Studio Technologies 5205 User manual

50280-1223, Issue 5
Copyright © 2023 by Studio Technologies, Inc., all rights reserved
studio-tech.com
User Guide
Issue 5, December 2023
This User Guide is applicable for serial numbers
M5205-02001 and later with application rmware 3.2 and later.
Model 5205
Mic/Line to Dante Interface

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Model 5205 User Guide Issue 5, December 2023
Studio Technologies, Inc. Page 3
Model 5205
MIC/LINE TO DANTE INTERFACE
Table of Contents
Revision History............................................................................ 4
Introduction................................................................................... 5
Getting Started ............................................................................. 7
Connections.................................................................................. 7
Dante Conguration...................................................................... 8
Operation...................................................................................... 8
Technical Notes ............................................................................ 10
Specications ............................................................................... 13

Issue 5, December 2023 Model 5205 User Guide
Page 4 Studio Technologies, Inc.
Model 5205
MIC/LINE TO DANTE INTERFACE
Revision History
Issue 5, December 2023:
•Revises format of document.
•Notes support for AES67 and Dante Domain Manager (DDM).
Issue 4, November 2021:
• Updates specications and incorporates general improvements.
Issue 3, August 2021:
•Documents that the P48 status LED will no longer necessarily be blue in color.
Issue 2, August 2017:
•Documents that the unit now supports the STcontroller software application.
Issue 1, August 2015:
•Initial release.

Model 5205 User Guide Issue 5, December 2023
Studio Technologies, Inc. Page 5
Model 5205
MIC/LINE TO DANTE INTERFACE
Introduction
The Model 5205 Mic/Line to Dante Interface is a
general-purpose audio device that supports applica-
tions utilizing the Dante
®
Audio-over-Ethernet media
networking technology. Two analog microphone
or line-level audio signals can be connected to the
Model 5205. They are amplied as required and then
converted to digital audio channels on an associated
Dante connection. With the inherent interoperability of
Dante, the Model 5205 can be used with other Studio
Technologies’ Dante-enabled products or a multitude
of devices from many other manufacturers.
Microphone or line-level balanced analog audio
signals are connected using two 3-pin XLR connec-
tors. The gain of the associated preamplier circuitry
can be selected for 0, 20, 30, 40, 50, or 60 dB. P48
phantom power is provided to support condenser
microphones. LEDs display the status of the gain
and phantom power functions. Multi-step LED meters
provide confirmation of the level of the two Dante
transmitter (output) audio channels.
The gain of the preamplifiers and on/off status of
the P48 phantom power sources can be selected
locally using the pushbutton switches. They can
also be monitored and selected remotely using the
STcontroller application.
The audio quality of the Model 5205’s two audio
channels is excellent, with low distortion, low noise,
and high headroom. Careful circuit design and rugged
components ensure long, reliable operation. A wide
range of applications can be supported, including TV,
radio, and streaming broadcast events, corporate and
government AV installations, and post-production
facilities.
The Model 5205 requires an Ethernet connec-
tion to supply both the data interface as well as
Power-over-Ethernet (PoE) power. This requires an
Ethernet connection from a PoE-enabled Ethernet
switch. Alternately, the Model 5205 can be powered
by an external midspan PoE power injector.
Applications
The Model 5205 is perfect for use in conjunction with
a variety of fixed and portable audio applications
where one or two analog audio signals need to join a
Dante “network.” The unit’s high-performance audio
circuitry allows virtually any source to be handled
correctly. Essentially all condenser, dynamic, or ribbon
microphones are compatible, as are most balanced
and unbalanced analog line-level sources. The simple
user controls, along with an extensive set of status
indicators, help to ensure optimum performance is
maintained. With the unit’s compact size and PoE
powering, it’s simple to deploy multiple units to inte-
grate a distributed set of sources into a Dante appli-
cation. For permanent applications there’s no reason
why a Model 5205 can’t reside within an equipment
rack or be mounted, using optional brackets, under-
neath a table or on-air studio set. In a conference
room setting the unit can be permanently connected
to a PoE-enabled Ethernet port, ready to accept a
signal source from various user-provided devices.
