Adcom GFA7807 ユーザーズマニュアル
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.
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.
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.
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.
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.
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.
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.
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