User manual ADCOM GFA-6006

[. . . ] GFA-6002 & GFA-6006 Custom Install Power Amplifiers ch 1 distorti on alert < on / standb y therma l protect ion > > ch 2 ch 3 ch 4 ch 5 ch 6 G F A 60 06 ADCOM GFA-6006/02 Owner's Manual | 1 WELCOME Dear Fellow ADCOM Product Owner, Welcome to the ADCOM family!For more than twenty years, ADCOM products have delivered excellent performance and value for customers around the world. Our products are designed by our experienced and demanding engineering team, built to the highest standards in our factory, and sold and serviced through dealers, custom installers, and other retailers whose primary goal is your complete satisfaction. We know you are anxious to hear your new power amplifier in action, but please take a few minutes to read this owner's manual before connecting the power amplifier to your system. [. . . ] The LED will glow red whenever the rear panel power switch is in the ON and the GFA-6006/6002 is energized. The Power LED indicates that there is AC voltage being fed to the amplifier, but it does not signify that the entire amplifier's circuits are in operation. this would indicate that the thermostat within the transformer has opened. Once the temperature within the transformer decreases to a normal level, the thermostat will reset itself automatically and normal operation will resume. If you are to avoid continually tripping the thermostat in the transformer, you must reduce the sound level demands, correct the load impedance of the loudspeakers, or both. been over-driven or that the load the loudspeakers are presenting to the amplifier is unreasonably low. If you wish to prevent recurrent activation of the thermal protection circuitry, you must reduce the volume-level demands or correct the load impedance condition which may be causing activation of this circuitry. [3] Distortion Alert The Distortion Alert circuit is a unique ADCOM distortion detection system which reads all forms of non-linear distortion such as THD, IM, slew-induced, "clipping, " etc. The Distortion Alert LEDs will light when distortion reaches approximately 1% regardless of impedance, voltage/ current phase angle or the reactance of the loudspeakers which the amplifier is driving. Sometimes, when the amplifier is in use, the LEDs may occasionally flicker during high volume listening, particularly if you are driving [2] Thermal Protection The GFA-6002/6006 are provided with a thermal protection circuit which will shut down the individual amplifiers if its heatsink temperature reaches 85°C. The Thermal Protection LEDs will light whenever the thermal protection circuit in its respective channel has been triggered and the amplifier is inoperative. The thermal protection circuitry will typically be triggered by very high power demands into impedances much lower than the amplifier is capable of driving 1 If, for example, one of the Thermal Protection LEDs glows, that amplifier channel will not produce sound even though the Power LED may still glow. Additionally, the internal power transformer is provided with a thermostat which will interrupt power into the transformer if its temperature exceeds 125°C. This high temperature will seldom, if ever, be encountered unless the amplifier is subjected to abnormal conditions, such as operation into loads of less than 3 ohms at very high listening levels. If the AC Fuse has not failed, the Power LED is out, and the Thermal Protection LED does not glow, 2 3 low impedances. The LEDs are simply warning you that the amplifier is approaching its maximum power output into the particular loudspeakers you are using. If, however, the Distortion Alert LEDs glow brightly or are illuminated most of the time during playback, you are over driving the amplifier and should turn down your volume control to reduce the listening level. Otherwise, it may cause the Thermal Protection to be activated or, in extreme cases, damage your loudspeakers. at those levels. If any amplifier channel's output through the loudspeaker(s) ceases abruptly and its Thermal Protection LED glows, you will know that its heatsink temperature has become unacceptably high and the circuitry is protecting the amplification devices. Please note that the Power LED will remain on and the amplifier will still be energized. Once the temperature of the heatsink(s) drops to a safe operating level, that amplifier will automatically resume operation. Activation of the Thermal Protection circuitry in any of the channels of amplification in the GFA-6002/6006 is an indication that the amplifier has 8 | ADCOM GFA-6006/02 Owner's Manual GFA-6006 Rear Panel 4 GFA-6002 Rear Panel 8 5 6 7 9 10 11 1 Description of Unit: Rear Panel [4] Inputs & [5] Outputs The audio inputs and outputs for the GFA-6002 and GFA-6006 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 channels. To insure that the performance designed into the amplifier is preserved, you should use the highest quality audio cables possible. The GFA-6002 and 6006 feature inputs and outputs for each channel to allow "daisy-chaining" of channels or additional amplifiers in an installation. [. . . ] Warranty coverage for products purchased and used outside of the United States is provided by local ADCOM authorized distributors. (5) Charges by third parties for set-up, installation, adjustments, shipment, insurance, and other charges are not covered by this warranty. (6) This warranty extends only to defects in material or workmanship as limited above and does not extend to any product or part which has been lost or discarded by you or to damage to products or parts caused by misuse, accident, Acts of God such as lightning or fluctuations in electrical power, improper installation, improper maintenance or use in violation of instructions provided in this Owner's Manual, or to products which have been altered or modified. This warranty does not extend to products which have had the serial number removed, altered, defaced, or rendered illegible. [. . . ]