Mic/Line Inputs
Two microphone or line-level analog audio signals
can be connected to the Model 5205’s 3-pin female
XLR connectors. The preamplier gain of each chan-
nel can be independently adjusted from among six
settings: 0 (line), 20, 30, 40, 50, or 60 dB. To support
condenser microphones P48 phantom power can be
independently selected as required for each channel.
Figure 1. Model 5205 Mic/Line to Dante Interface front and rear views

Issue 5, December 2023 Model 5205 User Guide
Page 6 Studio Technologies, Inc.
Model 5205
MIC/LINE TO DANTE INTERFACE
LEDs are provided to display the conguration of the
gain and P48 phantom power functions.
Six pushbutton switches, located on the Model 5205’s
front panel, allow local selection of the preamplier
gain and P48 phantom power on/off status. The
STcontroller application allows personal computer
users to both view and change the gain of the pre-
ampliers and the on/o󰀨 status of the P48 phantom
power sources.
Audio Quality
The Model 5205’s audio performance is very good.
The low-noise, wide dynamic-range preamplifier
circuitry ensures that input audio quality is pre-
served. The outputs of the preampliers are routed
to high-performance analog-to-digital conversion
(ADC) sections that support sampling rate of 44.1, 48,
88.2, and 96 kHz with a bit depth of 24. A precision
voltage-reference integrated circuit supports the ADC
circuitry in performing accurate signal conversion.
The audio signals, now in the digital domain, are con-
nected to the Dante interface section where they are
packetized and prepared for transport over Ethernet.
The P48 phantom power source is extremely low
noise, providing microphone power while causing little
signal degradation. This is important for demanding
applications.
The mic/line inputs were carefully designed for use in
permanent, as well as portable and eld, applications.
Extensive ltering minimizes the chance that radio
frequency (RF) energy will interfere with the audio
input signals. Other components were included to
specically address ESD (“static”) situations, helping
to ensure long-term reliable operation.
Metering
Two 8-step LED meters provide a real-time level
indication of the two Dante transmitter (output) chan-
nels. Scaled in dBFS (decibels referenced to full scale
digital) the meters offer a direct view of the audio
signal levels as they are transported via Dante in
the digital domain. This is important as optimal audio
performance requires transporting signals at their
proper levels — without an accurate indication this
can be di󰀩cult to achieve.
Ethernet Data and PoE
The Model 5205 connects to an Ethernet data net-
work using a standard 100 Mb/s twisted-pair Ethernet
interface. The physical interconnection is made by
way of a Neutrik
®
etherCON RJ45 connector. While
compatible with standard RJ45 plugs, etherCON
allows a ruggedized and locking interconnection for
harsh or high-reliability environments. An LED dis-
plays the status of the network connection.
The Model 5205’s operating power is provided
by way of the Ethernet interface using the 802.3af
Power-over-Ethernet (PoE) standard. This allows
fast and e󰀩cient interconnection with the associated
data network. To support PoE power management,
the Model 5205’s PoE interface reports to the power
sourcing equipment (PSE) that it’s a class 2 (low
power) device. An LED is provided to indicate when
power is being supplied to the Model 5205.
Dante Audio-over-Ethernet
Audio data is sent from the Model 5205 using the
Dante Audio-over-Ethernet media networking tech-
nology. As a Dante-compliant device, the Model
5205’s two transmitter (output) audio channels can be
assigned to other devices using the Dante Controller
software application. The bit depth is 24 and sample
rates of 44.1, 48, 88.2, and 96 kHz are supported.
Two bi-color LEDs provide an indication of the Dante
connection status.
The Model 5205 is compliant with the AES67 interop-
erability standard. In addition, the unit is compatible
with the Dante Domain Manager™ (DDM) software
application.
Future Capabilities and Firmware
Updating
The Model 5205 was designed so that its capabilities
and performance can be enhanced in the future. A
USB connector, located on the unit’s back panel,
allows the application rmware (embedded software)
to be updated using a USB ash drive.
