Peavey PA 700S - Page 8

NL a] CHANNEL ee
19 20
GRAPHIC
EQUALIZERS
(11)
(12)
are
provided
for
each
of
the
outputs
from
the
master
section.
Each
equalizer
is
capable
of
12.0
dB
of
boost
or
cut
at
nine
frequencies.
The
equalizers
are
of
the
latest
active
filter
network
design
for
maximum
reliability
and
performance.
When
correctly
used,
graphic
equalizers
are
a
valuable
tool
for
feedback
suppression
and
compensating
for
speaker
system
deficiencies.
They
should
not
be
considered
as
a
cure-all
for
every
acoustic
environment.
When
used
for
feedback
suppression,
the
normal
operating
mode
will
be
in
the
CUT
configuration.
It
is
very
important
that
both
equalizers
be
adjusted
to
the
center
or
“flat”
position
before
starting
the
feedback
suppression
procedure.
The
following
procedure
will
aid
in
correctly
adjusting
the
graphic
equali-
zers.
1.
Adjust
the
graphics
to
the
center
or
“flat“position.
2.
Adjust
the
individual
channel
EO
controls
for
the
desired
tonal
quality.
3.
Slowly
start
increasing
the
master
level
controls
until
feedback
occurs.
A
point
worth
noting
is
that
one
or
more
microphones
on
stage
will
be
more
prone
to
feedback
than
others.
This
is
rather
easily
determined:
Just
place
your
hand
over
the
front
of
the
microphone.
Feedback
should
occur
immediately
if
that
microphone
is
at
the
threshold
point.
Keep
this
microphone
mind
when
per-
forming
the
remainder
of
this
procedure.
4.
At
this
point,
the
system
should
be
trying
to
go
into
a
feedback
mode.
Move
your
hand
in
front
of
the
worse
case
micophone
if
necessary
to
cause
a
sustained
feedback
condition.
DO
NOT
ALLOW
the
system
to
go
into
a
completely
uncontrolled
feedback
condition.
5.
Slowly
adjust
each
band
of
the
graphic
equalizers
until
the
first
feedback
frequency
is
found.
Always
adjust
one
slider
at
a
time
and
if
that
slider
does
not
reduce
the
feedback,
return
it
to
the
center
position.
Once
the
frequency
is
found,
adjust
the
equalizer
slider
to
the
point
at
which
the
feedback
stops.
Any
further
adjustment
at
that
frequency
will
result
in
an
undersirable
overall
sound.
6.
There
will
usually
be
two
or
more
points
at
which
any
sound
system
will
go
into
feedback.
Carefully
“tune”
out
the
second
feedback
point
the
same
way
as
previously
described.
After
the
second
feedback
point
is
removed
by
equalization,
little
will
be
gained
by
further
adjustment
of
the
graphic
equalizers.
At
all
times,
it
should
be
remembered
that
the
largest
and
most
expensive
systems
will
go
into
feedback
at
some
point.
Over
equalization
should
be
avoided
at
all
costs;
after
a
certain
point,
only
overall
degradation
of
your
sound
will
result.