Official Manual for Adcom GFA 7805 Multichannel Power Amplifier

INTRODUCTION

Congratulations on your decision to purchase the GFA-7805 or GFA-7807 multichannel power amplifier. The GFA-7805 and GFA-7807 have been designed to be high performance and musically accurate in a configuration specifically designed to integrate with any audio pre-amplifier. You have made a wise choice that will reward you for years to come with exceptionally accurate and musical sound reproduction. To realize the full potential of your new amplifier, and before making any connections to it, please read these operating and installation instructions thoroughly.

UNPACKING THE GFA-7805/7807

Before your new ADCOM amplifier left our factory, it was carefully inspected for physical imperfections and tested for all electrical parameters as a routine part of ADCOM’s systematic quality control. This, along with full operational and mechanical testing, should ensure a product flawless in both appearance and performance. After you have unpacked the GFA-7805/07, inspect it for physical damage. Save the shipping carton and all packing material as they are intended to reduce the possibility of transportation damage should the amplifier ever need to be shipped again. In the unlikely event damage has occurred, notify your dealer immediately and request the name of the carrier so a written claim to cover shipping damages can be initiated. THE RIGHT TO A CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NOT NOTIFIED PROMPTLY IN WRITING AND IF THE SHIPPING CARTON AND PACKING MATERIALS ARE NOT AVAILABLE FOR INSPECTION BY THE CARRIER. SAVE ALL PACKING MATERIALS UNTIL THE CLAIM HAS BEEN SETTLED.

INSTALLING THE GFA-7805/7807

During normal home operation the internal heatsinks of the GFA-7805/7807 may become warm. However, there are instances during high-level playback into low impedances when the heatsinks will become much warmer than usual. To ensure the amplifier’s long-term, trouble-free operation it is necessary to provide adequate ventilation for the heatsinks. Therefore, the GFA-7805/7807 should be kept away from external sources of heat such as radiators and hot-air ducts. The GFA-7805/7807 should never be placed with other heat-producing components in a cabinet or enclosure lacking free air flow. The top and bottom panel of the amplifier’s chassis have been provided with vents to allow the necessary cooling of the internal components. It is imperative that these vents are not obstructed in any way.

We recommend that you do not stack other components on top of the GFA-7805/7807. This is particularly important if your system includes low-impedance loudspeakers which are difficult to drive, or if you will consistently demand high volume levels from the amplifier and speaker system. Not only will heat generated by the amplifier affect the performance of equipment stacked on top of the GFA-7805/7807, but the free flow of air through the ventilating slots in the amplifier may be partially obstructed.

If you observe these recommendations, the GFA-7805/7807 will perform reliably in any reasonable environment. You should also pay attention to such normal considerations as protection from excessive dust and moisture. Occasional vacuuming of accumulated dust on the chassis, panels and around the ventilating slots should be all that is required.

The optimal performance of your new GFA-7805/7807 will ultimately depend on the care with which you make the connections between the amplifier, pre-amplifier, surround sound decoder and the loudspeakers. All input and output signal connections should be made only with high quality, low-loss, low capacitance cables following the recommendations in the Inputs and Outputs section of CONNECTING THE GFA-7805/7807.

GFA7807 specifications

The Adcom GFA-7807 is a high-performance power amplifier known for its exceptional sound quality and engineering. As part of Adcom's renowned lineup of audio equipment, the GFA-7807 is celebrated for its ability to deliver powerful and accurate audio reproduction, appealing to audiophiles and casual listeners alike.

One of the standout features of the GFA-7807 is its impressive power output. It provides 200 watts per channel at 8 ohms and can deliver up to 350 watts per channel at 4 ohms. This robust power handling allows it to drive even the most demanding speakers with ease, ensuring that the music remains dynamic and detailed, regardless of the volume level. This amplifier's ability to maintain its performance under high loads is a crucial attribute for high-end audio setups.

The GFA-7807 employs a Class AB amplification design, which balances the benefits of both Class A and Class B amplifiers. This design helps minimize distortion and crossover issues, ensuring that the output remains clean and precise, particularly in the midrange frequencies. The amplifier's low total harmonic distortion (THD) rating further enhances its audio fidelity, making it an excellent choice for critical listening.

In terms of build quality, the Adcom GFA-7807 is constructed with rugged components designed to withstand the rigors of prolonged use. The sturdy chassis and high-quality connectors contribute to its durability, while also minimizing interference and maintaining signal integrity. The amplifier is also equipped with extensive protection circuits, which guard against short circuits, thermal overload, and other potential damage conditions.

Another noteworthy characteristic of the GFA-7807 is its versatility. It features multiple input options, including balanced XLR and unbalanced RCA connectors, allowing for seamless integration into various audio systems. Additionally, its rack-mountable design makes it an ideal choice for professional setups and home theaters alike.

Overall, the Adcom GFA-7807 power amplifier stands out in the audio landscape due to its impressive power handling, low distortion, rugged construction, and versatility. Whether used in a high-fidelity music system or a home theater, it delivers a remarkable listening experience that captures the essence of the original recording, making it a must-consider option for enthusiasts looking to elevate their audio setups.