dynamic Headroom Into 4 Ohms 6 0 cece eee eee eee e eee e eens 1 8 dB Signal to Noise Ratio A Weighted ZO Watts inta 8 ONIN si s5 co co sosniiai eamin isis aia E Siew we me Sean nerd ra MRE GUN Siow E E E wand Bae gt 100dB GAIN ie reese Se E E eared wares SAILS Onis ee Sa R te War SSSA EMA a ww Sia es SR eile 8 BAe aA wale ana aca 29dB npu Sensi VI oe oie eid are e are ee hee BRE ae Oe ee eo ate awe We Rae eee S wie a SEE Rae wl AA variable INDUtIMPEGANCE 6 2 2 5505 de eee pee eRe eh bee eee TEER eee eae eee EE ae ees 17k ohms Damping Factor 2OHZ to 2OKHZ cc0ses eee eeedie oo ESET SG ERROR EEO Oa oa EEE EHO see ee ee Tea eaes ae gt 400 Rise Time 5kHz 90V peak to peak square wave 20 to 80 6 cee ee tee eee eee eee eee e nee 2 7uS Power Consumption Continuous All Channels Driven QUIGESCEN tia sssr ccd hale bls Bia wae Aine Bet oe bE REG Aral a oe 4 oa ES ald LAE RREAS RS Ce RRR e ee dda eee 30VA Ma iMUM sie sea seats avers cag a ede eco Since ice atin id ue tonta ad eign RRL a a a dni Bea E egal ase 600VA General Power available in 230VAC by special order 0 eee ce eee eee eens 115VAC 50 60Hz Chassis Dimension 00 cece eee eee eee teens 3 76 2mm x 17 432mm x 11 5 292 1mm Maximum Dimensions 000 c cec
13. ay cause the Thermal Protection to be activated or in extreme cases damage your loudspeakers channel two LON channel one GFA 6006 Rear Panel GFA 6002 Rear Panel we have the power Model GFA 6002 Frequency 50 60Hz Voltage 120V Power consumption 450W max please visit www adcom com AVIS Risque de ch Description of Unit Rear Panel 4 Inputs amp 5 Outputs The audio inputs and outputs for the GFA 6002 and GFA 6006 are through high quality gold plated RCA jacks to minimize high frequency losses noise etc They will accept standard RCA type plugs one for each of the channels To insure that the performance designed into the amplifier is preserved you should use the highest quality audio cables possible The GFA 6002 and 6006 feature inputs and outputs for each channel to allow daisy chaining of channels or additional amplifiers in an installation To direct signal from one channel to another connect an appropriate cable RCA to RCA male to male from the output of one channel to the input of the desired channel bi if mano input O line in line out In bridged operation see Bridged Operation only the Bridged Mono Input is to be used On the GFA 6006 bridged mono inputs are channels 1 3 and 5 On the GFA 6002 bridged mono input is channel 1 For daisy chaining the corresponding outputs for these channels are active we have the power are effective see BRIDGE
14. case of a defect that may occur after shipment we stand behind our power amplifier with a five year parts and labor warranty To register for this warranty please complete and mail the enclosed warranty card back to ADCOM Also please keep a copy of your sales receipt with the owner s manual so you may provide proof of eligibility for the warranty should the need arise We know you will be very happy with the audio performance of your new power amplifier We hope you will also consider other ADCOM products such as our line of multichannel amplifiers preamplifiers and digital source components In addition we design and manufacture comple mentary products such as surge suppressors and speaker selectors Please visit our web site at www adcom com to learn more about our complete line of stereo home theater and distributed audio video products On behalf of all of us at ADCOM want to thank you for selecting our product for your home or business entertainment system Sincerely Nyt Mex Douglas Klein President ADCOM is a registered trademark of Klein Technology Group LLC ADCOM Telephone 480 607 2277 A division of Klein Technology Group LLC Fax 480 348 9876 8541 East Anderson Drive Email info adcom com Scottsdale Arizona 85255 USA Web www adcom com Copyright 2003 Klein Technology Group LLC All rights reserved No part of this manual may be repro duced or electronically transmitted without the express written co
15. duction accuracy e Custom toroidal power transformer provides better regulation and greater peak current capability e Independent thermal overload and distortion LEDs for all channels e High quality gold plated 5 way binding posts e High quality gold plated RCA jacks e Large independent internal heatsinks for greater cooling capability of output devices e Two convenient modes of power ON OFF triggering 3 30V AC DC triggering amp audio signal sensing e Heavy gauge anodized aluminum front panel e Powder coated baked chassis and top cover for greater durability e Cooling vents for greater efficiency and cooler operation while driving low impedance loads e Ground lift to eliminate ground loops e Detachable AC cord for easier installation Installing the GFA 6002 and GFA 6006 During normal home operation the internal heatsinks of the GFA 6002 6006 may become warm However there are instances during high level playback into low impedances when the heatsinks will become much warmer than usual To ensure the amplifier s long term trouble free operation it is necessary to provide adequate ventilation for the heatsinks Therefore the GFA 6002 6006 should be kept away from external sources of heat such as radiators and hot air ducts The GFA 6002 6006 should never be placed with other heat producing components in a cabinet or enclosure lacking free air flow The top and bottom panel of the amplifier s chassis
