Studio Technologies 46A - Manual (Page 10)

Issue 1, September 2014 Model 46A User Guide
Page 10 Studio Technologies, Inc.
typically connected to 2-wire party-line cir-
cuits. By adding DC power sources to the
Model 46A’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 au-
dio connectors would enable rapid instal-
lation and troubleshooting. And by making
the Model 46A “universally” powered,
installation in any locale could be directly
supported.
Installation
In this section you will be installing and
interconnecting the Model 46A. 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 connec-
tors. AC mains power will be connected
by means of a detachable cord set that is
compatible with the Model 46A’s 3-pin IEC
320 C14 inlet connector.
System Components
The shipping carton contains the Model
46A 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 46A
The Model 46A’s mounting location will
dictate the length of the cable runs need-
ed to link the unit with the connected de-
vices. 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 assure more reliable and consistent
system performance. Another location
criterion is access to the Model 46A’s front
panel. An optimal location will allow con-
venient use of the auto null push buttons
and easy observation of the status and
level meter LEDs.
Mounting the Model 46A
Once a mounting location has been se-
lected installation can begin. The Model
46A 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 46A’s
two interface circuits. Connections are
made using standard 3-pin male and
female XLR connectors. Refer to Appen-
dices A, B, and C for details on intercon-
necting with RTS, Riedel, and Clear-Com
matrix intercom systems.