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Issue 2, September 2007 Model 46 User Guide
Page 10 Studio Technologies, Inc.
typically connected to 2-wire party-line
circuits. By adding DC power sources to
the Model 46’s 2-wire interfaces, the need
for external intercom power supplies could
often be eliminated.
The final step was to create a physical
package that would provide significant re-
sources in a form that allowed simple and
reliable integration with other equipment.
This was accomplished by including two
2-channel interfaces in a one-rack-space
enclosure. Using standard 3-pin XLR-type
audio connectors would enable rapid
installation and troubleshooting. And by
making the Model 46 “universally” pow-
ered, installation in any locale could be
directly supported.
Installation
In this section you will be installing and
interconnecting the Model 46. The one-
rack-space unit will be mounted in an
equipment rack. Audio input, audio out-
put, and party-line intercom connections
will be made by way of 3-pin XLR-type
connectors. AC mains power will be con-
nected by means of a detachable cord
set that is compatible with the Model 46’s
3-pin IEC 320 C14-type inlet connector.
System Components
The shipping carton contains the Model
46 Interface and associated user guide.
Units destined for North America and
Japan also include an AC mains cord.
Your dealer or distributor should provide
an AC mains cord for other destinations.
Locating the Model 46
The Model 46’s mounting location will dic-
tate the length of the cable runs needed to
link the unit with the connected devices.
This is really only a factor in relation to the
2-wire party-line intercom circuits. These
circuits carry unbalanced audio which
can be susceptible to interference and
crosstalk issues. Intercom circuits also
carry DC power which may make resistive
losses come into the picture. In general,
shorter intercom cable lengths will as-
sure more reliable and consistent system
performance. Another location criterion is
access to the Model 46’s front panel. An
optimal location will allow convenient use
of the auto null push buttons and easy
observation of the status and level meter
LEDs.
Mounting the Model 46
Once a mounting location has been se-
lected installation can begin. The Model
46 requires one space (1.75 vertical
inches) in a standard 19-inch (48.3 cm)
equipment rack. Secure the unit into
the equipment rack using two mounting
screws per side.
4-Wire Audio Inputs and
Outputs
Two audio line input and two audio line
output signals are associated with the
4-wire section of each of the Model 46’s
two interface circuits. Connections are
made using standard 3-pin male and
female XLR connectors. Refer to Ap-
pendices A, B, and C for details on inter-
connecting with Telex/RTS, Riedel, and
Clear-Com matrix intercom systems.
4-Wire Line Inputs
As previously mentioned, each of the
Model 46’s two interfaces allows two
analog line-level audio sources to be