16. e cee eee e ees 3 5 88 9mm x 17 432mm x 12 5 317 5mm Weight c ss00 54 idee one be EEEE EEEE sea aay ae de EEE oak Sake eat es 18 lbs 8 2kg Weight Packed ssis acces Fe Soa Ce eee NE inni dianne d Oe eee EN EN See Eee Se eee Oe eS 21 lbs 9 5kg 14 ADCOM GFA 6006 02 Owner s Manual GFA 6006 Specifications Power Rating To IEC CEA 490A Requirements 70 Watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1 0 THD 100 Watts continuous average power into 4 ohms at any frequency between 20Hz and 20kHz with all channels driven at less than 1 0 THD Bridged Power 175 Watts continuous average power one channel into 8 ohms at any frequency between 20Hz and 20kHz with at less than 1 0 THD IM Distortion SMPTE 1 Watt to 70 Watts into 6ORINS 2 6 se 6 cece end te te waita oes 82a el ORs wa ot 6 vie Wess d as 508 ae Ra E alee ee ee lt 0 05 IM Distortion CCIF Any Combination from 4kHz to 20kHz 70 Watts into bohm ers 004 Gk eee EF be eee aly Hate ee ae eNews cea eee dees Gale Peake lt 0 01 Frequency Response 1 Watt into 8 Ohms 1OHZtO 20KHZ 26 a eedes sie eal SAS eiceta auiii 2 a SE wba oe elec ee aw eo ee See 0 0 25dB Power Bandwidth 3d B 1 0 0 cece ce ce eee ee eee e eee e eee esene 5Hz to 130kHz Dynamic Headroom Into 4 Ohms 6 0 cece eee eee eee e eee e eens 1 8 dB Signal to Noise Ratio A Weighted ZO Wat
17. e shipped again In the unlikely event damage has occurred notify your dealer immediately and request the name of the carrier so a written claim to cover shipping damages can be initiated The right to a claim against a public carrier can be forfeited if the carrier is not notified promptly in writing and if the shipping carton and packing materials are not available for inspection by the carrier Save all packing materials until the claim has been settled Safety Instructions APPLICABLE FOR USA CANADA OR WHERE APPROVED FOR THE USAGE CAUTION TO PREVENT ELECTRIC SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT INSERT FULLY ATTENTION POUR EVITER LES CHOCS ELECTRIQUES INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND CLASS 1 LASER PRODUCT Complies with DHHS 21 CFR 1040 10 and 1040 11 DANGER INVISIBLE LASER RADIATION WHEN YOU OPEN THE TOP COVER AVOID DIRECT EXPOSURE TO LASER BEAM CAUTION USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED IN THIS MANUAL MAY RESULT IN HAZARDOUS RADIATION EXPOSURE DANGER Visible and invisible laser radiation when open and_ interlock failed or defeated Avoid direct exposure to beam WARNING There are no user serviceable parts inside Refer all servicing to qualified service personnel WARNING To reduce the risk of fire or electric shock do not expose the unit to moisture
18. ed Transformer thermal protection engaged I2V DC triggering malfunctioning Power LED glows but no sound One channel not disconnected or loose producing sound Speaker disconnected Internal protection engaged Hum from all speakers Hum from all speakers hum goes up or down with volume between components to the preamp AC Power Cord s not plugged in Preamp or source unit is not on Connections in rear of amp are loose INPUT s or OUTPUT s connector Ground loop difference in ground voltages Problem with source unit CD tape etc or RCA cable connecting that source unit POSSIBLE SOLUTION Plug in AC Power Cord s Replace AC Fuse s Wait until unit cools down It will reset Reset power switch manually Check connection of 12V DC trigger at source Make sure whole system is on Verify all connections on rear of amp Verify both connections on that channel Verify connection at speaker Bring to Dealer or Service Center If Cable TV is present see Note 1 If Cable TV is not present see Note 2 Try different source tuner tape etc and or different RCA cable Hum from the amplifier Some major appliance dimmer halogen or Make sure all appliances dimmers and itself fluorescent light is creating interference suspect lights are off Troubleshooting Use the troubleshooting notes above to solve common situations that don t require professional attention If the ste
