dbx 166 Manual de inicio rápido - Página 6
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TYPICAL
HOOKUPS
All
1
66 connections are
made
through
tfie
rear
phone
jacks;
our
figures
in
this
sec-
tim
show
the wiring
of plugs
and
cables to
make
these connections. Again,
tip
is
plus
(or
high,
or
hot),
ring
is
minus
(or
low),
and
sleeve
is
ground
or
shield
(or
earth).
Audio
inputs
and balanced and unbalanced sources
Your
unit's
two
signai inputs
are balanced electronically with
differential
ampli-
fiers.
They
won't unbalance a balanced
source,
and they
may
be used with unbaianced
sources as
well.
Here's
a general-purpose diagram:
SIGNAL
FLOW
—
For
maximum hum
rejection,
avoid
common
grounding
at the 166's input
and
ouput.
The
best starting point
Is
to
ground the
shield
of the input Ce^le
and
the source device
(ieaving
it
unconnected
to
tiie
166)
and
to
ground
the
shield
of the output cable to the
ground
of
the
1
66
(leaving
it
unconnected
at the receiving device).
A
baianced
line
is
defined as
two-conductor
shielded
cable with
each
of the
two
center conductors carrying the
signal
but
of
opposite
polarity
and
equal but opposite
potential difference
from
ground.
An
unbalanced
line
is
a slngle'^onductor
Yielded
cable with the center
conductor
carrying the
signal
and
the
shield at
ground
potential.
Figure
1
shows
the
ccmnection
of
baianced
signal
sources
to either
audio
input
jack.
Note
that
for
this
connection a
3-circuit
phone
plug
is
necessary,
as
is
dual-
conductor
shielded cable.
Sometimes
the plug
is
called
a
"stereo"
phone
plug
because
it's
often used
for
such stereo
circuits
as
headphones.
AT
TMI9
M
ir
H*.
OCVB.OPS
Figure
1:
Balanced sources
Figures 2a
and
2b
show
an unbalanced source connected
to
these
inputs.
In
2a,
a
3-circuit
phone
plug
is
used
(and
the
ring
is
connected
to the
shield),
while
in
2b a
2-cir-
cuit
("mono")
phone
plug
is
used. Since
this
plug has
a continuous
sleeve
(where the
3-cir-
cuit plug
has both sleeve
and
ring),
the plug automatically shorts the sleeve
to the ring at
the 166
input.
Figure
2a:
Unbalanced
sources,
dual^:onductor
shielded cable
Figure
2b:
Same,
single-conductor cable
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4
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