Studio Technologies StudioComm 792 User manual

50396-0221, Issue 1
© 2021 by Studio Technologies, Inc., all rights reserved
studio-tech.com
Model 792 Central Controller and
Model 793 Control Console
User Guide
Issue 1, February 2021
This User Guide is applicable for systems consisting of:
Model 792: serial number M792-00151 and later with application rmware 1.05 and later;
Model 793: serial number M793-00151 and later with application rmware 1.03 and later
with Dante®Support

This page intentionally left blank.

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 3
with Dante Support
Table of Contents
Revision History............................................................ 4
Introduction................................................................... 5
Installation ....................................................................10
Dante Configuration......................................................18
Model 792 and Model 793 Configuration .....................20
Operation......................................................................34
Technical Notes ............................................................40
Specifications ...............................................................46
Appendix A—Connection Pin-Out Charts.....................48
Appendix B—Network Configuration Examples ...........50
Appendix C—Default Dante Channel Names...............52
Appendix D—Model 792 and Model 793 Factory
Default Values ..............................................................53
Appendix E—Model 792 Control Using HTTP..............54

Issue 1, February 2021 Model 792/793 User Guide
Page 4 Studio Technologies, Inc.
with Dante Support
Revision History
Issue 1, February 2021:
•Initial release.

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 5
with Dante Support
Introduction
Dante®digital audio has found wide accep-
tance in all aspects of audio, from live enter-
tainment and broadcast events, to corporate,
recording, and post-production facilities.
While certainly a legacy technology, analog
audio signals have maintained an important
place in the world of professional audio.
And the days of needing to support only
2-channel stereo and 5.1 or 7.1 surround
formats have ended. The variety of sur-
round formats, and their associated channel
counts and arrangements, has expanded the
need for specialized equipment. The ability
to monitor these Dante digital and analog
audio sources in a convenient and sonically
excellent way has become a requirement
for many applications. Studio Technologies
has addressed these needs with the Studio-
Comm with Dante Support system consist-
ing of the Model 792 Central Controller and
the Model 793 Control Console.
Rather than supporting a specic surround
format, the StudioComm with Dante Support
system incorporates an internal 16-channel
architecture. This allows a range of surround
audio applications to be easily supported.
With Dante digital and analog audio inputs,
Dante digital and analog monitor outputs, and
an extensive set of operating resources it’s a
simple task to integrate a monitoring system
into virtually any contemporary facility. The
carefully selected group of features, includ-
ing both 16-channel surround and 2-channel
stereo inputs, congurable input-signal time
delays, multiple pre- and post-fader outputs,
and mute/solo functions make the system
powerful yet simple to operate. And by using
the best of contemporary technology, as well
as following rigorous design practices, the
system’s audio quality is excellent.
A StudioComm with Dante Support system
starts with the Model 793 Control Console.
It’s the system’s “command center” and is
designed to reside at a user’s location, al-
lowing ngertip selection of all monitoring
functions. Numerous LED indicators pro-
vide complete status information. A backlit
OLED display indicates key operating and
conguration parameters. The second part
of the StudioComm system is the Model 792
Figure 1. Model 792 Central Controller front view
Status LEDs
AC Mains
Input
Figure 2. Model 792 Central Controller back view
3.5 mm
Jack
DC
Input
Analog
Surround
Outputs
Analog
Surround
Inputs
To/From
Control
Consoles
Ethernet
Ports
USB
Port
Level
Control
Signal
Present
LEDs

Issue 1, February 2021 Model 792/793 User Guide
Page 6 Studio Technologies, Inc.
with Dante Support
Central Controller. This one-rack-space unit
contains all the circuitry required to support
the Dante digital and analog audio input and
output signals. It links with the Model 793
using a 9-conductor D-subminiature cable.
An integral web server allows fast and ex-
ible conguration of the unit’s networking,
audio, and Dante performance. This allows
the system’s performance to be optimized to
meet the needs of many specic applications.
Dante audio resources include both surround
and stereo inputs and outputs. The Dante
surround input and output functions consist
of 16 independent channels while the stereo
input and output functions support two chan-
nels. The Dante channels are compatible with
AES67 and support Dante’s ST 2110 imple-
mentation. Analog audio resources include a
16-channel surround input, a 2-channel ste-
reo input, and a 16-channel surround output.
Great care was taken in designing the sys-
tem’s circuitry, ensuring that the character
of the Dante digital and analog audio input
signals is preserved. All audio processing
is performed in 32-bit logic using a high-
speed eld-programmable-gate-array (FPGA)
integrated circuit. The performance of the an-
alog-to-digital and digital-to-analog functions
will meet or exceed virtually any professional
audio product. The sonic performance of the
StudioComm system is completely “pro” with
no compromises.
The Model 792 Central Controller occupies
one space (1U) in a standard 19-inch rack.
Dante digital audio sources are interfaced
using one or two gigabit (GigE) Ethernet
network connections that use RJ45 connec-
tors. This arrangement allows switched or
redundant Dante operation. A third gigabit
network connection provides an independent
means of accessing the Model 792’s congu-
ration webpages. This ensures that facilities
can support separate audio and maintenance
networks. Standard connectors on the Model
792 allow simple interfacing with Dante
digital audio, analog audio, control console,
and power connections. AC mains power is
connected directly to the Model 792, with an
acceptable range of 100 to 240 V, 50/60 Hz.
A source of nominal 12 volts DC can also
be connected. If both power sources are
connected the AC mains source will provide
operating power while the DC source serves
as a “hot standby.”
Two Surround and Two Stereo
Inputs
The Model 792 allows connection of one
Dante digital surround and one analog sur-
round signal source. Each surround input
allows up to 16 independent channels to
be supported with no dened format. This
provides exibility for installations that utilize
formats such as 7.1, 7.1.2, 7.1.4, 10.2, 11.1,
11.1.4, etc. Each of the 16 channels associ-
ated with a surround input is full-delity and,
as such, is appropriate to use as a main,
surround, back, side, ceiling, or low-frequen-
cy enhancement channel. This exibility al-
lows the Model 792 to be utilized in a variety
of applications, including experimental or
test formats.
Figure 3. Model 793 Control Console front view

