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| ADCOM GFA-6006/02 Owner’s Manual10
11ADCOM GFA-6006/02 Owner’s Manual |
and labeled “+,” and the negative is
color coded BLACK and labeled “-”. The
positive terminal on the speaker will be
color coded RED, or will be labeled
“+,” “pos,” “positive,” “8 ohms,” or “4
ohms.” The negative terminal on the
speaker will be color coded BLACK, or
will be labeled “-,” “neg,” negative,”
“C,” “Common,” “G,” or “ground.”
Note: Bridged operation requires different
loudspeaker connections. For details see
the section Bridged Operation.
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Bridged Operation
In bridged operation the output of
two stereo amplier channels are
“combined” to drive one monophonic
speaker. In the bridged mode the
GFA-6002 and 6006 wattage capability
increases to 175 Watts at 8 ohms
per bridged channel. The GFA-6006
allows for any of three adjoining
“pairs” of ampliers to be bridged.
For input directions see the section
Audio Signal Inputs and Outputs. To
engage bridged operation for a pair
of amplier channels, switch the
corresponding toggle switch to the
bridged position. In bridged operation
the proper loudspeaker connection is
to the POSITIVE (+) terminals of each
of the pair of bridged channels. Do
Not connect the Negative (-) speaker
terminals under any circumstances in
the bridged mode.
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3-30V AC/DC Triggering
The GFA-6002 and GFA-6006 are very
high power ampliers and as such must
be directly connected to the wall outlet
or an appropriate surge protector or
AC line conditioner. It must never be
connected to the “switched” outlets
on the rear panel of a pre-amplier.
Usually, this would mean that when
you turn on/off your pre-amplier you
would have to turn on/off your power
amplier separately. We have, however,
provided the ability to control the
OFF/ON function (actually “powering
up” from standby) of the amplier by
a 12-Volt DC output jack on the rear
of certain ADCOM pre-ampliers and
tuner pre-ampliers. When using this
feature the rear panel Power Switch
must be left in the in “auto” position.
To connect, you will need a mono-mini
phone plug to a mono-mini phone
plug cable of appropriate length (not
included) to reach from the rear panel
jack of the amplier to the rear panel
of the pre-amplier. Contact your
dealer for information on using this
feature with ADCOM and other brand
pre-ampliers. Although 12V DC is
optimal, the circuit will operate from
approximately 3 to 30V AC or DC, not to
exceed 250mA. The center conductor
(tip) is positive. When using the 3-30V
AC/DC triggering method the unit will
return to standby approximately two
and one half minutes after the signal is
no longer present.
Audio Signal Sensing
Alternately, the sensing of audio signal
can turn on the 6002/6006 amplier.
Any time the amplier detects the
presence of an incoming audio signal
it will “power up” from standby. Please
note that the speed of “turn on” by
AC/DC triggering and audio sensing is
different. AC/DC triggering is slightly
faster. When using the signal sensing
method, the unit will return to standby
approximately two and one half minutes
after the signal is no longer present.
An incoming signal level of 5-7 mV is
required to trigger this sensing method.
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AC Fuse
The AC Fuse protects the electronic
circuits of the GFA-6002/6006. This
fuse, normally, will fail only if there is
an overload within the GFA-6002/6006.
It may, however, fail if the amplier
attempts to deliver very high power
into very low-impedance loudspeakers.
In either case, BE SURE TO REPLACE
THE AC FUSE ONLY WITH AN EXACT
REPLACEMENT FUSE.