To implement the Dante interface the Model 5205
uses Audinate’s UltimoX2™ integrated circuit. The
rmware in this integrated circuit can be updated via
the Ethernet connection, helping to ensure that its
capabilities remain up to date.

Model 5205 User Guide Issue 5, December 2023
Studio Technologies, Inc. Page 7
Model 5205
MIC/LINE TO DANTE INTERFACE
Getting Started
What’s Included
Included in the shipping carton will be a Model 5205
Mic/Line to Dante interface and instructions on how
to obtain an electronic copy of this guide. As a device
that is Power-over-Ethernet (PoE) powered, no exter-
nal power source is provided. Should a PoE midspan
power injector be required it must be purchased
separately.
Mounting Options
There is no provision for directly mounting one or more
Model 5205 units in an equipment rack. However, the
overall height of the unit was carefully selected so that
it could be placed without interference on a single
space (1U) rack shelf. The Model 5205’s enclosure
width allows up to four units to be placed side-by-side
on a 1U shelf that’s mounted in a standard 19-inch
equipment rack. Hook-and-loop (“Velcro”) tape can
be used to secure the Model 5205 units to the shelf.
A set of mounting brackets is available to allow a
Model 5205 to be attached to the underside of a desk,
table, broadcast set, or other at surface. The order
code for this item is MBK-02.
Connections
In this section, signal interconnections will be made
using the connectors located on the back panel of
the Model 5205. An Ethernet data connection with
Power-over-Ethernet (PoE) capability will be made
using either a standard RJ45 patch cable or an
etherCON protected RJ45 plug. Microphone or
line-level signal sources will be connected using two
cable-mounted 3-pin male XLR connectors.
Ethernet Connection
A 100BASE-TX Ethernet connection that supports
Power-over-Ethernet (PoE) is required for Model
5205 operation. This one connection will provide
both the Ethernet data interface and power for the
Model 5205’s circuitry. A 10BASE-T connection is
not su󰀩cient and a 1000BASE-T (GigE) connection
is not supported unless it can automatically “fall
back” to 100BASE-TX operation. For PoE-supporting
Ethernet switch power management the Model 5205
will enumerate itself as a PoE class 2 device.
The Ethernet connection is made by way of a Neutrik
etherCON protected RJ45 connector that is located
on the back panel of the Model 5205. This allows
connection by way of a cable-mounted etherCON
plug or a standard RJ45 plug. The Model 5205’s
Ethernet interface supports auto MDI/MDI-X so that
most cabling implementations will be correctly sup-
ported without requiring a “cross-over” or “reversing”
cable.
Ethernet Port without PoE
As previously discussed, the Model 5205 was
designed such that the Ethernet connection will
provide both data and Power-over-Ethernet (PoE)
power. There may be situations where the associat-
ed Ethernet switch does not provide PoE power. In
these cases an external PoE midspan power injector
can be used. As long as the midspan power injector
is 802.3af-compatible it should function correctly.
Midspan units are available from a variety of sources,
including Studio Technologies.
Mic/Line Inputs
The two mic/line inputs are intended for connec-
tion with balanced microphone or line-level analog
audio signal sources. Typically these sources will be
associated with professional audio equipment such
as dynamic, condenser, or ribbon microphones,
audio consoles, video storage and playback systems,
wireless microphone receivers, and audio testing
equipment.
The Model 5205 provides two 3-pin female XLR
connectors for interfacing analog audio signals with
the mic/line inputs. For balanced signals pin 2 should
be connected to signal + (high) and pin 3 should be
signal – (low). Pin 1 should be connected to the shield
of the interconnecting cable.
Unbalanced signals can also be connected. In most
cases signal + (high) should be connected to pin 2
and common/shield should be connected to both pins
1 and 3 of the 3-pin male XLR mating connector. If
this connection arrangement results in hum or noise
it may be e󰀨ective to try connecting signal + (high) to
pin 2 and signal common/shield only to pin 3.