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 7
with Dante Support
Support for two 2-channel stereo inputs is
also provided. A Dante stereo input allows
two channels of Dante audio to be selected
for monitoring. An unbalanced analog in-
put, located on the Model 792’s front panel,
allows the output of a “semi-pro” personal
audio device to be directly connected.
The audio performance of the Model 792’s
analog inputs is very good. Low-noise, wide
dynamic-range circuitry ensures that the
audio quality is preserved. The analog audio
signals are routed to high-performance ana-
log-to-digital conversion (ADC) circuitry that
supports a bit depth of 24 and sample rates
of 44.1, 48, and 96 kHz. A precision volt-
age-reference circuit helps the ADC circuitry
perform highly accurate signal conversion.
The audio signals, now in the digital domain,
are routed to a high-speed programmable
logic (FPGA) device where they are mixed
and level-controlled as necessary.
Each of the four inputs, two surround and
two stereo, can have a unique name as-
signed to it. This can be helpful when a
Model 793 Control Console user is selecting
which input to monitor. In addition, a time
delay can be applied to each input, useful
for compensating for video processing or
display “latency.” Delays of up to 999 milli-
seconds, as related to a sample rate of
48 kHz, can be applied. Each input channel,
36 in total, can be level “trimmed” over a
±20 dB range in steps of 0.1 dB.
Analog Surround Input
The Model 792 provides 16 independent
analog input channels which are compat-
ible with balanced or unbalanced line-level
sources. These inputs have a nominal level
of +4 dBu and are electronically balanced
(di󰀨erential), capacitor-coupled, and ESD
(static) protected for reliable operation in
demanding applications. Extensive ltering
minimizes the chance that radio frequency
(RF) energy will cause interference. The
analog inputs are protected from damage
should a moderate DC voltage be acciden-
tally connected. These characteristics make
the analog inputs suitable for use in studio
and mobile facility environments. The analog
input signals are converted to 24-bit digital
and then utilized by the internal logic circuit-
ry. Compatible signal sources include audio
consoles, broadcast playback equipment,
and analog output ports on routers and
networked audio equipment.
Dante Surround Input
The Model 792 provides a 16-channel
“wide” Dante input for direct interfacing with
applications that utilize Dante technology.
As with the Analog Surround Input, the for-
mat of the 16 input channels is not dened.
Signals with a bit depth of up to 24 and
sample rate of 44.1, 48, or 96 kHz are com-
patible. The Dante surround input channels
have a nominal signal level of –20 dBFS.
Analog Stereo Input
A 3-conductor 3.5 mm jack is located on the
Model 792’s front panel and allows direct
interconnection with the output of a personal
audio device. The input circuitry is optimized
for use with “semi-pro” equipment that has
a nominal level of –10 dBu. A rotary level
control and two signal-present LEDs enable
a user to easily optimize the sensitivity of the
input circuitry, matching its performance to
the nominal level of the connected source.
A high-performance ADC circuit converts the
analog signal to 24-bit digital.
Dante Stereo Input
The Model 792 provides two Dante digital
audio input channels for interfacing with a
stereo source. As with the Dante Surround
Input, the Dante Stereo Input has a nominal

Issue 1, February 2021 Model 792/793 User Guide
Page 8 Studio Technologies, Inc.
with Dante Support
level of –20 dBFS, a bit depth of up to 24,
and sample rate support of 44.1, 48, and
96 kHz.
Three Monitor Outputs
The StudioComm with Dante Support sys-
tem provides three monitor outputs: one
16-channel Dante digital, one 16-channel
analog, and one 2-channel stereo Dante
digital. Conguration choices allow the
characteristics of the three outputs to be
optimized to meet the requirements of spe-
cic applications. For exibility, a congura-
tion menu choice allows the level of each
analog output channel to be individually
adjusted (“trimmed”) over a range of ±20 dB
in 0.1 dB steps.
Analog Output
The Analog Surround Output is 16 chan-
nels “wide” and can be selected for pre- or
post-fader (before or after the level control)
operation. These analog output channels are
intended for connection to inputs on audio
ampliers or powered loudspeakers associ-
ated with a monitor loudspeaker system.
Power-up/power-down muting relays help
to protect the loudspeaker system from un-
wanted transient signals.
The analog surround output channels have
a nominal level of +4 dBu and are electroni-
cally balanced, capacitor-coupled, and ESD
(static) protected. High-quality components,
including the critical digital-to-analog con-
verters, are used to provide low-distortion,
low-noise, and sonically excellent perfor-
mance. Robust circuitry provides protection
from damage should a moderate DC voltage
be accidentally connected, something espe-
cially useful in broadcast applications. The
analog outputs are compatible with virtually
all balanced and unbalanced loads with an
impedance of 2 k ohms or greater.
The Model 792’s analog output channels
have a maximum level of +24 dBu. This
allows both compatibility and signicant
headroom in applications where digital
audio input signals with a nominal level of
–20 dBFS need to be converted into analog
signals that have a nominal level of +4 dBu.
Dante Surround and Stereo Outputs
The Model 792 provides two Dante monitor
outputs. One is 16 channels and the other
is 2-channel stereo. Each is selectable to be
either pre- or post-fader and can be routed
(Dante subscribed) to inputs on compatible
monitor loudspeakers. They can also be
utilized for level metering or other general-
purpose uses, typically congured for pre-
fader operation. The nominal level of the
Dante monitor outputs is –20 dBFS. Each
Dante output channel can have its level indi-
vidually adjusted (“trimmed”) over a range
of ±20 dB with a step size of 0.1 dB.
Dante Performance
Two of the Model 792’s three gigabit
Ethernet ports are utilized by the Dante
audio interfaces. These ports can be
selected, using the Dante Controller soft-
ware application, for switched or redundant
Dante operation. Support is provided for
both AES67 and Dante Domain Manager™
(DDM) operation. The Model 792 will also
support Dante’s ST 2110 implementation.
The StudioComm with Dante Support sys-
tem allows the Dante audio sample rate to
be selected for 44.1, 48, or 96 kHz with a bit
depth of 24. The Dante Controller software
application is used to route (subscribe) the
Model 792’s receiver (input) and transmitter
(output) channels with the associated Dante
compliant-equipment.

