Studio Technologies 78 2004 - Manual (Page 9)

Model 78/79 User Guide Issue 5, January 2004
Studio Technologies, Inc. Page 9
for Surround
input source whenever the mode of a re-
cording system changes between playback
and record. This function, often referred to
as PEC/direct switching, allows accurate
monitoring during dialog replacement or
other overdub sessions.
Channel Assignment and Routing
The Model 78/Model 79 combination is
expressly designed to support 8-channel
7.1 monitoring, with the input channels des-
ignated as left, right, center, LFE, surround
left, surround right, back left, and back right.
While it is anticipated that this channel ar-
rangement will be quite common, the chan-
nels can obviously be used in alternative
arrangements. Using the system with 5.1
sources is perfectly acceptable.
While the StudioComm for Surround system
for multichannel monitoring will do many
wonderful things, it is not designed to selec-
tively route input signals to different output
channels. The input-channel-to-output-chan-
nel relationship is maintained. A signal that
arrives on the SL channel of the Surround
B input will, when selected, output only on
the SL channel of the monitor output. Any
rerouting of the input signals must be done
prior to their connection to the StudioComm
for Surround system. This should not be a
drawback in most facilities, but it is impor-
tant to highlight this fact.
Installation
In this section you will be installing the
Model 78 Central Controller in an equip-
ment rack. Audio input and monitor output
connections will be made. A location will be
selected for the Model 79 Control Console
and it will be connected to the Model 78. If
required, external equipment will be inter-
faced to the remote control inputs. AC mains
power will be connected to the Model 78.
System Components
The shipping carton contains one each of
the following: Model 78 Central Control-
ler, Model 79 Control Console, 20-foot
(6.1 m) 9-pin D-sub interconnecting cable,
and user guide. Units destined for North
America also include an AC mains cord.
Your dealer or distributor should provide
an AC mains cord for non-North American
destinations.
Mounting the Model 78
The Model 78 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 79 Control Console. A
20-foot (6.1 m) cable is supplied to con-
nect the Model 78 to the Model 79. You
can supply your own interconnecting cable,
however 50 feet (15.3 m) is the recom-
mended maximum length. Secure the
Model 78 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 78’s back panel. Three cable
harnesses, each with a 25-pin D-sub plug
(male) on one end and the desired con-
nectors on the other end, are necessary.
These cable harnesses are not normally
supplied by Studio Technologies. Note that
our friends in some locations may use the
term “loom” instead of harness.
The wiring scheme used by the D-subs
complies with the one made familiar by
TASCAM® with their DA-88® product. Wir-
ing harnesses prepared for connecting to
the surround inputs are identical to DA-88-
style input harnesses. A wiring harness