Issue 4, March 1997
Model 80 User Guide
Page 10
Studio Technologies, Inc.
Prepare the input plugs so that tip is
positive (+ or hot), ring is negative ( or
cold), and sleeve is shield. The input
jacks will also accept unbalanced ¼-inch
2-conductor phone plugs. With unbal-
anced phone plugs, tip is positive (+ or
hot) and sleeve is shield. If 3-conductor
phone plugs are used to connect unbal-
anced signals, connect positive (+ or hot)
to tip and connect shield to ring and
sleeve.
Loop-Through
The two loop-through jacks are electrically
wired in parallel with the two input jacks.
With this arrangement several applications
are possible, such as allowing the input
signals to be routed to another stereo
input without the use of Y-adapters. The
source signals would be connected to the
input jacks. The loop-through jacks would
be used to connect the source signals to
the next piece of equipment using ¼-inch
3-conductor patch cords.
Another application would be where more
than one Model 80 is used to distribute the
same input signal. Two ¼-inch 3-conduc-
tor patch cords would link the loop-
through jacks on the first Model 80 to the
input jacks on the second Model 80.
Yet another application would be where
the Model 80 is used as a 1-input/16-
output monaural distribution amplifier. The
monaural input would be connected to the
left input jack, and a ¼-inch 3-conductor
patch cord would connect the left loop-
through jack to the right input jack.
Audio Outputs
The Model 80 contains eight independent
stereo line-level outputs which are in-
tended for connection to a variety of ana-
log audio devices. The outputs are
electronically balanced and capable of
driving balanced or unbalanced loads of
600 ohm or greater. The outputs can be
individually configured for a nominal
output level of 10 or +4dBu, so you can
connect to all line-level inputs with no
hassle.
Prepare the output plugs so that tip is
positive (+ or hot), ring is negative ( or
cold), and sleeve is shield. The output
jacks will also accept unbalanced ¼-inch
2-conductor phone plugs. With unbal-
anced phone plugs, tip is positive (+ or
hot) and sleeve is shield. If a 3-conductor
phone plug is used in an unbalanced
application, connect positive (+ or hot) to
tip and connect shield to ring and sleeve.
AC Mains Power
The Model 80 is internally configured to
operate from either 100, 120, or 220/240V,
50/60Hz. In most cases, units shipped to
North America are factory selected for
120V operation. Units bound for Japan are
selected for 100V, while our friends down
under and in Europe receive units set for
220/240V. Before connecting the Model 80
to AC mains power, check that it is config-
ured to match the local mains voltage.
Look on the back panel, adjacent to the
power entry connector, for the configured
voltage(s). Note that an incorrect configu-
ration could seriously damage the unit.
Should it be necessary to change the
units operating voltage it must be
performed only at the factory or by an
authorized service technician.
The Model 80 uses an IEC standard con-
nector to mate with the AC mains cord.
The wire colors in the AC mains cord
should conform to the internationally
recognized CEE color code and must
be wired accordingly:
Summary of Contents for 80 M80-00273
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