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 9
with Dante Support
Operation
The Model 793 Control Console provides
the operator with an easy-to-use interface
and includes a set of pushbutton switches,
a rotary control, and a backlit OLED graphics
display. Together these resources are used
to select the desired monitoring environ-
ment. User functions include selecting the
input source, adjusting the listening level,
selecting the monitor output, and activating
other special features. The four audio inputs,
two 16-channel surround and two 2-channel
stereo, can be individually selected for moni-
toring. Although only one is typically selected
to be monitored at any one time, for ex-
ibility two, three, or all four can be combined
(summed) and monitored. The rotary control
(actually an encoder with 30 steps per rota-
tion) allows adjustment of the monitor output
level in 0.5-dB steps.
For content conrmation, each of the unit’s
sixteen channels can be individually muted
or soloed as desired. Multiple channels can
also be simultaneously muted or soloed
and needed. A reference level value can
be saved and then enabled by the opera-
tor, allowing the monitor output level to be
directly returned to a known value. A mute
all function simultaneously mutes all sixteen
output channels. The dim feature allows
the operator to attenuate the monitor output
level from among four congurable values.
The graphics display will show a variety of
system-related information. This includes
the text names that have been assigned to
the input sources and output destinations.
The display will also show the current moni-
tor output level directly in dB. Pressing the
rotary control’s knob will cause the man-
agement port’s IP address to display, help-
ful when conguring the StudioComm with
Dante Support system.
LED indicators are provided on both the front
and back panels of the Model 792. These
relate to selected performance characteris-
tics of the Ethernet interfaces, Dante inter-
face, general system activity, and levels of
the unbalanced stereo audio input. They can
be useful during installation, troubleshooting,
and operation of the StudioComm system.
Special applications can take advantage of
the Model 792 Central Controller’s ability to
be controlled using an API running under
an operating system on external computer
hardware. Using HTTP, in the form of send-
ing GET or POST HTTP requests, all Model
793 Control Console user control functions
can be duplicated using a software-based
application. These HTTP requests will inter-
face with the Model 792 by way of the man-
agement Ethernet interface.
Simple Installation
The Model 792 Central Controller uses stan-
dard connectors to allow fast and convenient
interconnections. Gigabit Ethernet connec-
tions are made to local area network (LAN)
ports using three RJ45 connectors, two for
Dante and one for management. Multiple
LEDs on the unit’s back panel display the
status of the network connections. Four
25-pin female D-subminiature connectors
are used to interface with the unit’s 16 chan-
nels of analog surround input and 16 chan-
nels of analog monitor output. A 3-conductor
3.5 mm jack, located on the Model 792’s
front panel, allows connection of a source
of unbalanced stereo audio.
A detachable power cord is used to connect
the Model 792 to a source of AC mains pow-
er. A DC power source can be connected
using a 4-pin XLR connector. The lightweight
aluminum enclosure mounts in one space

Issue 1, February 2021 Model 792/793 User Guide
Page 10 Studio Technologies, Inc.
with Dante Support
(1U) of a standard 19-inch rack enclosure.
An interconnecting cable with 9-pin male
D-subminiature plugs on each end are used
to interconnect the Model 792 Central Con-
troller with the Model 793 Control Console.
An interface cord with an approximate length
of 20 feet (7.3 meters) is included with each
StudioComm system. The standalone Model
793 Control Console is typically placed on a
surface that allows easy operator access.
AC and DC Power
The Model 792 allows an AC mains source
of 100-240 V, 50/60 Hz to be connected by
way of a detachable power cord. The unit
can also be powered using a 12 volts DC
source that is connected via a broadcast-
standard 4-pin XLR connector. If both the AC
and DC power sources are connected the
Model 792 will be powered by the AC mains
supply. Only if the AC mains source fails
will a load be placed on the DC source. The
Model 792 Central Controller provides a cur-
rent-limited source of 12 volts DC power for
use by the Model 793 Control Console.
Future Capabilities and
Firmware Updating
Both the Model 792 and Model 793 were
designed so that their capabilities can be
easily enhanced in the future. A USB con-
nector, located on the Model 792’s back
panel, allows its main and FPGA rmware
(embedded software) to be updated us-
ing a USB ash drive. The Model 792 uses
Audinate’s Brooklyn II module to implement
its Dante connectivity. The rmware in this
module can be updated via the unit’s Ether-
net connections, helping to ensure that the
Dante capabilities remain up to date. The
Model 793 also utilizes a USB connector,
located inside the unit, to allow its main
rmware to be updated. All rmware les
and conguration parameters are securely
stored in non-volatile memory.
Installation
In this section, the Model 792 Central Con-
troller will be mounted in one space (1U) of
an equipment rack. Ethernet data connec-
tions will be made. Some applications will
require analog audio input and/or output
signals be interconnected. A location will be
selected for the Model 793 Control Console
and it will be interconnected with the Model
792. AC mains and/or DC power will be
connected to the Model 792.
Up to three Gigabit Ethernet data connec-
tions will be made to the Model 792 using
standard RJ45 patch cables. Connections
can be made to the Analog Surround Output
using two 25-pin D-subminiature connec-
tors. If needed for the application, line-level
Analog Surround Input connections will be
made using two additional 25-pin D-submin-
iature connectors. A 3-conductor 3.5 mm
jack, located on the front panel, is provided
for interconnection with a source of stereo
analog audio. It will typically remain avail-
able for temporary use by a personal audio
device, however a permanent connection
can be made.
AC mains power can be connected to the
Model 792 by means of a detachable cord
set that is compatible with the unit’s 3-pin
IEC 320 C14 inlet connector. Some applica-
tions may warrant connection to a source
of nominal 12 volts DC which can be made
by way of a 4-pin XLR connector. The DC
source can be used to power the Model 792
or it can serve as a backup power source
should AC mains be connected.

