User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 9
for Surround
Installation
In this section you will be installing the
Model 780-01 Central Controller in an
equipment rack. Connections to the sur-
round and stereo audio inputs and pre-
and post-fader surround monitor outputs
will be made. A dedicated digital audio tim-
ing reference signal can be connected to
the sync input. If desired, external equip-
ment will be interfaced to the remote con-
trol inputs. A location will be selected for
the first Model 790 Control Console and
it will be connected to the Model 780-01.
AC mains power will be connected to the
Model 780-01. For advanced applications
up to three additional Model 790 or Model
71 Control Console units can be connected
to the Model 780-01.
System Components
The main shipping carton contains one
each of the following: Model 780-01
Central Controller, Model 790 Control Con-
sole, 9-pin D-subminiature interconnecting
cable (approximately 20 feet (6 meters) in
length), and a user guide. Also included
in the shipping carton is a North-Ameri-
can-standard AC mains cord. Your dealer
or distributor should provide an AC mains
cord appropriate for destinations outside of
North America. Any additional Model 790 or
Model 71 Control Consoles will be shipped
in separate cartons.
Mounting the Model 780-01
The Model 780-01 Central Controller
requires one space (1U) in a standard
19-inch (48.3 cm) equipment rack. Secure
the Model 780-01 into the equipment rack
using two mounting screws per side. Select
a location that is convenient for making
connections to the audio signals as well
as interfacing with the first (or only) Model
790 Control Console. A cable is supplied
to connect the Model 780-01 to the Model
790. If the needs of a specific installation
dictate, an alternate-length interconnecting
cable can be fabricated and used.
Audio Connections
Audio input connections are made by way
of one 25-pin female D-subminiature con-
nector and one 3-pin female XLR connec-
tor. Audio monitor output connections are
made by way of one 25-pin female D-sub-
miniature connector. The connectors are
located on the Model 780-01’s back panel.
Refer to Figure 2 for a detailed view of
these connectors.
Audio Inputs
Two balanced digital surround (7.1) and
one balanced digital stereo audio source
can be connected. Users will be able to
monitor them, one at a time, using the pre-
and post-fader monitor outputs. A one-to-
one relationship is maintained between the
input and output channels, i.e., left input to
left monitor output, right input to right moni-
tor output, center input to center monitor
output, etc. (Of course this won’t be true in
the case where the user has enabled one
of the three downmix functions.)
The audio inputs support digital audio
signals with sample rates of up to 44.1,
48, 88.2, and 96 kHz and a depth (word
length) of up to 24 bits. It’s recommended
that the connected signal sources maintain
a common sample rate and timing refer-
ence. Having all signals “locked” together
helps to ensure proper handling by the
Model 780-01’s all-digital signal path.