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Adcom GFA-7700 - page 1
GF A-7700 High Current 5-Channel Power Amplier Owner’ s Manual ...
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Adcom GFA-7700 - page 2
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Adcom GFA-7700 - page 3
• Precision-matched dev ices used throughout the signal path. • 120,000 µF of power supply-lter capacitance for greater reserve capacity . • Independent power supplies for each channel. • F ewer gain stages improve signal reproduction accur acy . • Custom toroidal power tr ansformer prov ides better regulation and greater peak current ...
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Adcom GFA-7700 - page 4
Introduction Congratulations on your decision to purchase the GF A-7700, 5-channel power amplier . The GF A-7700 integrates very well with any other home theater system, such as Dolby P roLogic ™ or Dolby Digital ™ . Y ou have made a wise choice that will reward you with exceptionally accurate and musical sound reproduction for years to come ...
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Adcom GFA-7700 - page 5
Description of Unit Rear P anel Inputs (1) The audio inputs for the GF A-7700 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 ve channels; Front L (Left), Center , Front R (Right), Surround L (Left), and Surround R (Right). T o insure t ...
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Adcom GFA-7700 - page 6
6 12VDC T riggering (4a) The GF A-7700 is a very high power amplier 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 of a pre-amplier . Usually this would mean that when you turn on/off your pre-ampli? ...
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Adcom GFA-7700 - page 7
Front P anel On/Off Switch (6) The On/Off Switch controls power to the power transformer and circuits of the GF A-7700. Whenever the GF A-7700 is energized the P ower LED (7) will glow . T o turn the GF A-7700 on, press the push-button. It will remain in the “engaged” position while the unit is energized. T o turn the GF A-7700 off, press the p ...
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Adcom GFA-7700 - page 8
8 Distortion Alert LEDs (8) The Dis tort ion Alert cir cuit is a un ique ADCO M di stor tion dete ctio n sy stem whic h re ads all form s of non- lin ear dist orti on su ch a s THD, IM, slew -ind uced , “c lippi ng,” etc . The D isto rtio n Aler t LE Ds w ill l ight whe n di stor tion reac hes appr oxim atel y 1% rega rdle ss o f im peda nce, v ...
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Adcom GFA-7700 - page 9
9 Installation & Hookup Unpacking the GF A-7700 Before your new GF A-7700 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 awless in bot ...
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Adcom GFA-7700 - page 10
10 Connecting the GF A-7700 R emember , that the Left and Right designations are as you are sitting down in your listening/viewing area. On the rear panel, the inputs and outputs are grouped in 5 bracketed sets, one for each channel. They are as follows: RS — Right Surround LS — Left Surround RF — Right Front C — Center LF — Left Front ...
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Adcom GFA-7700 - page 11
11 Inputs (1) T o preserve the correct effects, be certain to connect the RCA cables to the proper RCA-input connector . If the cables are color coded, then use this sequence for the connections: Blue ............................................................ Left Front R ed ........................................................... Right Front ...
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Adcom GFA-7700 - page 12
It is suggested that the three front channels follow this chart for speaker lengths and wire gauges. up to 24 feet ...................................... A WG16 up to 36 feet ...................................... A WG14 up to 58 feet ...................................... A WG12 Generally , for the two rear surround channels, longer runs of cable ...
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Adcom GFA-7700 - page 13
T roubleshooting Resolv ing Problems Use the chart below to solve common situations that don’t require professional attention. If the steps stated in POSSIBLE SOLUTION do not resolve your problem, then please contact your ADCOM Dealer or call the ADCOM Customer Service Department. Any problems not covered here should be brought to the attention o ...
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Adcom GFA-7700 - page 14
Serv icing ADCOM has a T echnical Service Department to answer questions pertinent to the installation and operation of your unit. In the event of difculty , please contact us for prompt advice. Please have the following information readily at hand: the unit’ s model and serial numbers, and dealer from whom it was purchased. If your problem ca ...
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Adcom GFA-7700 - page 15
GF A-7700 Specications THD + Noise into 8 ohms (T ypical) 20Hz ............................................................................................................... 0.006% 1kHz ............................................................................................................... 0.006% 10kHz ................................... ...
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Adcom GFA-7700 - page 16
8551 East Anderson Drive, Suite 105 Scottsdale, Arizona 85255 V oice: (480) 607-2277 Fax: (480) 348-9876 www .adcom.com gfa7700_manual_v1 ...
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