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 11
with Dante Support
What’s Included
The shipping carton contains one each of
the following: Model 792 Central Controller,
Model 793 Control Console, 9-pin D-submin-
iature interconnecting cable (approximately
20 feet (6 meters) in length), and instructions
on how to obtain an electronic copy of this
guide. Also included in the shipping carton is
a North-American-standard AC mains cord.
For destinations outside of North America the
local reseller or distributor should provide an
appropriate AC mains cord.
Mounting the Model 792
The Model 792 Central Controller requires
one space (1U) in a standard 19-inch
(48.3 cm) equipment rack. Secure the Model
792 into the equipment rack using two mount-
ing screws per side. As the Model 792 does
not contain a fan or other noise-producing
source it can be located within a room or
other structure where audio monitoring is
going to take place. Select a location that
is convenient for making connections to the
Ethernet interfaces, analog audio outputs and
inputs, and interfacing with the Model 793
Control Console. Twisted-pair (UTC) Ethernet
has a 100-meter (325-foot) interconnection
cable limitation. But that can be overcome by
using a ber-optic interconnection between
the Model 792 and the Ethernet switch or
switches in the one or more associated local-
area-networks (LANs). A 3-conductor (stereo)
3.5 mm jack is located on the Model 792’s
front panel. This allows direct connection of
an analog source provided by a personal au-
dio device. Selecting a location for the Model
792 that allows ready access to this jack can
be helpful in some applications. A cable is
supplied for interconnecting the Model 792
with the Model 793. If the needs of a specic
installation dictate, an alternate-length inter-
connecting cable can be fabricated and used.
Ethernet Connections
The Model 792 provides three Gigabit (GigE)
Ethernet ports for exibility and compatibil-
ity with many networking implementations.
Two ports are provided for interconnections
with one or two local area networks (LAN)
associated with Dante audio-over-Ethernet
networking schemes. They are labeled as
PRI (primary) and SEC (secondary). Using
the Dante Controller application these ports
can be congured for Switched or Redun-
dant Dante operation. The third Ethernet
port, labeled MGMT, is dedicated to access-
ing the Model 792’s management resources.
An internal web server function supports the
Model 792’s management port’s webpages.
These webpages are used for conguration,
monitoring, and maintenance of Model 792
and Model 793 operation.
By providing three Ethernet ports the Model
792 allows support for facilities that uti-
lize independent networks for Dante audio
transport and equipment management. In
this way, “production” networks that support
transport of audio signals by way of a single
LAN (for Switched Dante) or two LANs (for
Redundant Dante) can be separate from an
engineering network that is used by techni-
cal personnel for conguring and maintain-
ing a facility or “plant.”
Figure 4. Detail of Model 792 back panel showing
the Ethernet port’s RJ45 jacks

Issue 1, February 2021 Model 792/793 User Guide
Page 12 Studio Technologies, Inc.
with Dante Support
Connections to the three Ethernet interfaces
are made by way of standard RJ45 connec-
tors (jacks) that are located on the back of
the Model 792’s enclosure. The Ethernet
interfaces support auto MDI/MDI-X so that
crossover cables are not required.
Refer to Appendix B, located at the back of
this guide, for examples of how the Model
792’s three Ethernet interfaces might be
utilized.
Dante Port Connections
At least one 1000BASE-T (GigE) Ethernet
connection is required for Model 792 Dante
operation. It should be connected to the pri-
mary RJ45 jack. A second 1000BASE-T
connection can be made to the secondary
RJ45 jack if Redundant Dante is desired.
(For this functionality to be active the Model
792’s network conguration must be set
for Redundant within the Dante Control-
ler software application.) While technically
100BASE-TX Ethernet can also be used
for these Dante connections, it is not opti-
mal. Additionally, it’s important to note that
10BASE-T Ethernet connections are not
su󰀩cient.
When congured in Dante Controller for the
Switched network mode the Model 792’s
secondary Dante Ethernet connection can
also be used as a “loop through” port such
as would be provided by an Ethernet switch.
Switched mode is the default setting but us-
ing the secondary Dante port in this manner
for applications other than troubleshooting
or “looping” to access the Model 792’s man-
agement port is not recommended. It will
function reliably but “daisy chaining” Ether-
net signals can limit exibility and present a
failure point; it’s optimal if each Dante Ether-
net interface connects directly to a separate
port on an Ethernet switch.
Management Port Connection
An Ethernet signal is required to be intercon-
nected with the management port so that
Model 792 conguration and management
can be performed. It’s recommended that a
1000BASE-T (GigE) connection be made
but a 100BASE-TX or even a 10BASE-T
connection is su󰀩cient. (GigE will provide
the best performance and it’s assumed that
all contemporary applications will support
it.) The Model 792’s management port can
share a network that is being used by the
unit’s one or two Dante network connections.
Refer to Appendix B for examples of how
this can be easily implemented.
Dante and Analog Audio
The Model 792 provides both Dante digital
and analog audio output signals. In most
cases, the Analog Surround Output chan-
nels will be congured for post-fader opera-
tion and connected to inputs on ampliers
or amplied speakers. The Analog Surround
Output can also be congured for pre-fader
operation. Dante Surround and Dante
Stereo Outputs are also provided. They
too can be congured for pre- or post-fader
operation. Surround and stereo audio inputs
are available in both Dante digital and line-
level analog formats. These output and input
resources allow a combination of Dante digi-
tal and analog connections to be made so
as to best support a wide range of specic
applications.
Analog Audio Connections
Connecting analog signals to and from the
Model 792 are made by way of four 25-pin
female D-subminiature (DB-25F) connec-
tors and one 3-conductor 3.5 mm jack. Two
of the D-sub connectors are associated with
the Analog Surround Output channels; the
other two D-subs are used by the Analog

