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OUTPUT "+") should be connected to the loudspeaker input terminal color-coded RED (or
labeled POSITIVE, "+", POS, 8 OHMS or 4 OHMS). The RIGHT RED output binding post
terminal on the amplifier (labeled BRIDGED MONO OUTPUT "-") should be connected to
the BLACK loudspeaker terminal (or labeled NEG, "-", C, COM, COMMON, G, or GROUND).
All the wiring and phasing recommendations in the section RIGHT/LEFT STEREO
SPEAKER OUTPUT 8 apply to this connection as well. Please note that if you want to insure
correct stereo phasing with optimal bass response, you must observe these connections
precisely.
Although the GFA-565 can generate a substantially greater amount of power in the bridged
mono mode than when it is in its normal stereo mode, it requires the use of loudspeakers the
nominal impedance of which does not drop below 4 ohms. It is not recommended that the
GFA-565 be used in the bridged mono mode into loudspeakers, or multiple loudspeaker
loads, which drop in value substantially below 4 ohms. Otherwise, you may trigger the
THERMAL PROTECTION 0 or blow one of the DC RAIL FUSES e. Please refer to the
section RIGHT/LEFT STEREO SPEAKER OUTPUT for further clarification. A little known
fact is that when any amplifier is operated in the bridged mode, the load is "split" between
the two amplifiers in the bridged configuration. Therefore, an 8-ohm loudspeaker will be
seen by the amplifier as if it were a 4-ohm load; a 4-ohm loudspeaker load will be seen by
the amplifier as a 2-ohm load.
If the connections described above are followed exactly, the GFA-565 will be polarity
correct, that is, it will not invert "phase". Any positive-going signal at its input will appear
as a positive-going signal at the loudspeaker.
DC RAIL FUSES
The DC RAIL FUSES provide protection for the output stages and power supply in the event
of excessive current demands from the amplifier, either long-term or short-term.
If the amplifier ceases to operate, either on one or both channels, particularly during
high-level passages, or long-term high-volume playback, and the POWER LED glows while
the THERMAL PROTECTION LED is out, the chances are that one or both of the DC RAIL
FUSES on that channel, or both channels, are blown.
Your ADCOM amplifier is designed to activate its protective devices reliably, particularly
NOTE
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