User Guide

OPERATING
INSTRUCTIONS
SA SERIES
AMPLIFIERS
SA SERIES
MIXER
AMPLIFIERS
Congratulations
on
your
purchase
of our
SA series
mixer amplifier.
As
you
are
no
doubt
aware
,
mains
power
must
be disconnected before
removing the
lid
or
making
any
internal
adjustments
or connections
to
the amplifier.
The
SA Series
Mixer
Amplifiers
are two
rack
height
units suitable
for
direct
rack mounting
in
a
standard
482mm
rack
format,
or desV
table mount by
means of the
rubber feet
provided.
They
are equipped
with lour
balanced
microphone
inputs,
one
line
input
and
two auxiliary
inputs
(switched). The
following
informa tion
will
provide
setting up
and connectior(iirformation
for use
in
a conventional
sound
reintorcement
system.
More
detailed
information
and
performance
data
is
available
from
your
dealer
or any
Audio
Telex
Communication's oflice.
SETTING UP
For normal
operation
the
master
gain
control should be set
at
mid
position
and the
various
microphone
,
line
or auxiliary cpntrols adjusted
to their desired
level. See details
under
"
controls"
below.
PANEL
CONTROLS
(fig
1
)
7...."
MASTER
"
This
control
adjusts the overallvolume
from the output of the
mixer section
of the
amplifier.
Normal
position
for this control
is
5
,
which will enable
the overall
volume
level from the amplifler
to be
adjustecl up or
down as
required.
1...."
MIC
"
Marked one
to
four,
these controls
will respond to
microphone inputs connected
at the
rear
of
the
amplifier.The
setting
will
depend
upon the sensitivity
of the
microphone,
which is connected.
Generally
a
setting
of
six to seven
is ideal for
most
dynamic
microphones
with an
impedance of
200 ohms,
however the
purpose
of multiple microphone
inputs is to enable
microphones o{
varying levels to be
mixed to
produce
the
desired
performance
level.
2...."
LINE
"
The line
input will respond to
inputs connected
to the appropriate
connections
at the
rear of the
amplilier.Generally,
program
sources
sucfi
as a tape deck,
cd
disc
player,
telephone
line
or
wireless
microphone can be connected
to this
input.
3...."
AUX
"
The
auxiliary
control
is
used
in
conjunction
with the switch
marked
"
AUX1
-
AUX2
"(4).
Auxiliary
inputs such as
tape decks, background
music
players,
radio tuners
or
wireless microphones
are some
of
the
sources
normally
connected
to these
inputs.
The
switch
"
AUX1
-
AUX2
"
should
be
pressed
"
in
"
to connect
auxiliary
input one and
"
out
"
to connect auxiliary
input two.
Note that
it is not
possible
to amplify
both
auxiliary
inputs
simultaneously
,
although they
can be
permanently
connected
,
(
see connection
details
)
.
5...." BAS.S
"
The
bass
control
will
normally
be
operated
in the
zero
position
to
obtain a
flat
overall
responsefor the amplifier.
To
boost the
bass
response ol the amplilier
turn the control
clockwise
towards
five. To cut bass
response turn the cantrol counter
clockwise
towards
five.
6...."
TREBLE
"
The
treble
control
will normally be operated
in the
zero
position
,
which sets
the treble
response
of
the amplifier
for
a flat
performance.
To
boost the
high frequency
perform
ance
of the
amplilier
,
adjust
the control cloclarvise
towards
five. To
cut the
high frequency
response
,
turn
the control
counter
dockwise
towards
five.
9...."
VU METER
"
Marked
in
decibel
graduation
from
+3
to 21
,
the
light
emitting
diodes
will indicate
the
volume
level
at the output
of the amplifier.
For normal operation
the
l.e.d.s
glow green
as they
modulate
with
the output
level of the amplifier.
lf the
lights
cunsistently
indicate red, the amplifier
is
being
over-driven
,
resulting
in
distortion
in the
quality
of the output
signal.
8...."
POWER
"
This switch turns
on or off the
mains
power
to the
amplifier.
An
Le.d.
glows
red to
indicate
the amplifier
is
turned
on.
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