19. f a pre amplifier Usually this would mean that when you turn on off your pre amplifier you would have to turn on off your power amplifier separately We have however provided the ability to control the OFF ON function actually powering up from standby of the amplifier by a 12 Volt DC output jack on the rear of certain ADCOM pre amplifiers and tuner pre amplifiers When using this feature the rear panel Power Switch must be left in the in auto position To connect you will need a mono mini phone plug to a mono mini phone plug cable of appropriate length not included to reach from the rear panel jack of the amplifier to the rear panel of the pre amplifier Contact your dealer for information on using this feature with ADCOM and other brand pre amplifiers Although 12V DC is optimal the circuit will operate from approximately 3 to 30V AC or DC not to exceed 250mA The center conductor tip is positive When using the 3 30V AC DC triggering method the unit will return to standby approximately two channel three and one half minutes after the signal is no longer present Audio Signal Sensing Alternately the sensing of audio signal can turn on the 6002 6006 amplifier Any time the amplifier detects the presence of an incoming audio signal it will power up from standby Please note that the speed of turn on by AC DC triggering and audio sensing is different AC DC triggering is slightly faster When
20. gned to withstand rough parcel post handling Improper shipment of the product will void your warranty coverage Warranty ADCOM a division of Klein Technology Group LLC makes the following limited warranties These limited warranties extend to the original purchaser or any person receiving this product as a gift from the original purchaser and to no other purchaser or transferee There is no warranty provided by ADCOM for products purchased from unauthorized outlets or dealers or from previous owners Limited Five Year Warranty Home Non Commercial Use Only ADCOM warrants this product against defects in materials or workmanship for a period of five 5 years after the date of original retail purchase from an ADCOM authorized dealer During this period ADCOM will repair or replace a defective product or part at our option with a new or refurbished product or part without charge to you as long as you follow the procedures listed below Limited Ninety 90 Day Warranty Commercial Use Only ADCOM warrants this product against defects in materials or workmanship for a period of ninety 90 days after the date of original purchase from an ADCOM authorized dealer During this period ADCOM will repair or replace a defective product or part at our option with a new or refurbished product or part without charge to you as long as you follow the procedures listed below All implied warranties including implied warranties of merchan
21. ier power in the cable reduction of amplifier damping factor and other undesirable conditions Sound audio engineering practice suggests the use of at least AWG16 stranded copper cable Recommended capacitance of the speaker wire should not exceed 50pF per foot This insures high frequencies will not be rolled off All loudspeakers having a nominal impedance down to 4 ohms can be connected to and driven by the GFA 6002 6006 The amplifier can drive these low impedance speakers at more than adequate power levels with no difficulty It should be noted that many loudspeaker systems which are nominally rated at 4 ohms drop in impedance in some parts of their frequency range to as low as 2 ohms and sometimes less You will not experience difficulties even with these very low impedance loads unless you demand excessively high volume levels from your system We do not recommend that you run multiple sets of speakers to each speaker output on the GFA 6002 6006 Instead we recommend that you use a multiple speaker selector such as the ADCOM GFS 300 or GFS 600 A speaker selector enables you to maintain good sonic integrity while giving you the flexibility to add speakers throughout your house and maintain proper impedance levels to help prevent over heating of the amplifier Finally we suggest that you follow this chart for speaker wire lengths and gauges If longer runs are needed it is best to consult with your ADCOM Dealer
