Adcom GFA-7705 User Manual

WARNING
Whenever connections to or from the GFA-7705/07 are being made, be certain that the AC On/Off Switch
(5) of the amplifier is in the OFF position, the AC Power Cord (4) of the amplifier is disconnected from the
AC wall outlet and that all associated components are turned off.
Installation & Hookup
Unpacking the GFA-7705/07
Before your new GFA-7705/07 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-7705/07 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.
Placement of the GFA-7705/07
During normal home operation the internal heatsinks of the GFA-7705/07 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-7705/07 should be kept away from external
sources of heat such as radiators and hot-air ducts. The GFA-7705/07 should never be placed with other
heat-producing components in a cabinet or enclosure lacking free air flow. The top and bottom panels
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-7705/07. Not only will heat
generated by the amplifier affect the performance of equipment stacked on top of the GFA-7705/07,
but the free flow of air through the ventilating slots in the amplifier may be partially obstructed. This is
particularly important if your system includes low-impedance loudspeakers which are difficult to drive, or
you will consistently demand high volume levels from the amplifier and speaker system.
If you observe these recommendations, the GFA-7705/07 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-7705/07 will ultimately depend on the care with which you
make the connections between the amplifier, preamplifier, surround sound decoder and the loudspeakers.
All input and output signal connections should be made only with high quality, low capacitance, shielded
cables following the recommendations in the Inputs and Outputs section of CONNECTING THE GFA-7705/07.
Quick Connections
For those of you who are in a hurry to hook up your amplifier into your system, we have included this
quick-connection section. The wiring is straight forward and expeditious if you use the proper cables
and follow this diagram exactly. If you have any difficulties or questions, please refer to the appropriate
section of this manual for complete descriptions and instructions.
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Adcom GFA-7705 Specifications

Power

power rating into 8 ohms	200 Watts continuous average power per channel
power rating into 4 ohms	300 Watts continuous average power per channel
power consumption idle 7 channel	120W

Audio Performance

frequency response at 1 watt into 8 ohms	+0, -0.22dB
power bandwidth	3 Hz to 130kHz
dynamic headroom into 4 ohms	1.90 dB

Electrical Specifications

input sensitivity for 1 watt output	0.1 volts
input sensitivity for 200 watts output	1.40 volts
damping factor (20Hz to 20kHz)	800

Dimensions and Weight

chassis dimensions	8.5” (216mm) x 17” (432mm) x 17.5” (444.5mm)
maximum dimensions	9 3/8” (238mm) x 17” (432mm) x 18.5” (470mm)
unit weight GFA-7707	35.5 kg