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Manafacture: Adcom File size: 619.34 kb File name: gfa-5225-ug.pdf Language of manual:

Be sure to dip wires well away from the amplifier to avoid this possibility <§> INSTALLATION ADVISORY: The GFI-5200 Balanced Une driver needs to be pieced as close to the source unit as possible. The complete "Balanced Line System* will operate properly ONLY when the GFI-5200 is installed correctly. <$> OPERATION ADVISORY: Make sure the two sensitivity controls on the amplifiers are set fully clockwise. When matching the output of the source unit with the input of the amplifier, adjust the level controls on the GFI-5200 instead of the amplifier. <|> OPERATION ADVISORY: Even though Adcom amplifiers are capable of driving very low impedances, it is recommended that the configuration not be lower than 10 stereo, or 20 Mono. This will ensure that you receive optimum power and control, lowest distortion and greatest reliability. <|> OPERATION ADVISORY: If you are using this amplifier with a GFi-4600 crossover, then please see the “Connecting the GFI-4600“ section on page 8. Congratulations! Thank you for choosing ADCOM Car Audio components for your mobile audio needs. Your ADCOM Car Audio Balanced Amplifier System- uses superior engineering principles and the highest quality components to provide a musical experience with clarity and dynamics never before achieved in a vehicle. PLEASE read this manual entirely before attempting to install this system. Due to the sophisticated nature of this equipment, we highly recommend an authorized ADCOM Car Audio Dealer perform the installation to achieve the maximum performance from your mobile sound system) Your warranty is affected if you choose to install your ADCOM amplifier yourself. You will receive all the benefits of the limited warranty only if the amplifier Is professionally installed by an authorized ADCOM Car Audio Dealerl Please refer to your warranty card for details. . TABLE OF CONTENTS; THE BALANCED CONCEPT, CARTON CONTENTS___________ UNPACKING_________________________ CARE AND CLEANING......... FAN AND LED OPERATION. MOUNTING 2 2 2 3 3 The Amplifiers 3 3 The Balanced Line Driver CONNECTING THE POWER The Amplifiers, 4 4 5 6 7 The Balanced Une Driver....... INPUT SENSITIVITY SETTINGS, SPEAKER CONNECTIONS......... UNBALANCED OPERATION...... CONNECTING THE SYSTEM Connecting the GFI-4600 Crossover ..8 ..8 ..9 10 11 12 13 14 Connecting Other Brands of Balanced Equipment.............. DIAGRAM 9: Multi-Amp system with a GFI-4600 and GFY-2B DIAGRAM 10: Multi-Amp system with Dual GFI-4600’s........... TROUBLESHOOTING.............................................................. SPECIFICATIONS.................................................................... ADAPTER CABLES.................................................................. SERVICING.............................................................................. THE BALANCED CONCEPT: The advantage of a balanced line system >g simóle: Noise reduction. Any noise that is induced into the signal path is automatically canceled at the input of the amplifier. Therefore, induced noise is no longer a problem or concern for car audio installers. In order to have a "balanced" system, you need 3 items: 1: a Balanced Une Driver (GFI-5200). 2; a Balanced-type Cable (two pairs of RCA cables). 3: a Balanced Amplifier (GFA-5225, GFA-5250 or GFA-5275). .. If we follow the signal from the source (CO, Tape deck), to the amp, we can see exactly how a Balanced line System works. As the signal exits the source unit, H is converted to a balanced signal by the GFI-5200. It is then transmitted through the cables (two pairs of RCA cables) to the balanced amplifier. If, while the signal Is being transmitted, K picks up.any induced noise, it will travel the original signal to the input of the amplifier. The amplifier's differential input will ignore the noise that was added, and only amplify the original signal. CARTON CONTENTS: The Adcom GFA-5225, GFA-5250 and GFA-5275 amplifiers are shipped from the factory with the GFI-5200 2-channel Balanced Une Driver. Also included with your Balanced System is a fuse holder with an appropriately sized fuse. For proper connection of the fuse, see the CONNECTING POWER section. There should also be a Warranty Registration card included. Fill this out and drop it in the mail; there is no postage needed. Even though you send in-the Warranty card, you should always keep your original sales receipt for proof of purchase date. UNPACKING: Be sure to verify that the serial number printed on the bottom of the amplifier is the same as the serial number on the carton. If either number is missing or altered, you should contact ADCOM immediately at (908). 390-1130. Before each ADCOM Car Amplifier System leaves our facility-in New Jersey, it is carefully inspected for physical imperfections and electrical performance as a routine part of ADCOM's Quality Assurance system. This is to ensure flawless performance- and appearance when you receive It Afte...

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