22. lly resume operation Activation of the Thermal Protection circuitry in any of the channels of amplification in the GFA 6002 6006 is an indication that the amplifier has been over driven or that the load the loudspeakers are presenting to the amplifier is unreasonably low If you wish to prevent recurrent activation of the thermal protection circuitry you must reduce the volume level demands or correct the load impedance condition which may be causing activation of this circuitry 3 Distortion Alert The Distortion Alert circuit is a unique ADCOM distortion detection system which reads all forms of non linear distortion such as THD IM slew induced clipping etc The Distortion Alert LEDs will light when distortion reaches approximately 1 regardless of impedance voltage current phase angle or the reactance of the loudspeakers which the amplifier is driving Sometimes when the amplifier is in use the LEDs may occasionally flicker during high volume listening particularly if you are driving BE low impedances This flickering is no cause for concern The LEDs are simply warning you that the amplifier is approaching its maximum power output into the particular loudspeakers you are using If however the Distortion Alert LEDs glow brightly or are illuminated most of the time during playback you are over driving the amplifier and should turn down your volume control to reduce the listening level Otherwise it m
23. n the speaker will be color coded RED or will be labeled pos positive 8 ohms or 4 ohms The negative terminal on the speaker will be color coded BLACK or will be labeled neg negative C Common G or ground ee ee Note Bridged operation requires different loudspeaker connections For details see the section Bridged Operation 8 Bridged Operation In bridged operation the output of two stereo amplifier channels are combined to drive one monophonic speaker In the bridged mode the GFA 6002 and 6006 wattage capability increases to 175 Watts at 8 ohms per bridged channel The GFA 6006 allows for any of three adjoining pairs of amplifiers to be bridged For input directions see the section Audio Signal Inputs and Outputs To engage bridged operation for a pair of amplifier channels switch the corresponding toggle switch to the bridged position In bridged operation the proper loudspeaker connection is to the POSITIVE terminals of each of the pair of bridged channels Do Not connect the Negative speaker terminals under any circumstances in the bridged mode 9 3 30V AC DC Triggering The GFA 6002 and GFA 6006 are very high power amplifiers and as such must be directly connected to the wall outlet or an appropriate surge protector or AC line conditioner It must never be connected to the switched outlets on the rear panel o
24. nsent of Klein Technology Group LLC TABLE OF CONTENTS WelCOMNG 3 i264 ros cins r ceduwdvaoueds as 2 Table of Contents c20ecesn ad teea ae es 3 Precautions and Warnings e 8 4 Unpacking Your Amplifier 5 Safety Information eceeeees 5 Description amp Features 6 Installing amp Connecting 7 Description of Front Panel 8 Front Panel Illustration 8 Description of Rear Panel 9 11 Rear Panel Illustration 9 Trouble Shooting ssesessessesees 12 Service Information 12 13 Wallanty lt 204xscnsne E waxes 13 Your Responsibilites 13 GFA 6002 Specifications 14 GFA 6006 Specifications 15 ADCOM GFA 6006 02 Owner s Manual 3 THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS Warning To reduce the risk of fire or electric shock do not expose this unit to rain or moisture CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN The graphic symbol of a lightning flash with an arrow point within a triangle signifies that there is dangerous voltage within the unit and it poses a hazard to anyone removing the cover to gain access to the interior of the unit Only qualified service personnel should make any such attempt The graphic symbol of an exclamation point within an equilateral t
25. nterference by one or more of the following measures e Reorient or relocate the receiving antenna TV radio etc Increase the separation between the equipment and receiver Connect the equipment to an outlet on circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for additional help Caution This device complies with part 15 of the FCC Rules operation is subject to the following to conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation cE CLASS 1 LASER PRODUCT ADCOM GFA 6006 02 Owner s Manual 5 Description of Unit Congratulations on your decision to purchase the GFA 6002 or GFA 6006 custom installation power amplifier The GFA 6002 and GFA 6006 have been designed to be musically accurate in a configuration specifically designed to integrate with any home audio pre amplifier You have made a wise choice that will reward you for years to come with exceptionally accurate and musical sound reproduction To realize the full potential of your new amplifier and before making any connections to it please read these operating and installation instructions thoroughly GFA 6002 Features e Precision matched devices used throughout the signal path e 27 000 uF of power supply filter capacitance to optimize transient response