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 13
with Dante Support
Surround Input channels. The 3.5 mm jack
is provided for interconnecting with a stereo
analog audio source typically provided by a
personal audio device. Refer to Figures 1 and
2 for a view of the 3.5 mm connector on the
front and the D-sub connector on the back.
Analog Surround Output
Two 25-pin female D-subminiature connec-
tors (DB-25F), labeled Analog Surround
Output Channels 1-8 and Analog Surround
Output Channels 9-16, are located on the
Model 792’s back panel. They provide access
to the sixteen Analog Surround Output chan-
nels.These outputs are electronically bal-
anced and will perform optimally when driving
loads of 2 k (2000) ohms or greater. In most
situations, these outputs will be connected
to inputs on audio ampliers associated with
monitor loudspeakers or to the inputs of loud-
speakers that contain integrated ampliers
(“amplied speakers”).
The wiring scheme used by the D-subminia-
ture connectors comply with AES59-2012,
as made popular by TASCAM. Wiring assem-
blies prepared for use with the Model 792’s
Analog Surround Output channels should
be identical to that of TASCAM-type output
assemblies. Refer to Figures 6 and 7 or
Appendix A for the exact connection details.
But note that unlike TASCAM-type assem-
blies, the Model 792’s D-sub connectors use
“locking” screws with 4-40 threads.
In most applications, 3-pin male XLR con-
nectors will be used to interface with the
inputs on the associated ampliers or am-
plied speakers. In this case, a Model 792
monitor output channel’s + terminal would
go to pin 2 of the XLR, the – terminal to XLR
Channel High (+) Low (–) Shield
1 24 12 25
2 10 23 11
3 21 9 22
4 7 20 8
5 18 6 19
6 4 17 5
7 15 3 16
8 1 14 2
Notes:
1) Connector type is 25-pin female D-subminiature (DB-25F).
Installer must provide male (DB-25M). Connector uses
4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows AES59-2012 convention. Standard
TASCAM-type wiring harnesses are typically compatible
(locking hardware requires 4-40 screw threads).
Figure 6. Connections for Analog Surround
Output Channels 1-8
Channel High (+) Low (–) Shield
9 24 12 25
10 10 23 11
11 21 9 22
12 7 20 8
13 18 6 19
14 4 17 5
15 15 3 16
16 1 14 2
Notes:
1) Connector type is 25-pin female D-subminiature (DB-25F).
Installer must provide male (DB-25M). Connector uses
4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows AES59-2012 convention. Standard
TASCAM-type wiring harnesses are typically compatible
(locking hardware requires 4-40 screw threads).
Figure 7. Connections for Analog Surround
Output Channels 9-16
Figure 5. Detail of Model 792 back panel
showing the Analog Surround Output Channels

Issue 1, February 2021 Model 792/793 User Guide
Page 14 Studio Technologies, Inc.
with Dante Support
pin 3, and the shield terminal to XLR pin 1.
Balanced connection of the Analog Surround
Output channels is the preferred connection
method but unbalanced operation does not
pose a problem. To connect to an unbal-
anced input, connect the + terminal as signal
high, and only the Model 792’s shield termi-
nal as the signal low/shield. Leave the –
terminal unconnected. For correct unbal-
anced operation it is important not to con-
nect the – terminal and shield together.
How the Analog Surround Output functions
will depend on its conguration. When its
source is selected for pre-fader the sixteen
output channels will have a xed nominal
level of +4 dBu. When selected for a post-
fader choice the output level of the Analog
Surround Output channels will depend on
the setting of the level control located on the
Model 793 Control Console. When the level
trim conguration parameters are set for
0 dB and the level control is at its maximum
value (0 on the display) the input-to-output
signal path will be at unity gain; no gain or
attenuation will impact the signal.
A level trim conguration selection in one
of the Model 792’s management webpages
allows adjustment of the signal level of each
individual channel over a –20.0 to +20.0 dB
range. This will ensure that the Analog
Surround Output channels can be compat-
ible with audio signals and equipment that
have a wide range of nominal levels. In
some cases, the output level might ben-
et from being reduced, such as by 10 dB,
rather than having gain added.
Analog Surround Input
Two female 25-pin D-subminiature (DB-25F)
connectors, located on the Model 792’s back
panel, are used to connect with up to sixteen
channels of line-level analog audio associ-
ated with a surround source. The connectors
are labeled Analog Surround Input Channels
1-8 and Analog Surround Input Channels
9-16. Refer to Figures 9 and 10 or Appendix
A for details on the exact pinout of these
D-sub connectors. The wiring scheme used
by the D-subminiature connectors comply
with AES59-2012, as made popular by
TASCAM. A wiring assembly prepared for
use with the Analog Surround Input channels
would be identical to a standard TASCAM-
type input assembly with the exception of
using “locking” screws with 4-40 threads.
Each Analog Surround Input circuit is elec-
tronically balanced and optimized for con-
nection to a balanced or unbalanced source
with a nominal signal level of +4 dBu. A con-
guration selection in one of the Model 792’s
management webpages allows adjustment
of the input gain of each individual chan-
nel over a –20.0 to +20.0 dB range. This
will allow the inputs to be made compatible
with audio signals that have a wide range of
nominal levels. When connecting a consum-
er-level (“–10 dBV”) audio source adding
12 dB of gain to each input might be e󰀨ec-
tive. In some legacy applications, adding
10 dB of gain to an input channel associated
with a low-frequency-enhancement (LFE)
channel may be appropriate.
Figure 8. Detail of Model 792 back panel
showing the Analog Surround Input Channels

