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Anleitung Zusammenfassung
Brunswick, NJ 08816 (908) 390-1130 GFA-55S PRO AMPLIFIER OWNERS MANUAL WELCOME It is very important that you read this owners manual thoroughly before turning on your ADCOM GFA-555 Power Amplifier. Your ADCOM GFA-555 represents the most advanced flunking in audio amplifier design. At 200 watts per channel, the GFA-555 offers an exceptional value; superior performance at a reasonable price. Some of the outstanding features of this product are: — 200 Watts per Channel, 20Hz - 20KHz, into an 8 ohm load with both channels driven less than 0.09% Total Harmonic Distortion. — 325 Watts per Channel, 20Hz - 20KHz, into a 4 ohm load with both channels driven with less than 0.25% Total Harmonic Distortion. — The ability to drive very low impedance loads. — Bridged mode power of 600 watts, 20Hz - 20 KHz, into an 8 ohm load with less than 0.25% Total Harmonic Distortion. — Instantaneous Distortion Alert which indicates when distortion products are above the 1% level. — Power supply circuit breakers for overload protection. — Provisions for both Balanced and Unbalanced input signals. This manual has been written to anticipate the kind of questions you may encounter while enjoying your GFA-555 power amplifier. Please read it thoroughly to fully understand all of the features offered and how they can be used to maximize the performance of your audio system. \ SECTION 1 WHAT TO DO WHEN YOU OPEN THE BOX Before each GFA-555 left the factory, it was carefully inspected for physical imperfections as a routine part of ADCQM’s systematic quality control. This along with full electrical testing, should insure a product flawless in both appearance and performance. After you have unpacked the amplifier, inspect it for physical damage. Save the shipping carton and all packing materials as they are essential to reduce to a minimum the possibility of transportation damage should the product ever need to be shipped again. In the unlikely event that damage has occurred, notify your dealer immediately and request the name of the carrier so that a written claim to cover shipping damage can be initiated. THE RIGHT TO ANY CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NOT NOTIFIED PROMPTLY AND IF THE SHIPPING CARTON AND PACKING MATERIAL ARE NOT AVAILABLE FOR INSPECTION. SAVE ALL PACKING MATERIALS UNTIL THE CLAIM HAS BEEN SETTLED. SECTION 2 WHERE TO PUT IT (AND WHERE NOT TO!) The GFA-555 utilizes large external heat sinks to dissipate heat from the power transistors. The top and bottom panels of the amplifier have slots to allow air to circulate inside the amplifier. Adequate dr circulation must be available to ensure cool operation of the amplifier. Therefore, the GFA-555 should not be completely enclosed with other heat producing components, and adequate space around the amplifier should be maintained. We recommend at least 3 inches on the top and 1 inch on the sides and rear for air circulation. If the GFA-555 is going to be mounted in an enclosed cabinet, it is recommended that the back of the cabinet have vents to allow air to circulate around the amplifier. With these considerations in mind, the GFA-555 should perform quite happily in any reasonable environment. Of course, such normal considerations as protection from excessive dust and moisture should always be observed. The ADCOM GFA-555 power amplifier has been carefully designed with high quality components so that long term undiminished performance may be expected from the amp when it is operated in accordance with the instructions provided. -2- SECTION 3 WHERE (AND HOW) ALL THE WIRES GO All connections are conveniently located on the rear panel of the GFA-555 PRO. Any suitable program sourcefsuch as a control preamplifier or mixing board may be used. ALL CONNECTIONS MUST BE MADE WITH THE AMPLIFIER UNPLUGGED AND THE AC POWER SWITCH OFF. Inputs are provided for both Balanced and Unbalanced input signals. There is a selector switch on the rear panel of the amplifier for Balanced and Unbalanced Input selection. The jacks provided for Unbalanced input signals are standard 2 conductor 1/4 inch phone type. The jacks provided for the Balanced input signals are for XLR connectors. Input signal attenuators are provided for matching left and right signal levels. These attenuators are mounted on the front panel for your convenience. The Output terminals on the GFA-555 are the standard 5-way binding posts. The output terminals are spaced to permit the use of the so called “Banana Plugs” when using the amplifier as a stereo unit. When connecting speakers to the GFA-555, you should always use the largest wire size (lowest gauge number) that is available to you. We recommend at least 16 puge, 2-conductor cord (zip cord) for distances up to 25 feet. For distance up to 50 feet, 14 gauge wire should be used. You may also wish to consider some of the commercially available speaker cables which have been designed to improve the connection between the powe...