26. or water Do not allow foreign objects to get into the enclosure If the unit is exposed to moisture or a foreign object gets into the enclosure immediately disconnect the power cord from the wall Take the unit to a qualified service person for inspection and necessary repairs Read all the instructions before connecting or operating the component Keep this manual so you can refer to these safety instructions Heed all warnings and safety information in these instructions and on the product itself Follow all operating instructions Clean the enclosure only with a dry cloth or a vacuum cleaner You must allow 10 cm or 4 inches of unobstructed clearance around the unit Do not place the unit on a bed sofa rug or similar surface that could block the ventilation openings If the unit is placed in a bookcase or cabinet there must be ventilation of the cabinet to allow proper cooling Keep the component away from radiators heat registers stoves or any other appliance that produces heat The unit must be connected to a power supply only of the type and voltage specified on the rear panel Connect the component to the power outlet only with the supplied power supply cable or an exact equivalent Do not modify the supplied cable Do not defeat grounding and or polarization provisions The cable should be connected to a 3 pin polarized wall outlet matching the wide blade of the plug to the wide slot of the receptacle Do not use ex
27. ower lines 7 ground camp service entrance conductors antenna _ service lead in wire entrance _ equipment ground wire ab ground clamps Be NR power service grounding electrode system e g interior metal water pipe antenna discharge unit to external antenna terminals of radio receiver i ground wire a b 1 ground clamps bonding j jure d Se optional antenna groundin feet ctrode driven e 4 M into the earth if required by ocal M NOTE TO CATV SYSTEM INSTALLER This reminder is provided to call the CATV system installer s attention to Article 82022 of the National Electrical Code that provides guidelines for proper grounding and in particular specifies that the cable ground shall be connected to the grounding system of the building as close to the point of cable entry as practical Unpacking the Amplifier Before your new ADCOM amplifier left our factory it was carefully inspected for physical imperfections and tested for all electrical parameters as a routine part of ADCOM s systematic quality control This along with full operational and mechanical testing should ensure a product flawless in both appearance and performance After you have unpacked the GFA 6002 06 inspect it for physical damage Save the shipping carton and all packing material as they are intended to reduce the possibility of transportation damage should the amplifier ever need to b
28. ps stated in possible solution do not resolve your prob lem then please contact your ADCOM dealer or call the ADCOM customer service department Any problems not covered here should be brought to the attention of your ADCOM dealer or ADCOM customer service department A special note on hum When there is a low volume hum audible throughout your speakers even with the main volume turned all the way down you have a com mon phenomenon known as a ground loop A ground loop is basically a difference in ground voltages between two or more components which are connected electrically and which creates multiple current paths where there must only be one This difference in potentials creates a 60Hz low level sound approximately a low A that seems to hum It can be caused by adding new components to your system but that does not imply there is anything electrically wrong with any new component With the advent of audio video and home theater systems the problem has become com monplace Generally the cause is the Cable TV incoming signal line This new incoming line may add an additional ground at a different potential to the AC line ground of your other equipment refer to note and 2 to trouble shoot a hum problem Note 1 Cable TV systems can sometimes contribute to ground loop problems which cause hum To determine if your cable system is the contributing factor disconnect 12 ADCOM GFA 6006 02 Owner
29. r devices including amplifiers that produce heat The unit should be connected to a power supply outlet only of the voltage and frequency marked on its rear panel The power supply cord should be routed so that it is not likely to be walked on or pinched especially near the plug convenience receptacles or where the cord exits from the unit Clean unit only as recommended in its instruction manual The power supply cord of the unit should be unplugged from the wall outlet when it is to be unused for a long period of time Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through any openings This unit should be serviced by qualified service personnel when A The power cord or the plug has been damaged or B Objects have fallen or liquid has been spilled into the unit or C The unit has been exposed to rain or liquids of any kind or D The unit does not appear to operate normally or exhibits a marked change in performance or E The device has been dropped or the enclosure damaged DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ATTENTION POUR PREVENIR LES CHOCS ELECTRIQUES NE PAS UTILISER CETTE FICHE POLARISEE AVEC UN PROLONGATEUR UNE PRISE CE COURANT OU UNE AUTRE SORTIE CE COURANT SAUF SI LES LAMES PEUVENT ETRE INSEREES A FOND SANS EN LAISSER AUCUNE PARTIE A DECOUVERT CAUTION TO PREVENT ELECTRIC SHOCK DO NOT US