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 15
with Dante Support
Balanced analog sources should be wired
so that signal high is connected to +, signal
low to –, and shield to the shield connection.
With an unbalanced source, connect signal
high to the + connection, and shield to
both the – and the shield connections. If
connecting to an unbalanced analog source
in this manner results in hum or noise try
connecting signal high to + and shield to –;
leave the shield connection unterminated.
Analog Stereo Input
A 3-conductor (stereo) 3.5 mm jack and
associated rotary potentiometer are located
on the Model 792’s front panel. Together
they allow direct interfacing with a source of
analog stereo audio, typically provided by
a personal audio device. The input circuit’s
nominal level is –10 dBu, but the potentiom-
eter will allow sources with a nominal level
moderately lesser or greater than –10 dBu
to be e󰀨ectively utilized.
Channel High (+) Low (–) Shield
1 24 12 25
2 10 23 11
3 21 9 22
4 7 20 8
5 18 6 19
6 4 17 5
7 15 3 16
8 1 14 2
Notes:
1) Connector type is 25-pin female D-subminiature (DB-25F).
Installer must provide male (DB-25M). Connector uses
4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows AES59-2012 convention. Standard
TASCAM-type wiring harnesses are typically compatible
(locking hardware requires 4-40 screw threads).
Figure 9. Connections for Analog Surround Input
Channels 1-8
Channel High (+) Low (–) Shield
9 24 12 25
10 10 23 11
11 21 9 22
12 7 20 8
13 18 6 19
14 4 17 5
15 15 3 16
16 1 14 2
Notes:
1) Connector type is 25-pin female D-subminiature (DB-25F).
Installer must provide male (DB-25M). Connector uses
4-40 threaded inserts for locking with mating plug.
2) Wiring scheme follows AES59-2012 convention. Standard
TASCAM-type wiring harnesses are typically compatible
(locking hardware requires 4-40 screw threads).
Figure 10. Connections for Analog Surround Input
Channels 9-16
Figure 11. Detail of Model 792 front panel
showing analog stereo input
In most cases, the 3.5 mm jack will be left
unterminated allowing a temporary connec-
tion to be made. However, there’s no reason
why a permanent connection can’t be made.
The interconnecting cable’s 3-conductor
3.5 mm plug should be wired such that left
channel audio is on the tip lead, right chan-
nel audio is on the ring lead, and audio
shield/common is on the sleeve lead. Refer
to Figure 12 for connection details.
A conguration selection in one of the Model
792’s management webpages allows adjust-
ment of the input gain of each channel over
a –20.0 to +20.0 dB range. In most cases,
changing the trim value to something other
than 0 will not be necessary.

Issue 1, February 2021 Model 792/793 User Guide
Page 16 Studio Technologies, Inc.
with Dante Support
The Model 792’s connector pinout scheme
was designed to allow creation of an inter-
connecting cable which uses commonly
available 2-pair audio cable. This cable, con-
sisting of two twisted pairs each with an in-
dividual shield, is typically small in diameter,
exible, and available in many colors. One
pair and shield can be used for the data con-
nections: data+ on pin 1, data– on pin 6, and
shield on pin 2. The second pair and shield
can be used for the DC connections: DC+
on pin 4, DC– on pin 9, and shield on pin 5.
This implementation has the advantages of
providing a shield for the data path and a
more robust common (return path) connec-
tion (two conductors including the shield) for
the DC power source.
A few simple calculations are required to
determine the maximum cable length when
fabricating a “custom” cable to connect the
Model 792 to the Model 793. The di󰀨erential
transmission scheme used by the system’s
RS-485 interface makes an interconnection
in excess of 1000 feet (>300 meters) easily
possible. The limiting factor is typically the
ability of the wiring to pass the DC power
supplied by the Model 792 to the Model 793.
The Model 792 supplies 12 volts DC, 500
milliamperes (mA) maximum which will pro-
vide a signicant power margin to support
lengthy cable runs.
Signal Pin Direction
Data + (RS-485) 1 To/From Model 793
Data – (RS-485) 6 To/From Model 793
Data Shield 2 To/From Model 793
DC + (12 V) 4 To Model 793
DC – (12 V Return) 9 To Model 793
DC Power Shield 5 To/From Model 793
Note: Connector type on Model 793 is 9-pin female
D-subminiature (DE-9F). Connector uses 4-40
threaded inserts for locking with mating plug.
Figure 14. Connections between Model 792 and
Model 793
Figure 13. Detail of Model 792 back panel showing
the DE-9F connector
Figure 12. Connections for mating plug compatible
with the Analog Stereo Input 3.5 mm receptacle
Connecting the Model 792 to
the Model 793
A 9-pin female D-subminiature connector
(DE-9F), labeled To/From Control Consoles,
is provided on the back panel of the Model
792 Central Controller. This is used to inter-
face the rack unit with the Model 793 Control
Console. Refer to Figure 14 or Appendix A
for details. A cable with 9-pin male D-sub
(DE-9M) connectors on each end is used to
interconnect the Model 792 with the Model
793. A cable, approximately 20 feet (6 me-
ters) in length, is included in the shipping
carton. This cable implements all nine con-
nector pins in a one-to-one manner.
Should an interconnecting cable of a di󰀨er-
ent length be required there’s no problem for
one to be fabricated and used. While it can
be wired in a one-to-one fashion supporting
all nine pins, only four connections are actu-
ally required: pin 1 (data+), pin 6 (data–),
pin 4 (DC+), and pin 9 (DC–).

