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INSTALLING THE GFA-555ms
The GFA-555ms is equipped with large heatsinks to dissipate the heat generated by the
output power transistors. Although during normal home operation the heatsinks will become
just warm to the touch, there are instances during high-level playback into low impedance
speakers which will cause the heatsinks to become much warmer than normal. Therefore,
adequate air circulation MUST be made available to ensure proper heat dissipation
from the heatsinks. You will ensure the amplifier's long-term, trouble-free operation if you
keep it away from external sources of heat, such as radiators, hot-air ducts or intense direct
sunlight, and provide reasonable ventilation. The GFA-555ms should never be placed with
other heat-producing components in a cabinet or enclosure lacking free air flow. You should
also provide adequate space around the amplifier to insure good air circulation.
The top, bottom and side panels of the amplifier have been provided with slots to allow
necessary cooling of the internal components of the amplifier. This GFA-555ms Required
Four Inches of Clearance on the Top and All Sides. You should ensure that these slots
are not obstructed in any way.
We advise that you refrain from stacking other components on top of the GFA-555ms. Not
only will the heat generated by the amplifier affect the performance of equipment stacked on
top of the GFA-555ms, but the free flow of air through the ventilating slots provided in the
chassis of the amplifier may be partially obstructed. If you require that the GFA-555ms be
mounted in an enclosed cabinet, it is recommended that the rear panel of the cabinet be
provided with vents or slots at the bottom and top to allow air to circulate freely through the
cabinet.
If you observe these recommendations, the GFA-555ms will perform quite reliably in any
reasonable environment. You should also pay attention to such routine considerations as
protection from excessive dust and moisture. Occasional vacuuming of accumulated dust on
the surfaces of the chassis, panels and heatsinks should be all that is required.
For use in professional installations, the GFA-555ms may be mounted in a standard 19-inch
rack using the optional RM-7 rack-mount adaptors available through ADCOM dealers. If the
GFA-555ms is to be mounted on a rack, along with other components which are
interconnected to the GFA-555ms, the amplifier's chassis must be insulated from the
metal-rack rails to prevent ground loops, especially if the rack is grounded to "earth", and to
avoid defeating the audio grounding scheme of the power amplifier (the audio-input grounds
are isolated from and above the chassis ground). Please consult the instruction sheet