30. riangle warns a user of the device that it is necessary to refer to the instruction manual and its warnings for proper operation of the unit Do not place this unit on an unstable cart stand tripod bracket or table The unit may fall causing serious injury to a child or adult and serious damage to the unit Use only with a cart stand tripod bracket or table recommended by the manufacturer or sold with the unit Any mounting of the device should follow the manufacturer s instructions and should use a mounting accessory recommended by the manufacturer Read all the safety and operating instructions before connecting or using this unit Retain this notice and the owner s manual for future reference All warnings on the unit and in its operating instructions should be adhered to All operating and use instructions should be followed Do not use this unit near water For example near a bathtub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool The unit should be installed so that its location or position does not interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built in installation such as bookcase or cabinet that may impede the flow of air through its ventilation openings The unit should be situated away from heat sources such as radiators heat registers stoves or othe
31. tability and fitness for a particular purpose are limited in duration to the duration of the warranty period This warranty excludes all incidental and consequential damages unless contravened by state law This warranty gives you specific rights and you may have other rights which vary from state to state No person agent distributor dealer or company is authorized to change modify or extend the terms of these warranties in any manner whatsoever Your Responsibilities The above warranties are subject to the following conditions 1 You must retain and present your dated invoice or bill of sale to provide proof of original purchase from an ADCOM Authorized Dealer and coverage under the warranty period 2 You must notify us within ten 10 days after you discover a defective product or part 3 All warranty servicing of this product must be done by ADCOM or an authorized ADCOM Service Center 4 This warranty is only valid if this product has been purchased and used in the United States Warranty coverage for products purchased and used outside of the United States is provided by local ADCOM authorized distributors 5 Charges by third parties for set up installation adjustments shipment insurance and other charges are not covered by this warranty 6 This warranty extends only to defects in material or workmanship as limited above and does not extend to any product or part which has been lost or discarded by you
32. tension cords Do not route the power cord where it will be crushed pinched bent exposed to heat or damaged in any way Pay particular attention to the power cord at the plug and where it exits the back of the unit The power cord should be unplugged from the wall outlet if the unit is to be left unused for a long period of time Immediately stop using the component and have it inspected and or serviced by a qualified service agency if e the power supply cord or plug has been damaged e objects have fallen or liquid has been spilled into the unit e the unit has been exposed to rain e the unit shows signs of improper operation or e the unit has been dropped or damaged in any way FCC Information This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the i
33. tion may cause serious damage to the amplifier circuits may create a hazard fire and may void the warranty If the Power LED does not glow it may be an indication that the AC fuse has blown If you are using the 12V DC Triggering feature it may be possible that there is a problem with that connection To determine if the problem is caused by a malfunction in the 12V DC system remove the small plug inserted into the I2V DC Triggering jack Press the front panel power switch to turn off the amp and immediately re press the power switch If the problem is caused by the 12V DC triggering circuit the amp will turn on and the LED will glow DO NOT attempt repair of the 12V DC system If you are not sure or the amplifie displays other symptoms please consult the RESOLVING PROBLEMS section Fuse Replacement Since the fuse has a ceramic body and you cannot visually examine the fuse element it is suggested that you replace it with an identical substitute or bring the fuse to your ADCOM dealer so they may check its integrity 11 AC Power Cord The AC cord provides power to operate all the GFA 6002 6006 s circuits Its plug can be connected to a standard wall outlet provided the outlet supplies a voltage compatible with the power requirements printed on the rear panel of the GFA 6002 6006 ADCOM GFA 6006 02 Owner s Manual 11 6006 SYMPTOM Power LED does not glow No sound POSSIBLE REASON AC Fuse s fail
