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Adcom GFA-555 Pro - Wiring and Connections; Input and Output Wiring

Adcom GFA-555 Pro
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SECTION
3
WHERE
(AND
HOW)
ALL
THE
WIRES
GO
All
connections
are
conveniently
located
on
the
rear
panel
of
the
GFA-555
PRO.
Any
suitable
program
source;
such
as
a
control
preamplifier
or
mixing
board
may
be
used.
ALL
CONNECTIONS
MUST
BE
MADE
WITH
THE
AMPLIFIER
UNPLUGGED
AND
THE
AC
POWER
SWITCH
OFF.
Inputs
are
provided
for
both
Balanced
and
Unbalanced
input
signals.
There
is
a
selector
switch
on
the
rear
panel
of
the
amplifier
for
Balanced
and
Unbalanced
Input
selection.
The
jacks
provided
for
Unbalanced
input
signals
are
standard
2
conductor
1/4
inch
phone
type.
The
jacks
provided
for
the
Balanced
input
signals
are
for
XLR
connectors.
Input
signal
attenuators
are
provided
for
matching
left
and
right
signal
levels.
These
attenuators
are
mounted
on
the
front
panel
for
your
convenience.
The
Output
terminals
on
the
GFA-555
are
the
standard
S-wav
binding
posts.
The
output
terminals
are
spaced
to
permit
the
use
of
the
so
called
“Banana
Plugs'
when
using
the
amplifier
as
a
stereo
unit.
When
connecting
speakers
to
the
GFA-555,
vou
should
alwavs
use
the
largest
wire
size
(lowest
gauge
number)
that
is
available
to
you.
We
recommend
at
least
16
gauge,
2-conductor
cord
(zip
cord)
for
distances
up
to
25
feet.
For
distance
up
to
50
feet,
14
gauge
wire
should
be
used.
You
may
also
wish
to
consider
some
of
the
commercially
available
speaker
cables
which
have
been
designed
to
improve
the
connection
between
the
power
amp
and
the
speakers.
When
connecting
the
speaker
wires,
correct
phasing
is
required
to
obtain
maximum
bass
response
and
to
preserve
a
coherent
sound
when
vocalists
perform.
The
simplest
way
to
insure
proper
phasing
is
to
inspect
the
wires
being
used.
Some
form
of
coding
is
always
employed,
whether
a
ridge
or
groove
on
one
edge
or
side
of
the
wire,
or
the
wires
may
be
of
different
colors:
one
copper
wire
and
one
silver.
For
example,
to
connect
a
speaker
to
the
Left
Channel
of
the
GFA-555
using
a
length
of
color
coded
wire,
connect
the
copper
colored
wire
to
the
Left
Channel
Positive
(Red)
output
terminal
on
the
amplifier.
Next
connect
the
silver
colored
wire
to
the
Left
Channel
Negative
(Black)
output
terminal.
Now
connect
the
other
end
of
the
copper
colored
wire
to
the
Positive
terminal
of
the
Left
speaker.
Connect
the
other
end
of
the
silver
colored
wire
to
the
Negative
terminal
of
the
Left
speaker.
Follow
the
same
procedure
for
connecting
the
Right
speaker
to
the
Right
channel
outputs.
IT
IS
IMPERATIVE
THAT
THE
MAIN
POWER
TO
THE
AMPLIFIER
IS
DISCONNECTED
DURING
THE
HOOK
UP
PROCEDURE.
The
GFA-555
PRO
has
a
detachable
grounded
AC
line
cord.
This
cord
should
be
connected
to
the
amplifier
before
plugging
the
unit
into
the
AC
wall
outlet.
Remember,
all
input
and
output
connections
should
be
made
before
plugging
the
amplifier
into
the
wall
outlet.
After
the
correct
hook
up
procedure
has
been
followed,
the
AC
line
cord
should
be
plugged
into
an
outlet
providing
120
volts
AC,
50/60
Hz.

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