10
OUTPUT "+") should be connected to the loudspeaker input terminal color-coded RED (or
labeled POSITIVE, "+", POS, 8 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).
Although the GFA-575se 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-575se be used in the bridged mono mode into loudspeakers, or
multiple loudspeaker loads, which drop in value substantially below 8 ohms. Otherwise, you
may trigger the THERMAL PROTECTION or blow one of the AC RAIL FUSES. 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-575se 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.
AC RAIL FUSES
The AC 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 AC RAIL
FUSES on that channel, or both channels, are blown.
If the current drawn by this stage exceeds a safe level due to a load impedance below 1 ohm
or short circuit at the speaker terminals, the LIMIT PROTECTION LED glows, it means the
output relay will open immediately to prevent the output transistor or other parts from failing.
To Next Page
Loading...
Need help?
General