34. to maximize the performance of your system with your exact conditions up to 24 feet AWGI6 up to 36 feet AWGI4 up to 58 feet AWGI2 Description of Unit Front Panel 1 On Standby Vacation This LED monitors the status of operation of the amplifier The LED will glow amber whenever the rear panel Power Vacation switch is in the OFF powered down with only minimal circuitry energized or AUTO position amplifier is in the standby mode When powered up from AUTO using the 3 30V AC DC triggering or signal sensing feature the LED will change to red changing back to amber when there is no longer signal present or the 3 30V AC DC triggering is not energized The LED will glow red whenever the rear panel power switch is in the ON and the GFA 6006 6002 is energized The Power LED indicates that there is AC voltage being fed to the amplifier but it does not signify that the entire amplifier s circuits are in operation If for example one of the Thermal Protection LEDs glows that amplifier channel will not produce sound even though the Power LED may still glow Additionally the internal power transformer is provided with a thermostat which will interrupt power into the transformer if its temperature exceeds 125 C This high temperature will seldom if ever be encountered unless the amplifier is subjected to abnormal conditions such as operation into loads of less than 3 ohms at very high listening levels
35. ts inta 8 ONIN si s5 co co sosniiai eamin isis aia E Siew we me Sean nerd ra MRE GUN Siow E E E wand Bae gt 100dB GAIN ie reese Se E E eared wares SAILS Onis ee Sa R te War SSSA EMA a ww Sia es SR eile 8 BAe aA wale ana aca 29dB npu Sensi VI oe oie eid are e are ee hee BRE ae Oe ee eo ate awe We Rae eee S wie a SEE Rae wl AA variable INDUtIMPEGANCE 6 2 2 5505 de eee pee eRe eh bee eee TEER eee eae eee EE ae ees 17k ohms Damping Factor 2OHZ to 2OKHZ cc0ses eee eebdie oo OECTA ERE ee EEO OOo a EE EHO see ee EERE Te ae eaes ae gt 400 Rise Time 5kHz 90V peak to peak square wave 20 to 80 6 cee ee tee eee eee eee eee e nee 2 7uS Power Consumption Continuous All Channels Driven Q lescent s rcseo ocd ale ble insan Glens Bet oie SE REG Aral wile 4 Soe a RS Ras Lk RR EAS Ble ek Ree E doe RSLS 45VA MAXUM eeen aaa e e We R E E EA torte E EA IRS a a ea dni Buda E E RS 1440VA General Power available in 230VAC by special order 0 cece ee cee eee ee eens 115VAC 50 60Hz Chassis Dimension 00 c eee cece ee eee eens 4 75 120 7mm x 17 432mm x 14 5 368 3mm Maximum Dimensions 0 0c ccc cece eens 5 25 133 4mm x 17 432mm x 15 5 393 7mm Weight c 0s00 54 idea fone Seca eae ht Loca eee ee baa whe Se Meal ea ee EEEa 33 lbs 15kg Weight Packed ssis a eee eos So ae Ce eee Nee sa NESE Oe a eR N WE ee eee eee eee Oe eS 38 lbs 17 2kg ADCOM GFA 6006 02 Owner s Manual
36. using the signal sensing method the unit will return to standby approximately two and one half minutes after the signal is no longer present An incoming signal level of 5 7 mV is required to trigger this sensing method 10 AC Fuse The AC Fuse protects the electronic circuits of the GFA 6002 6006 This fuse normally will fail only if there is an overload within the GFA 6002 6006 It may however fail if the amplifier attempts to deliver very high power into very low impedance loudspeakers In either case BE SURE TO REPLACE THE AC FUSE ONLY WITH AN EXACT REPLACEMENT FUSE 10 ADCOM GFA 6006 02 Owner s Manual The proper fuse values are GFA 6002 for 120 volt operation Fuse Rating 5 Amp 250 Volt Buss AGC 5 250V Littlefuse 3AG 312005 250V GFA 6002 for 230 volt operation Fuse Rating 3 Amp 250 Volt Buss AGC 3 250V Littlefuse 3AG 312003 250V GFA 6006 for 120 volt operation Fuse Rating 12 Amp 250 Volt Buss AGC 12 250V Littlefuse 3AG 3120012 250V GFA 6006 for 230 volt operation Fuse Rating 6 Amp 250 Volt Buss AGC 6 250V Littlefuse 3AG 312006 250V Before attempting to replace a failed fuse be certain to unplug the AC Power Cord from the AC wall outlet to prevent possible electrical shock Replace the AC fuse only with one identical in type and rating as printed on the rear panel DO NOT USE ANY SUBSTITUTE FUSES WITH DIFFERENT RATINGS OR VALUES Failure to observe this precau
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