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dbx 160X
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OPERATING
NOTES
dbx
Professional
Products
Using
the
SLAVE
button
(Stereo
Operation)
Two
channels
of
program
material
do
not
necessarily
constitute
a
stereo
program.
A
stereo
program
is
one
where
the
two
channels
are
recorded
and/or
mixed
to
create
the
illusion
of
a
single
unified
“panorama”
of
sound.
The
stability
of
the
psychoacoustic
“image”
of
each
sound
source
within
the
stereo
program
depends
upon
its
ability
to
maintain
a
specific
phase
and
amplitude
relationship
from
left
to
right
channel.
If
two
independent
compressors
are
used
to
process
the
stereo
program,
a
loud
sound
occurring
in
one
channel
will
cause
a
gain
reduction
only
in
that
channel.
This
gain
reduction
would
cause
the
perceived
image
of
any
sound
spread
between
the
two
channels
to
move
toward
the
side
which
had
not
been
compressed,
because
the
spread
signal
would
be
momen¬
tarily
softer
in
the
compressed
channel.
This
can
be
avoided
by
linking
the
two
compressors
in
such
a
way
that
both
channels
receive
the
same
amount
of
compression.
On
the
160XT,
this
is
accomplished
by
means
of
the
STRAPPING
jacks;
a
cable
between
these
jacks
permits
the
RMS
de¬
tectors
of
both
units
to
“talk”
to
one
another
—
but
only
when
one
of
the
units’
SLAVE
buttons
is
depressed.
The
SLAVE
unit
then
sends
its
signal
to
the
MASTER,
where
the
RMS
power
of
the
MASTER
and
SLAVE
sig¬
nals
are
combined
to
generate
a
control
voltage.
This
control
voltage
is
then
used
to
compress
both
the
MASTER
and
SLAVE
units
equally.
When
compressing
a
stereo
program
with
a
pair
of
160XTs,
only
the
MAS¬
TER
unit
controls
need
to
be
adjusted.
METER
CALIBRATION
control
The
INPUT/OUTPUT
LEVEL
DISPLAY
in
the
160XT
is
factory-calibrated
to
indicate
“0"
when
the
signal
is
+4dBu
(1.23Vrms)
at
either
the
input
or
output
of
the
160XT,
depending
on
the
DISPLAY
function
switch
position.
(The
METER
CALIBRATION
control
does
not
affect
the
GAIN
CHANGE
LEDs.)
To
recalibrate
the
LEVEL
DISPLAY,
depress
the
DISPLAY
button
to
me¬
ter
the
INPUT
LEVEL,
and
feed
a
1kHz
signal
at
the
selected
nominal
op-
.
erating
level
(the
level
desired
for
a
”0dB"
meter
indication)
to
the
160XT’s
SIGNAL
INPUT.
Then
adjust
the
rear
panel
METER
CALIBRATION
con¬
trol
until
the
meter
indicates
“OdB.”
10

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