Issue 5, December 2023 Model 5205 User Guide
Page 8 Studio Technologies, Inc.
Model 5205
MIC/LINE TO DANTE INTERFACE
Dante Conguration
Several Model 5205’s Dante-related parameters
can be configured. These configuration settings
will be stored in non-volatile memory within the
Model 5205’s circuitry. Conguration will typically be
done with the Dante Controller software applica-
tion which is available for download free of charge
at audinate.com. Versions of Dante Controller are
available that include support for the Windows
®
and
macOS
®
operating systems. The Model 5205 uses
the UltimoX2 2-input/2-output integrated circuit to
implement the Dante architecture. However, only the
two transmitter (output) channels are utilized. This dic-
tates which parameters can be congured and what
choices are available. The Model 5205 is compatible
with AES67 and the Dante Domain Manager™ (DDM)
software application. AES67 operation requires that a
setting within Dante Controller be enabled. For DDM
operation please refer to the specic DDM documen-
tation for details on what Model 5205 and related
parameters may have to be congured.
The two transmitter (output) channels associated with
the Model 5205’s Dante interface must be assigned
to the desired receiver (input) channels. Within Dante
Controller a “subscription” is the term used for routing
a transmitter ow (a group of output channels) to a
receiver ow (a group of input channels). The num-
ber of transmitter ows associated with an UltimoX2
integrated circuit is limited to two. These can either
be unicast, multicast, or a combination of the two.
(Note that when operating in the AES67 mode, the
Dante transmitter (output) channels will function only
in multicast; unicast is not supported.)
The Model 5205 will support audio sample rates of
44.1, 48, 88.2, and 96 kHz with a limited selection of
pull-up/pull-down values. The Model 5205 can serve
as the Leader clock for a Dante network but in most
cases it will be congured to “sync” to another device.
The Model 5205 has a default Dante device name of
ST-M5205 and a unique su󰀩x. The su󰀩x identies
the specic Model 5205 that is being congured. The
su󰀩x’s actual alpha and numeric characters relate to
the MAC address of the UltimoX2 integrated circuit.
The two Dante transmitter (output) channels have de-
fault names of Ch1 and Ch2. Using Dante Controller
the default device name and channel names can be
revised as appropriate for the specic application.
The Model 5205 can be configured for AES67
operation. This requires the AES67 Mode to be set
for Enabled. By default, AES67 mode is set for Dis-
abled. As previously mentioned, in the AES67 mode
the Dante transmitter (output) channels will function
in multicast; unicast is not supported.
Operation
At this point an Ethernet connection with
Power-over-Ethernet (PoE) capability should have
been made. The Model 5205’s Dante conguration
settings should have been selected using the Dante
Controller software application. At a minimum the two
Dante transmitter (output) channels should have been
routed to receiver (input) channels on an associated
device. Analog signal sources should have been
connected to the two mic/line inputs. Normal Model
5205 operation can now begin.
Initial Operation
The Model 5205 will begin to function as soon as
a Power-over-Ethernet (PoE) power source is con-
nected. However, full operation may take 20 seconds
or longer to begin. Upon initial power up the four
status LEDs located on the back panel will begin to
light. The USB LED on the back panel and the P48,
gain, and meter LEDs on the front panel will light in
a test sequence. After the LEDs complete their test
sequence one LED associated with the level meter
for channel 1 and one LED associated with the level
meter for channel 2 will briey light to indicate the
version number of the unit’s application firmware
(embedded software). (Understanding how to “read”
the application rmware number will be discussed in
detail later in this guide.) Once the entire sequence
has completed and the Dante connection has been
established full operation will begin.