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 17
with Dante Support
The Model 793 requires a minimum of 9
volts DC, 75 mA maximum, for operation.
(The voltage must be measured directly at
the Model 793’s 9-pin D-subminiature con-
nector.) As such, the maximum intercon-
necting cable length is directly related to
the resistive voltage loss associated with
the two DC-carrying conductors (supporting
pins 4 and 9). As the Model 792 supplies
12 volts and the Model 793 requires 9 volts
minimum, this leads to a 3 volts maximum
drop due to the interconnecting cable. Us-
ing Ohm’s law, it’s quite easy to determine
if a desired cable length can be supported.
Calculate the voltage drop by multiplying the
total resistance (in ohms) of the proposed
cable by 0.075 (the Model 793’s maximum
required current in amperes). Remember
to include the resistance in both conductors
(DC+ and DC–) when calculating the voltage
drop. If the voltage drop in the cable is
3 volts or less it should function correctly.
If it’s greater than 3 volts the cable is too
long or the wire gauge is too small.
Connecting Power to the
Model 792
The Model 792 requires a source of AC
mains or nominal 12 volts DC for operation.
Either source can be connected with the
same result. Both can also be simultaneous-
ly connected if a redundant (backup) power
scheme is desired.
Connecting AC Mains Power
The Model 792 can operate directly from AC
mains power of 100 to 240 volts, 50/60 Hz,
20 watts maximum. As a “universal mains
input” device there are no switches to set
or jumpers to install. A 3-pin IEC 320 C14
inlet connector on the back panel mates
with a detachable mains cord set. Refer to
Figure 15 for a detailed view.
Figure 15. Detail of Model 792 back panel showing
the AC mains power connector
All units are supplied from the factory with
an AC mains cord that has a North-American
(NEMA 5-15L) standard plug on one end
and an IEC 320 C13 connector on the other
end. Units intended for use in other destina-
tions require that an appropriate mains cord
be obtained. The wire colors in the mains
cord should conform to the internationally
recognized color code and be terminated
accordingly:
Connection Wire Color
Neutral (N) Light Blue
Line (L) Brown
Earth/Ground (E) Green/Yellow
Because the Model 792 does not contain
a power on/o󰀨 switch it will begin operation
as soon as AC mains power is connected.
Safety Warning: The Model 792 does
not contain an AC mains disconnect
switch. As such, the AC mains cord
plug serves as the disconnection de-
vice. Safety considerations require that
the plug and associated inlet be easily
accessible to allow rapid disconnection
of AC mains power should it prove
necessary.

Issue 1, February 2021 Model 792/793 User Guide
Page 18 Studio Technologies, Inc.
with Dante Support
Connecting DC Power
The Model 792 can also operate from a
source of 10 to 18 volts DC. The current
required from a 12 volts DC source is 1.6
ampere maximum. A 4-pin male XLR con-
nector, located on the unit’s back panel, is
used to connect the source of DC. Refer
to Figure 16 for a detailed view. Prepare a
mating connector (female) so that pin 1 is
DC– and pin 4 is DC+. Pins 2 and 3 are not
used and should remain unconnected. This
connector type and pinout have become a
broadcast DC power standard and should
be familiar to many technical personnel.
Because the Model 792 contains no power
on/o󰀨 switch it will begin operation as soon
as a DC power source is connected.
As previously mentioned, both an AC
mains source and a DC source can be
connected at the same time. If this is the
implementation then the AC mains source
will always power the Model 792 with the DC
source serving as a “hot standby.” Only if the
AC source fails will the unit draw power from
the DC source. This will occur automatically
with no interruption of Model 792 operation.
In this “standby” mode (when an AC mains
source is connected) the Model 792 draws
less than 100 microamperes (uA) from the
DC input.
Dante Conguration
For audio to correctly pass to and from the
StudioComm system requires, at a mini-
mum, that several Dante-related parameters
be congured. These conguration settings
are stored in non-volatile memory within the
Model 792’s Dante network interface circuitry.
Conguration will typically be done with the
Dante Controller software application, avail-
able for download free of charge at audinate.
com. Versions of Dante Controller are avail-
able to support several operating systems.
The Model 792’s Dante interface is compat-
ible with the Dante Domain Manager (DDM)
software application. Refer to DDM docu-
mentation, also available from Audinate,
for details on which Model 792 and related
parameters may have to be congured.
Audio Routing
The Model 792’s eighteen Dante transmit-
ter (output) channels can be assigned to the
desired Dante receiver (input) channels on
associated equipment. This will route the
sixteen channels associated with the Dante
Surround Output and the two channels as-
sociated with the Dante Stereo Output to the
devices that will be “listening” to them. Within
Dante Controller a “subscription” is the term
used for routing a transmitter ow (a group of
up to four output channels) to a receiver ow
(a group of input channels).
The Model 792 uses the Brooklyn II mod-
ule to implement its Dante functionality. The
number of transmitter ows associated with
this module is 32 and, as such, typically no
ow limitation will occur. Flows, which can
support up to four audio channels, can either
be unicast, multicast, or a combination of the
two. (Note that in the AES67 mode the Dante
transmitter (output) channels will only func-
tion in multicast; unicast is not supported.)
Figure 16. Detail of Model 792 back panel showing
the DC input power connector

