Related Manuals for Adcom GFA-565se
Summary of Contents for Adcom GFA-565se
- Page 1 HIGH CURRENT POWER AMPLIFIER GFA-565 The contents of this manual are subject to change. Please check our website www.adcom.com www.adcom-usa.com for the most current version. Copyright © 2011 Adcom LLC...
- Page 2 In order to determine the performance of the GFA-565, ADCOM developed a "computer model" of a "difficult" loudspeaker load. A computer model "mimics" the reactance of the very difficult speaker and duplicates the actual phase angles of the voltage and current throughout the entire audio range.
- Page 3 without repetitive destruction of the loudspeaker load. To achieve the above, sets of specially selected TO-3-type, metal-cased bipolar output transistors are used in the GFA-565 in a triple-Darlington configuration of its driver and output stages. The safe operating area of these transistors, along with their circuit topology, insures very efficient power delivery to reactive loads, regardless of the phase angle of voltage and current.
- Page 4 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 with in any way.
- Page 5 For use in professional installations, the GFA-565 may be mounted in a standard 19-inch rack using the optional rack-mount adaptors available through ADCOM dealers. If the GFA-565 is to be mounted on a rack, along with other components which are interconnected to the GFA-565, the amplifier's chassis must be insulated from the metal-rack rails to prevent ground loops, especially if the rack is grounded to "earth", and to avoid defeating the...
- Page 6 LEFT and RIGHT. To insure that the performance designed into the GFA-565 is preserved, you should use the highest quality plugs and cable as are feasible. There are many cables specifically designed for this application. Your ADCOM dealer can help select the best cable for your needs.
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Page 7: Stereo/Bridged Mono Input/Output
"ridge" molded on the insulation on one of the conductors, while others are marked with a "+" and/or "_". Your ADCOM dealer also sells special loudspeaker interconnecting cables and these are most often labeled with respect to polarity. - Page 8 Generally speaking, when making connections to the loudspeakers from the amplifier, it is very important to use the correct type and size of wire in order to avoid unnecessary loss of amplifier power in the cable, reduction of amplifier damping factor (DF) and other undesirable conditions.
- Page 9 Alternatively, and for convenient switching of multiple sets of speakers with impedance protection for the amplifier, you may consider the use of an ADCOM speaker selector. These are available from your ADCOM dealer.
- Page 10 Should you wish to verify that your loudspeakers are in-phase, once connections to the amplifier have been made, play a recording of solo voice with single-instrument accompaniment, at normal volume, with the preamplifier's mode switch in the mono or A+B position.
- Page 11 POWER LED glows while the THERMAL PROTECTION LED is out, the chances are that one or both of the DC RAIL FUSES on that channel, or both channels, are blown. Your ADCOM amplifier is designed to activate its protective devices reliably, particularly...
- Page 12 The preceding is particularly true of amplifiers which have extremely wide audio bandwidth, such as ADCOM amplifiers. Among the undertakings which must be avoided, if damage to the amplifier or to...
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Page 13: Ac Line Cord
DC RAIL FUSES BUSSMAN AGC-8/250V LITTELFUSE 3AG312008/250V 3AG 8A/125V To remove a blown or suspect fuse from its fuse holder, use only a number 2 Phillips screwdriver to prevent damage to the fuse holder. Simply press lightly on the fuse-holder cap and turn counterclockwise. -
Page 14: Ac Line Fuses
(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. Refer the problem to competent ADCOM-authorized service personnel. -
Page 15: Ac On/Off Switch
cap and turn counterclockwise. The cap will "pop" out after several turns. To replace the fuse-holder cap, once the fuse has been replaced and properly installed in its seat on the fuse-holder cap, press lightly inward, once the fuse and cap have been inserted in the fuse-holder body, and turn the cap clockwise until it is firmly seated in the fuse-holder body. - Page 16 ALERT circuit unique ADCOM distortion-detection system which reads all forms of non-linear distortion such as THD, IM, slew-induced, "clipping", etc. The INSTANTANEOUS DISTORTION ALERT LEDs will light when distortion reaches 1% regardless of the impedance or the phase angle of the current voltage and the reactance of the loudspeakers which the amplifier is driving.
- Page 17 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.
- Page 18 When calling or writing about your GFA-565, be sure to note and refer to its model and serial numbers as well as the date 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.
- Page 19 GFA-565 SPECIFICATIONS Power Rating (To FTC Requirements) 250 watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0.04% THD. 350 watts continuous average power into 4 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0.05% THD.·...
- Page 20 ≦0.05% 1 watt to 700 watts into 8 ohms IM Distortion, Bridged (CCIF, Any Combination from 4kHz to 20kHz) ≦0.005% 700 watts into 8 ohms THD + Noise at 400 Watts into 8 Ohms, Bridged 20Hz 0.001% 1kHz 0.004% 10kHz 0.020% 20kHz 0.040%...
- Page 21 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 any errors contained herein or for any damages arising out of or related to this document or the information contained herein, even if Adcom LLC has been advised of the possibility of such damages.