Ethernet, PoE, and Dante Status
LEDs
Four status LEDs are located below the etherCON
connector on the Model 5205’s back panel. The
PoE LED will light green to indicate that Power-
over-Ethernet (PoE) power associated with the con-
nected Ethernet signal is providing operating power
for the Model 5205. The LINK/ACT LED will light
green whenever an active connection to a 100 Mb/s
Ethernet network has been established. It will ash
in response to Ethernet data packet activity. The

Model 5205 User Guide Issue 5, December 2023
Studio Technologies, Inc. Page 9
Model 5205
MIC/LINE TO DANTE INTERFACE
SYS and SYNC LEDs display the operating status
of the Dante interface and associated network. The
SYS LED will light red upon Model 5205 power up to
indicate that the Dante interface is not ready. After
a short interval it will light green to indicate that it is
ready to pass data with another Dante device. The
SYNC LED will light red when the Model 5205 is not
synchronized with a Dante network. It will light solid
green when the Model 5205 is synchronized with a
Dante network and an external clock source (timing
reference) is being received. It will slowly ash green
when the Model 5205 is part of a Dante network and
is serving as a Leader clock.
How to Identify a Specic
Model 5205
The Dante Controller software application o󰀨ers an
identify command that can be used to help locate a
specic Model 5205. When identify is selected for a
specic unit its meter LEDs will light in a unique pat-
tern. In addition, the SYS and SYNC LEDs, located
directly below the etherCON connector on the back
panel, will slowly ash green. After a few seconds
the LED identication patterns will cease and normal
Model 5205 level meter and Dante status LED oper-
ation will again take place.
Level Meters
Two 8-step LED meters display the level of the two
Dante transmitter (output) channels. The meter steps
are calibrated in dBFS which indicates the number of
dB below the maximum possible digital signal level.
The maximum level, 0 dBFS, is the digital audio refer-
ence level equal to “full scale.” Full scale refers to the
maximum level possible for a sine wave before “digital
clipping.” In typical applications a signal with a nominal
(normal) level of –20 dBFS would be desirable. The
ve meter steps that have a threshold of –20 dBFS
and less light with the color green. The steps that light
at –15 and –10 dBFS are yellow in color and indicate
“hot” or above average signal levels. The top step
lights red in color when a signal level is –5 dBFS or
greater, indicating that a potentially “clipped” (distorted
due to excessive level) signal is present.
Mic/Line Inputs
Two 3-pin female XLR connectors are provided to
interface analog audio signals with the Model 5205’s
mic/line inputs. Balanced and unbalanced signals with
a wide range of nominal levels can be successfully
connected.
As expected, a signal connected to the channel 1
mic/line input connector is associated with Dante
transmitter (output) channel 1. A signal connected to
the channel 2 mic/line input connector is associated
with Dante transmitter (output) channel 2.
Preamplier Gain Selection
Two pushbutton switches are associated with each
mic/line input and are used to locally adjust the gain
of the preamplier circuitry. In the 0 dB (line) position
the Model 5205 will provide no (unity) gain. In this
specic case, a connected analog signal that has a
level of precisely 0 dBu will result in a Dante digital
audio level of –20 dBFS. (That corresponds to 20 dB
less than the maximum possible level.) Five other
settings allow a gain of 20 to 60 dB, in 10-dB steps,
to be selected.
Select the preamplifier gain such that normal in-
put signals will cause the ve green LEDs to light.
Peak signals can cause the yellow LEDs to light on
occasion. But the yellow LEDs should never be con-
tinuously lit. The red LED should never light, except
possibly in the case of an extreme peak. The red LED
lighting on a regular basis indicates that the signal
level is at risk of reaching digital 0 (0 dBFS) which is
destructive to audio quality.
When changing from the 0 dB to the 20 dB gain
setting, or vice-versa, a slight mechanical click
or “tick” sound may be heard coming from with-
in the Model 5205’s enclosure. This is caused
by the changing state of an electro-mechanical
relay that places a 20 dB attenuator network in to or
out of the signal path.
Note that due to a technical consideration the exact
gain values are slightly different from the nominal
values that are indicated on the front-panel graphics
and in most of the text provided in this guide. As such,
there can be up to a 1-dB di󰀨erence, high or low, at
some gain settings. This will typically have no impact
on the performance or use of the Model 5205. Lab-
oratory or other precision testing of the Model 5205
will show these apparent anomalies. Refer to the
Specications section for the exact values.

