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6
Rear Panel
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Figure
3:
Rear Panel
A.
SIGNAL INPUT jacks
The Tip/Ring/Sleeve
phone jack and XL-type
connector are wired in parallel; either
Signal
Input
will accept an audio
signa
l
for processing
by the 160XT. The phone jack accepts a
stan-
dard TRS
l/4"
phone plug for a balanced input
source, or
a
2-circuit
(Tip/Sleeve)
1/4"
phone
plug for an unbalanced
source
.
The XL-type
plug
connector
is wired pin
3
HOT(+), pin
2
COLD(-)
and pin 1 GROUND.
B.
DETECTOR INPUT
This Tip/Ring/Sleeve
phone jack accepts a
standard TRS ¼" phone plug, and is
of
the
Rear
Panel
"norrnalling"
type. That is, when a phone plug
is inserted, the detector input is no
longer
con-
nected in parallel with the audio input.
C.
SIGNAL OUTPUT - XL-type connector
The 160XT has an active-balanced amplifier ca-
pable of driving a 600
ohm (or
greater) load to
+24dBu. Pin
3
is the HOT(+) lead, pin 2 is the
COLD(-) lead and pin 1 is circuit ground. Do
not short either pin
2
or pin 3 to ground, unless
you have installed the
opt
ional
transformer.
This will not damage the unit, but may increase
distortion.
(See
page 28 for transformer balanc-
ing
options.)
dbx 160XT
D. SIGNAL OUTPUT
-
phone jack
G.
STEREO STRAPPING jack
The 160XT has a
separate single-ended (unbal-
anced) output amplifier
also
capable
of
driving
a 600 ohm
(or
greater) load to +24dBu. In nor-
mal operation the Tip/Ring/Sleeve
phone jack
is internally wired with the TIP HOT(+),
and
the RING and SLEEVE connected to circuit
ground.
In BYPASS mode, however, the RING
is
connected
to the COLD
(-)
leads
of
the input
jacks, to allow for 1:1 connections.
E.
GROUND (GND) Lift switch
This
switch
allows for troubleshooting hum
(line interference) caused by ground loops. In
the
"GND"
position, pin 1
of
the input XL-type
connector is connected to the 160XT's
circuit
ground.
In
the
"LIFT"
position it is discon-
nected. This is not a
chassis-isolate switch.
The
circuit ground
is floating with the respect to the
chassis.
F.
METER CALIBRATION control
This
screw-drive r-adjus
table
trimmer may be
used to precisely calibrate the front panel
's
upper LED display
so
a OdB INPUT
or OUT-
PUT indication is equivalent to any
signal
from
-
lSdBu
(138mVrrns)
to +lOdBu (2.45Vrrns).
When a
TRS
(Tip/Ring/Sleeve)
¼"
phone plug
patch
cable
is inserted between two 160Xs,
ste-
reo strapping can be
achieved
by
depressing
the
SLAVE switch on
one unit only.
This
will
provide accurate processing for
a
stereo pro-
.
gramrmng.
H. AC line voltage requirement indicator
This recessed indicator displays the nominal
AC
line
voltage for which the 160XT has been
set at the factory.
I.
AC power cable
Connect this
cable
to any SOHz
or 60Hz AC
power
source of
the
correct
line voltage,
as
shown
by the AC LINE VOLTAGE requirement
indicator above. The Model
160XT consumes
a
maximum of 12 watts AC
power.
WARNING: Be sure to
verify
both
your
actual
line
voltage and
the
voltage
for which your
Model
160XT
was wired, as indicated
on
the
rear panel of your unit. Connection to
an
inap-
propriate power
source
may result in extensive
damage
which is not
covered
by the
warranty.
•
7
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