User manual ADCOM GFS-3

[. . . ] Our engineering team consistently strives to develop and design products that will exceed your expectations. Our goal at Adcom is to let more consumers hear high-end quality sound without paying high-end prices. All Adcom components are the result of a long-standing dedication to innovation, quality, simplicity, and value. Adcom: We have the power -- and now, so do you! AVERTISSEMENT DANGER D'ÉLECTROCUTION NE PAS OUVRIR WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK); NO USER-SERVICEABLE PARTS INSIDE;, REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. [. . . ] On the GFA-555se , the positive terminal is color coded RED and labeled "+", and the negative is color coded BLACK and labeled "-". 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. up to 24 feet AWGI6 up to 36 feet AWGI4 up to 58 feet AWGI2 STEREO/BRIDGED MONO INPUT/OUTPUT The GFA-555se can be used as a very powerful mono amplifier to drive 8-ohm impedance loudspeakers when in its "bridged" mode. No modification to the amplifier is necessary for operation in the bridged mode, nor are any additional accessories required. However, you will need two GFA-555ses for stereophonic reproduction, if you are using them in the bridged mono mode. 7 To set the amplifier in bridged mono operation, flip the STEREO/BRIDGED input switch into the BRIDGED position. When in the bridged mono mode, input to the amplifier is made only through the LEFT input jack. The connection to the RIGHT input jack should be removed since the right-channel input portion of the amplifier is inoperative. Only a single loudspeaker is to be connected to the GFA-555se when in the bridged mono mode. Please note that connections made to the loudspeaker from the GFA-555se, when used in the bridged mono mode, are different from those made when the amplifier is used in the stereo mode. The LEFT RED output binding-post terminal (labeled BRIDGED MONO OUTPUT "+") should be connected to the loudspeaker input terminal color-coded RED (or labeled POSITIVE, "+", POS, 8 OHMS or 4 OHMS). The RIGHT RED output binding post terminal on the amplifier (labeled BRIDGED MONO OUTPUT "-") should be connected to the BLACK loudspeaker terminal (or labeled NEG, "-", C, COM, COMMON, G, or GROUND). Please note that if you want to insure correct stereo phasing with optimal bass response, you must observe these connections precisely. (3AG) 314006/250V 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. Failure to observe this precaution may cause serious damage to the amplifier circuits, may create a hazard fire, and may void the warranty. If the Power LED (8) does not glow, it may be an indication that the AC fuse has blown. If you are not sure, or the amplifier displays other symptoms, please consult the RESOLVING PROBLEMS section on page 12. (2) Inputs (balanced) The audio inputs for the GFA-555se are through high-quality, Balanced XLR jacks to minimize high-frequency losses, noise, etc. They will accept standard XLR-type plugs, one for each channel; Left and Right. To insure that the performance designed into the amp is preserved, you should use the highest quality audio cables possible. (See CONNECTING THE GFA-555se for more information). Fuse replacement To remove the fuse-holder cap, you will need a #2 standard Phillips screwdriver. Place the screwdriver in the recessed "crosshead" in the cap. Turn the cap counter-clockwise, until the cap releases out towards you. Since the fuse has a ceramic body, you cannot visually examine the fuse element, it is therefore suggested that you replace it with an identical substitute or bring the fuse to your ADCOM dealer so they may check its integrity. [. . . ] Turn the amplifier on, if the hum still persists, then your Dealer or Service Center must examine the amplifier. 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 preamp or processor should be evaluated for proper operation by your Dealer or Authorized Service Center. 12 CARING FOR YOUR GFA-555se Great care has been taken by ADCOM to ensure 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. [. . . ]