Model 792/793 User Guide Issue 1, February 2021
Studio Technologies, Inc. Page 19
with Dante Support
Using Dante Controller the desired Dante
transmitter (output) sources can be routed to
the eighteen Dante receiver (input) channels
associated with the Model 792. The exact
number utilized will depend on the specic
application. Sixteen of the Dante receiver
(input) channels are assigned to the Model
792’s Dante Surround Input and two chan-
nels are associated with the Model 792’s
Dante Stereo Input.
Unit and Channel Names
The Model 792 has a default Dante device
name of ST-M792- along with a unique suf-
x. The su󰀩x identies the specic Model
792 that is being congured. The su󰀩x’s ac-
tual alpha and/or numeric characters relate
to the MAC address of the unit’s Brooklyn II
module. The eighteen Dante transmitter
(output) channels have default names of
Sur Ch1 through Sur Ch16, St Ch1, and
St Ch2. The eighteen Dante receiver (input)
channels have default names of Sur Ch1
through Sur Ch16, St Ch1, and St Ch2.
Using Dante Controller, the default device
and channel names can be revised as ap-
propriate for a specic application. Refer
to Appendix C at the end of this guide for a
summary of the channel numbers, names,
and descriptions.
Device Conguration
The Model 792 supports audio sample rates
of 44.1, 48, and 96 kHz with no pull-up/down
options available. The digital audio data is
in the form of pulse-code modulation (PCM)
samples. Encoding choices within Dante
Controller are PCM 16, PCM 24, and PCM
32, but in most cases the selection of PCM
24 would be appropriate. Clocking and
device latency parameters can be adjusted
if required but the default values in Dante
Controller are typically correct.
Network Conguration – Dante
The Model 792 allows connection of three
Ethernet signals using standard RJ45 jacks
which are located on the back panel. Two
jacks are for use by Dante and the third
for connecting to a network designated for
management or maintenance purposes.
The Dante ports are labeled PRI and SEC
indicating that they are the primary and
secondary connections. How these two
ports function can be selected in the Dante
Redundancy section of Dante Controller’s
Network Conguration tab. The choices are
Switched or Redundant.
If Switched is selected then the Model 792
can establish one connection with an Eth-
ernet network. It doesn’t matter which RJ45
jack is utilized, although for clarity this would
typically be the primary jack. The secondary
RJ45 jack can be used to interconnect with
another piece of networked equipment.
If the Model 792’s Dante network is cong-
ured for Switched ensure that only one of
the two Dante RJ45 jacks on the back panel
is connected to the LAN associated with the
Dante network. If both of the Model 792’s
Dante RJ45 connections are routed to ports
on the same LAN this will typically “crash”
the network! (Although some of the latest/
most-advanced Ethernet switches will auto-
matically detect and prevent such a “network
bridging” issue from occurring.)
If Redundant is selected then Dante’s
Redundant networking capability will be
enabled. In this case, separate network
connections should be made to the primary
and secondary RJ45 jacks.

Issue 1, February 2021 Model 792/793 User Guide
Page 20 Studio Technologies, Inc.
with Dante Support
Network Conguration –
IP Addresses
When the Model 792 has been congured
for the Switched network mode a single
Dante IP address will be associated with the
network connection that is made to either
the primary or the secondary RJ45 jack. If
the network conguration has been selected
for Redundant then separate IP addresses
and related network parameters will be as-
signed to the primary and secondary Dante
Ethernet ports.
Typically, the Model 792’s Dante IP address
or addresses and related network param-
eters will be determined automatically using
DHCP or, if that’s not available, the link-
local network protocol. If desired, Dante
Controller allows IP addresses and related
network parameters to be manually set to
a xed (static) conguration. While this is a
more-involved process than simply letting
DHCP or link-local “do their thing,” if xed
addressing is necessary then this capability
is available.
Note that if the Model 792’s network congu-
ration has been set for Redundant then the
primary and secondary Dante IP addresses
and related parameters can be independent-
ly congured. This allows both interfaces to
be congured automatically, both interfaces
to be congured manually, or one interface
congured automatically and the other con-
gured manually.
AES67 Conguration – AES67
Mode
Dante Controller allows a Model 792 to
be congured for AES67 operation. This
requires the AES67 mode to be set for En-
abled. As previously noted, if AES67 mode is
Enabled then the Dante transmitter (output)
channels will use multicast. The sample rate
will be xed at 48 kHz.
Model 792 Clocking Source
While technically the Model 792 can serve
as a Leader clock for a Dante network (as
can all Dante-enabled devices), in most
cases the unit will be congured to receive
its timing reference (“sync”) from another
Dante device. As such, the Dante Controller
check box for the Preferred Leader that is
associated with the Model 792 would typi-
cally not be enabled.
Model 792 and
Model 793
Conguration
Many Model 792 Central Controller and
Model 793 Control Console operating pa-
rameters can be congured using the web-
pages that are provided by way of the Model
792’s management Ethernet port. A standard
web browser is all that is required to utilize
the menu webpages. Of course, the device
hosting the web browser must be part of the
same network that includes the Model 792’s
management Ethernet port. The manage-
ment port’s network conguration can also
be revised using the Model 793 Control
Console’s conguration resources.
Management IP Address
It’s easy to identify the active management
IP address. With the StudioComm system
powered and operational, and a network
connection made to the management port,
press the Model 793 Control Console’s level
control. The management IP address will
show on the Model 793’s display. The level