Adcom GFA-565 User Manual Download Page 17

 

 

 

 

 

NOTE

 

ACTIVATION  OF  THE  THERMAL  PROTECTION  CIRCUITRY  IN  THE  GFA-565  IS  AN 

INDICATION  THAT  THE  AMPLIFIER  HAS  BEEN  OVERDRIVEN  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, 

RECTIFY  THE  LOAD-IMPEDANCE  CONDITION  WHICH  MAY  BE  CAUSING 

ACTIVATION  OF  THIS  CIRCUITRY,  INSTALL  AN  AUXILIARY  FAN  OPTION  OR,  IN 

EXTREME CASES, UNDERTAKE ALL THREE.   

 

CARING FOR YOUR GFA-565

 

Great  care  has  been  taken  by  ADCOM  to  assure  that  your  amplifier  is  as  flawless  in 

appearance as it is electronically. The front panel is a heavy- gauge, high-grade aluminum 

extrusion  carefully  finished  and  anodized  for  durability.  The  chassis,  top  cover  and  rear 

panel  are  of  heavy-gauge  steel,  both  painted  and  baked.  If  the  front  panel,  top  or  sides 

should become dusty or fingerprinted, they can be cleaned with a soft Iintless cloth, slightly 

dampened with a very mild detergent solution or non-ammonia glass cleaner. 

 

NOTE

 

DO  NOT  SPRAY  OR  USE  LIQUIDS  OF  ANY  KIND  ON  THE  SURFACES  OF  THE 

GFA·555se. DO NOT EXPOSE THE AMPLIFIER TO RAIN, WATER OR MOISTURE OF 

ANY KIND. 

 

 

 

 

SERVICING-North America

 

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 can not be resolved through our combined efforts, we may refer you 

to  an  authorized  repair  agency,  or  authorize  return  of  the  unit  to  our  plant.  To  aid  us  in 

directing you to a convenient service station, it would be helpful if you indicate which major 

city is accessible to your home. 

Summary of Contents for GFA-565

Page 1: ...HIGH CURRENT POWER AMPLIFIER GFA 565 The contents of this manual are subject to change Please check our website www adcom com or www adcom usa com for the most current version Copyright 2011 Adcom LLC...

Page 2: ...can drive a very broad range of loudspeakers including those with very low impedances at sustained high power levels even when the impedances are highly reactive Great care was taken to insure that di...

Page 3: ...her efficiency was insured by using a toroidal design Additionally thermal and dynamic tracking of the bias for the triple Darlington driver and output stages is provided to insure that the amplifier...

Page 4: ...outer carton If any number is altered or missing you should notify us immediately in order to insure that you have received a genuine ADCOM product which has not been opened mishandled or tampered wi...

Page 5: ...t only will the heat generated by the amplifier affect the performance of equipment stacked on top of the GFA 565 but the free flow of air through the ventilating slots provided in the chassis of the...

Page 6: ...lication Your ADCOM dealer can help select the best cable for your needs RIGHT LEFT INPUT Unbalanced The audio inputs to the GFA 565 are through two high quality gold plated brass RCA jacks using Tefl...

Page 7: ...OUTPUT should be connected to the right channel loudspeaker as you face the pair of loudspeakers and the LEFT STEREO OUTPUT to the left channel loudspeaker Be certain when the GFA 565 is used in Its...

Page 8: ...hich you should observe in order to insure maximum performance from your amplifier It is most important that you make certain the wiring you have selected has as Iowa capacitance as possible All ampli...

Page 9: ...wer levels with no difficulty It should be noted here that many loudspeaker systems which are rated nominally at 4 ohms drop in impedance in some parts of their frequency range to as low as 2 ohms and...

Page 10: ...inal of the loudspeaker to the negative terminal of the loudspeaker and vice versa Repeat the listening test with the mono signal to make sure you are correct in your initial evaluation If you can now...

Page 11: ...of the DC RAIL FUSES e Please refer to the section RIGHT LEFT STEREO SPEAKER OUTPUT for further clarification A little known fact is that when any amplifier is operated in the bridged mode the load i...

Page 12: ...d their time current blowing points have been carefully selected and thoroughly tested to deliver optimal performance while still accomplishing their protective functions Replace these fuses individua...

Page 13: ...ts Its plug should be inserted in a standard 120V 60Hz outlet with a minimum capacity of 15amperes and should have a dedicated branch circuit It is not recommended that you connect the GFA 565 into a...

Page 14: ...g on the amplifier POWER LED does not glow a failed electronic component or other internal malfunction must be suspected Make no further attempts at fuse replacement or operation of the amplifier Refe...

Page 15: ...LED indicates that there is AC voltage being fed to the amplifier but it does not signify that all the amplifier s circuits are in operation If for example you have blown one or more of the DC RAIL FU...

Page 16: ...l to reduce the listening level demands or you may blow the DC RAIL FUSES cause the THERMAL PROTECTION to be activated or in extreme cases damage your loudspeakers THERMAL PROTECTION LED The GFA 565 i...

Page 17: ...ility The chassis top cover and rear panel are of heavy gauge steel both painted and baked If the front panel top or sides should become dusty or fingerprinted they can be cleaned with a soft Iintless...

Page 18: ...of purchase and the ADCOM authorized dealer from whom it was purchased In the event the unit must be returned for service you will be instructed as to the proper procedure when you call or write UNDER...

Page 19: ...05 THD 700 watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz at less than 0 1 THD bridged IM Distortion SMPTE 1 watt to 250 watts into 8 ohms 0 009 1 watt to 350 watts...

Page 20: ...10Hz to 20kHz 0 0 25dB Power Bandwidth 3dB 5 Hz to 100kHz Dynamic Headroom into 4 Ohms 2 5dB Signal to Noise Ratio A Weighted 250 watts into 8 ohms 110dB Gain 27 0dB Input Impedance 100 000 ohms Inpu...

Page 21: ...om logo are registered trademarks of Adcom LLC No part of this manual may be reproduced or electronically transmitted without the express written consent of Adcom LLC Adcom LLC shale not be liable for...

Page 22: ......

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