Issue 2, January 2005
Model 68A/69A User Guide
Page 10
Studio Technologies, Inc.
for Surround
provided so that communications systems,
machine control systems, or communica-
tion functions associated with audio con-
soles can easily be interfaced. Remote
input select allows a machine control
system or audio storage device to control
which input source is selected for monitor-
ing. Audio-post professionals will know this
as PEC-Direct switching.
Limitations on Signal Routing
While the StudioComm Model 68A/Model
69A will do many wonderful things, it is not
designed to selectively route input signals
to the different monitor output channels.
A
fi
xed input-channel-to-output-channel
relationship is maintained. A signal on
the LFE channel of Surround B will, when
selected, output only on the LFE channel
of the monitor output. Any rerouting of the
input signals must be done prior to con-
nection to the StudioComm system. This
should not be an impairment in most facili-
ties, but it’s important to highlight this fact.
Audio Channel Assignment
The designers of the StudioComm Models
68A and 69A made the decision to assign
the audio channels in the order of left,
center, right, left surround, right surround,
and LFE. It was felt that this was a con-
venient, rational arrangement, common
to many “5.1” installations and one that
would
fi
t the needs of most operators.
However, not all formats follow this con-
vention. Major audio companies such as
Dolby Laboratories and DTS may use
different channel assignment schemes in
their release formats. It is hoped that care-
ful interconnection of audio signals during
installation, or incorporating routing
fl
ex-
ibility using a patch bay, will mitigate any
signi
fi
cant inconveniences.
Installation
In this section you will be installing the
Model 68A Central Controller in an equip-
ment rack. Audio input and monitor output
connections will be made. A location will
be selected for the Model 69A Control
Console and it will be connected to the
Model 68A. If required, external equipment
will be interfaced to the remote control
inputs. AC mains power will be connected
to the Model 68A.
System Components
The shipping carton contains one each of
the following: Model 68A Central Control-
ler, Model 69A Control Console, 20-foot
(6.1 m) 9-pin D-sub interconnecting cable,
user guide, and warranty card. Units des-
tined for North America also include an AC
mains cord. Your dealer or distributor will
provide an AC mains cord for non-North
American destination.
Mounting the Model 68A
The Model 68A Central Controller requires
one space in a standard 19-inch (48.3 cm)
equipment rack. Select a location that is
convenient to both the analog audio sig-
nals and the Model 69A Control Console.
A 20-foot (6.1 m) cable is supplied to
connect the Model 68A to the Model 69A.
You can supply your own interconnecting
cable, however 50 feet (15.3 m) is the rec-
ommended maximum length. Secure the
Model 68A into the equipment rack using
two mounting screws per side.
Audio Connections
Audio signal connections are made by
way of three 25-pin D-sub connectors,
located on the Model 68A’s back panel.
Three cable harnesses, each with a