Issue 5, December 2023 Model 5205 User Guide
Page 10 Studio Technologies, Inc.
Model 5205
MIC/LINE TO DANTE INTERFACE
P48 Phantom Power
To support microphones that require external power,
the Model 5205 can provide a source of P48 phan-
tom power. Press the P48 button associated with the
desired channel to locally change the on/o󰀨 status of
the P48 phantom power source. The P48 LED will
light when P48 phantom power is being provided to
the associated mic/line input connector. For maxi-
mum exibility P48 phantom power is available in all
six of the preamplier gain settings, including 0 dB
(line). While P48 phantom power would not typically
be needed in the 0 dB (line) setting it’s still available
for special applications. This can include use with
high-sensitivity microphones being used in environ-
ments with high-SPL audio levels.
Remote Conguration of Gain and
P48 Phantom Power
Using the STcontroller application allows personal
computer users to view and adjust the Model 5205’s
preamplifier gain and P48 phantom power on/off
status. The application is available for download on
the Studio Technologies’ website (studio-tech.com).
Versions are available that support the Windows and
macOS operating systems. Changes made using the
application will be displayed in real-time on the Model
5205’s LED indicators. Changes made to the pre-
amplier gain and P48 on/o󰀨 status using the Model
5205’s local pushbutton switches will be displayed in
STcontroller.
Button Lock-Out
There may be situations where it’s desirable for the
preamplifier gain and P48 phantom power on/off
congurations to be maintained without the risk that
an unauthorized user will press one of the buttons
and cause an unwanted change to be made. A button
lock-out function is included to minimize the chance
that this will occur. Using the function is very simple:
simultaneously press and hold both P48 buttons for
approximately 2 seconds until the two P48 LEDs ash.
This will indicate that a change has been made to the
button lock-out status.
When the button lock-out function is enabled the six
pushbuttons will no longer allow any local preamplier
gain or P48 conguration changes to be made. During
operation, if the buttons are “locked” pressing a P48,
gain up, or gain down button will cause both P48
LEDs to ash three times but no change will occur.
Only by changing the status of the lock-out function,
by pressing and holding both P48 buttons, will local
changes to the gain or P48 on/o󰀨 status be allowed.
Remote monitoring and control using the STcontroller
application will continue to function normally, even if
the buttons are in their locked-out state.
Conguration Storage
The selected conguration of the preamplier gain and
P48 on/o󰀨 status, as well as the button lock-out status,
will be stored in nonvolatile memory within the Model
5205. This allows the settings to be “remembered”
during periods when the Model 5205 is not being
provided with power. Upon the unit being powered
up the stored settings will again be used.
USB Interface
A USB type A connector and associated status LED
is located on the back panel of the Model 5205. This
data interface is used only for updating the unit’s ap-
plication rmware. No audio data of any kind will pass
through it. For details please refer to the Technical
Notes section.
Technical Notes
IP Address Assignment
By default the Model 5205’s Ethernet interface will
attempt to obtain an IP address and associated set-
tings using DHCP (Dynamic Host Conguration Pro-
tocol). If a DHCP server is not detected an IP address
will be assigned using the link-local protocol. This
protocol is known in the Microsoft
®
world as Automatic
Private IP Addressing (APIPA). It is also sometimes
referred to as auto-IP (PIPPA). Link-local will assign
an IP address in the IPv4 range of 169.254.0.1 to
169.254.255.254. In this way, multiple Dante-enabled
devices can be connected together and automatically
function, whether or not a DHCP server is active on
the LAN. Even two Dante-enabled devices that are
directly interconnected using an RJ45 patch cord will
correctly acquire IP addresses and be able to com-
municate and transport audio.
