Installing & Connecting - Adcom GFA-6002 Owner's Manual

Installing the GFA-6002
and GFA-6006
During normal home operation the
internal heatsinks of the GFA-6002/
6006 may become warm. However,
there are instances during high-level
playback into low impedances when
the heatsinks will become
warmer than usual. To ensure the
amplifier's long-term,
operation it is necessary to provide
adequate ventilation for the heatsinks.
Therefore, the GFA-6002/6006 should
be kept away from external sources
of heat such as radiators and hot-air
ducts. The GFA-6002/6006 should never
be placed with other heat-producing
components in a cabinet or enclosure
lacking free air flow. The top and
bottom panel 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-6002/6006. This is particularly
important if your system includes
low-impedance loudspeakers
are difficult to drive, or if you will
consistently demand
levels from the amplifier and speaker
system. Not only will heat generated by
the amplifier affect the performance
of equipment stacked on top of the
GFA-6002/6006, but the free flow of
air through the ventilating slots in the
amplifier may be partially obstructed.
If you observe these recommendations,
the GFA-6002/6006
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-6002/6006 will ultimately depend
on the care with which you make the
connections between the amplifier,
pre-amplifier, surround sound decoder
and the loudspeakers. All input and
output signal connections should be
made only with high quality, low-loss,
low capacitance cables following the
recommendations in the Inputs and
much
Outputs section of CONNECTING THE
GFA-6002/6006.
trouble-free
Connecting the
GFA-6002 and GFA-6006
When connecting the amplifier to the
loudspeaker, it is vital to maintain
proper polarity (positive to positive,
negative to negative). On the GFA-
6002/6006, the positive terminal is
color coded RED 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."
which
We recommend that your speaker
cables be terminated with "U" type
high volume
spade connectors. These will give the
most contact area insuring long-term
reliability. The spade connector should
have a maximum width of 0.57 inches and
an opening width of no less than 0.25".
To properly connect the speaker cable
to the binding posts, turn the insulated
head of the binding post clockwise until
the wire or connector is firmly secured.
will perform
Finger pressure is sufficient and you
should not use pliers or other tools
which could damage or over-tighten
the binding-post assembly. The binding
posts have been designed in such a
way that finger pressure is all that is
required to cause a "pinching" action
among the different metal surfaces to
ensure proper connection.
It is very important to use the
correct size of wire in order to avoid
unnecessary loss of amplifier power
in the cable, reduction of amplifier
damping factor and other undesirable
conditions. Sound audio engineering
practice suggests the use of at least
AWG16, stranded,
Recommended capacitance of the
speaker wire should not exceed 5OpF
per foot. This insures high frequencies
will not be rolled off.
All loudspeakers having a nominal
impedance down to 4 ohms can be
connected to and driven by the GFA-
6002/6006. The amplifier can drive
these low-impedance
more than adequate power levels
with no difficulty. It should be noted
that many loudspeaker systems which
are nominally rated at 4 ohms drop
in impedance, in some parts of their
frequency range, to as low as 2 ohms
(and sometimes less). You will not
experience difficulties even with these
very low impedance loads unless you
demand excessively high volume levels
from your system.
We do not recommend that you run
multiple sets of speakers to each
speaker output on the GFA-6002/6006.
Instead, we recommend that you use a
multiple speaker selector such as the
ADCOM GFS-300 or GFS-600. A speaker
selector enables you to maintain good
sonic integrity while giving you the
flexibility to add speakers throughout
your house and
impedance levels to help prevent over
heating of the amplifier.
Finally, we suggest that you follow
this chart for speaker wire lengths and
gauges. If longer runs are needed, it is
best to consult with your ADCOM Dealer
to maximize the performance of your
system with your exact conditions.
up to 24 feet — AWGI6
up to 36 feet — AWGI4
up to 58 feet — AWGI2
ADCOM GFA-6006/02 Owner's Manual |
copper cable.
speakers at
maintain proper
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