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Table of Contents
Related Manuals for Adcom GFA-7700
Summary of Contents for Adcom GFA-7700
- Page 1 GFA-7700 High Current 5-Channel Power Amplifier Owner’s Manual...
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Page 3: Table Of Contents
Description of Unit Rear Panel... 5 Front Panel... 7 Installation & Hookup Unpacking the GFA-7700 ... 9 Placement of the GFA-7700 ... 9 Quick Connection Diagram ... 10 Connecting the GFA-7700 ... 11 Caring for your GFA-7700 ... 12 Troubleshooting Resolving Problems ... -
Page 4: Introduction
ADCOM product which has not been opened, mishandled, or tampered with in any way. Always retain your original sales receipt as a proof of purchase. -
Page 5: Description Of Unit Rear Panel
Rear Panel Inputs (1) The audio inputs for the GFA-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 five channels; Front L (Left), Center, Front R (Right), Surround L (Left), and Surround R (Right). To insure that the performance designed into the GFA-7700 is preserved, you should use the highest quality audio cables possible. - Page 6 12VDC Triggering (4a) The GFA-7700 is a very high power amplifier 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-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.
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Page 7: Front Panel
Power LED may still glow. When the GFA-7700 is turned off, the Power LED will take some time to fade out completely. It may take up to 30 seconds to fully extinguish. - Page 8 Activation of the Thermal Protection circuitry in any of the amplifiers in the GFA-7700 is an indication that the amplifier has been over driven or that the load the loudspeakers are presenting to the amplifier is unreasonably low.
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Page 9: Installation & Hookup Unpacking The Gfa-7700
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-7700. Not only will heat generated by the amplifier affect the performance of equipment stacked on top of the GFA-7700, but the free flow of air through the ventilating slots in the amplifier may be partially obstructed. -
Page 10: Quick Connection Diagram
Connecting the GFA-7700 Remember, 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 —... - Page 11 Contact your dealer to locate a DB-25 signal cable. Outputs (2) NOTE: The GFA-7700 is “polarity correct”. That is it does not invert phase from input to output. Any positive signals at its inputs will appear as a positive signal at its outputs In connecting the amplifier to the loudspeaker, it is vital to maintain proper polarity (positive to positive, negative to negative).
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Page 12: Caring For Your Gfa-7700
72 feet... AWG14 up to 116 feet ... AWG12 If longer runs are needed, it is best to consult with your Adcom Dealer to maximize the performance of your system with your exact conditions. All loudspeakers having a nominal impedance down to 4 ohms can be connected to and driven by the GFA-7700. -
Page 13: Troubleshooting Resolving Problems
“75Ω Ground Loop Isolator” before reconnecting the line. You should check with your ADCOM Dealer to obtain one. If the “75Ω Ground Loop Isolator” works only partially or not at all, then please read Note 2 to complete the troubleshooting procedure. -
Page 14: Service Information
For fax inquires, please include a return fax or voice number for the reply. When calling or writing about your GFA-7700, 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 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. -
Page 15: Specifications
GFA-7700 Specifications THD + Noise into 8 ohms (Typical) 20Hz 1kHz 10kHz 20kHz Frequency Response @ 1 Watt into 8 ohms (10Hz to 20kHz) Power Bandwidth (-3dB) Power Rating (EIA/CEA-490-A) 185 Watts continuous power into 8 ohms at 1kHz at less than 1.0% THD + N... - Page 16 8551 East Anderson Drive, Suite 105 Scottsdale, Arizona 85255 Voice: (480) 607-2277 Fax: (480) 348-9876 www.adcom.com gfa7700_manual_v1...
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