Using the Dante Controller software application, the
Model 5205’s IP address and related network parame-
ters can be set for a xed (“static”) conguration. While
this is more involved than letting DHCP or link-local

Model 5205 User Guide Issue 5, December 2023
Studio Technologies, Inc. Page 11
Model 5205
MIC/LINE TO DANTE INTERFACE
“do their thing,” if xed addressing is necessary then
that capability is available. In this case, it’s highly
recommended that each unit be physically marked,
e.g., directly using a permanent marker or “console
tape,” with its specic IP address. If knowledge of a
Model 5205’s IP address has been misplaced there
is no reset button or other method to restore the unit
to a default IP setting.
In the unfortunate event that a device’s IP address is
lost, the Address Resolution Protocol (ARP) network-
ing command can be used to “probe” devices on a
network for this information. For example, in Windows
OS the arp –a command can be used to display a list
of LAN information that includes MAC addresses and
corresponding IP addresses. The simplest means of
identifying an unknown IP address is to create a “mini”
LAN with a personal computer connected directly to
the Model 5205. Then by using the appropriate ARP
command the required “clues” can be obtained.
For best Dante audio-over-Ethernet performance a
network that supports VoIP QoS capability is rec-
ommended. This can typically be implemented on
virtually all contemporary managed Ethernet switch-
es. There are even specialized switches that are
optimized for entertainment-associated applications.
Refer to the Audinate website (audinate.com) for
details on optimizing networks for Dante applications.
Application Firmware Version
Display
As part of the Model 5205’s power-up sequence
the unit’s application firmware version number is
displayed. This is useful when working with factory
personnel on application support and troubleshoot-
ing. The eight LEDs associated with the channel 1
level meters are used to display the major version
number with a range of 1 through 8. The eight LEDs
associated with the channel 2 level meters are used to
display the minor version number which ranges from
1 through 8. Refer to Figure 2 for a detailed view of
the LEDs and the corresponding application rmware
version numbering scheme.
Application Firmware Update
Procedure
It’s possible that updated versions of the application
firmware (embedded software) that is utilized by
the Model 5205’s microcontroller (MCU) integrated
circuit will be released to add features or correct
issues. Refer to the Studio Technologies’ website for
the latest application rmware le. The unit has the
Figure 2. Detail of front panel showing the level meter LEDs that display the application
rmware version. In this example, the application rmware version shown is 2.3.
Major Version Minor Version
Number Number
O8 .8 O
O7 .7 O
O6 .6 O
O5 .5 O
O4 .4 O
O3 .3 l
l2 .2 O
O1 .1 O

Issue 5, December 2023 Model 5205 User Guide
Page 12 Studio Technologies, Inc.
Model 5205
MIC/LINE TO DANTE INTERFACE
ability to load a revised le into the MCU’s nonvola-
tile memory by way of a USB interface. The Model
5205 implements a USB host function that directly
supports connection of a USB ash drive. The Model
5205’s MCU updates its rmware using a le named
m5205.bin.
The update process begins by preparing a USB ash
drive. The ash drive doesn’t have to be empty (blank)
but must be in the personal-computer-standard FAT32
format. Save the new rmware le in the root folder
with a name of m5205.bin. Studio Technologies
will supply the application rmware le inside a .zip
archive le. While the rmware le inside of the zip le
will adhere to the naming convention required by the
Model 5205, the name of the zip le itself will include
the le’s version number. For example, a le named
m5205v2r3MCU.zip would indicate that version 2.3
of the application rmware (m5205.bin) is contained
within this zip le. Once the USB ash drive is insert-
ed into the USB interface, the unit powered o󰀨 and
again powered on, the le will automatically load. The
precise steps required will be highlighted in the next
paragraphs. After the rmware has been updated the
two LED level meters should be used to conrm that
the desired application rmware version has been
successfully installed.
To install the application rmware le follow these
steps:
1. Remove power from the Model 5205. This will entail
removing the Ethernet connection that is providing
PoE power.
2. Ensure that nothing is present in the USB port.
Then again apply power to the unit and “read”
the currently loaded application rmware version
during the power-up sequence using the two level
meters. (Refer to the Application Firmware Version
Display paragraph earlier in this section.) Record
the version number for later reference.
3. Remove power from the Model 5205.
4. Insert the prepared USB ash drive into the Model
5205’s USB port, located on the back panel of the
unit.
5. Apply power to the Model 5205. Power is provided
by Power-over-Ethernet (PoE) associated with the
connected Ethernet signal.
6. The Model 5205 will run a “boot loader” program
that will immediately load the new application
rmware le (m5205.bin). This process takes only
a few seconds. During this time period the LED
located below the USB connector will ash slowly
on and o󰀨 green. Once the entire loading process is
over, taking approximately 10 seconds, the Model
5205 will restart using the newly loaded application
rmware.
7. At this time the Model 5205 is functioning with the
newly loaded application rmware and the USB
ash drive can be removed. But to be conservative,
remove power rst and then remove the USB ash
drive.
8. Apply power to the Model 5205 and “read” the
application rmware version number by observing
the two level meters. Ensure that this is the desired
version and that it’s different from that noted in
step 2. Note that upon power being applied to the
Model 5205 if the USB ash drive doesn’t have the
correct le (m5205.bin) in the root folder no harm
will occur. Upon power up the USB LED will ash
on and o󰀨 rapidly for a few seconds to indicate this
condition and then normal operation using the unit’s
existing application rmware will begin.
UltimoX2 Firmware Update
As previously discussed, the Model 5205 implements
Dante connectivity using the 2-input/2-output UltimoX2
integrated circuit from Audinate. The Dante Controller
software application can be used to determine the
version of the rmware (embedded software) residing
in the UltimoX2 “chip.” This rmware can be updated
by way of the Model 5205’s Ethernet connection. The
latest Dante rmware le is available on the Studio
Technologies’ website. The Dante Firmware Update
Manager application is used to install the rmware.
This program is also available for download on the
Studio Technologies’ website.

Model 5205 User Guide Issue 5, December 2023
Studio Technologies, Inc. Page 13
Model 5205
MIC/LINE TO DANTE INTERFACE
Specications
Network Audio Technology:
Type: Dante Audio-over-Ethernet
AES67-2018 Support: yes, selectable on/o󰀨
Dante Domain Manager (DDM) Support: yes
Bit Depth: 24
Sample Rates: 44.1, 48, 88.2, and 96 kHz
Number of Dante Transmitter (Output)
Channels: 2
Dante Audio Flows: 2 transmitter
Analog to Digital Equivalence: a +4 dBu input
with 0 dB gain selected results in a Dante digital
output level of –20 dBFS
Network Interface:
Type: twisted-pair Ethernet with Power-over-
Ethernet (PoE)
Data Rate: 100 Mb/s (10 Mb/s Ethernet not
supported)
Power: Power-over-Ethernet (PoE) per IEEE
802.3af class 2 (low power, ≤6.49 watts)
General Audio Parameters:
Frequency Response (48 kHz Sample Rate):
+0.0/–0.5 dB, 20 Hz to 22 kHz
Frequency Response (96 kHz Sample Rate):
+0.0/–0.5 dB, 20 Hz to 40 kHz
Distortion (THD+N): 0.001% (–100 dB) at
–1 dBFS, 40 dB gain, 22 kHz bandwidth
Dynamic Range: >114 dB, 0 dB gain, A-weighted
EIN: –123 dBu, 22 kHz bandwidth, 60 dB gain,
150 ohm source resistance
IMD (SMPTE): <0.002%, 60 Hz/7 kHz, 4:1,
–20 dBFS
Mic/Line Inputs: 2
Type: electronically balanced
Input Impedance: 3.7 k ohms
CMRR: >75 dB, 20 Hz to 22 kHz, 40 dB gain
Preamplier Gain, Nominal: 0 (line), 20, 30, 40,
50, and 60 dB
Preamplier Gain, Actual: 0 (line), 19, 31, 40, 49,
and 61 dB
Compatibility: dynamic, ribbon, or phantom-
powered mics
Phantom Power: P48 per IEC 61938 standard,
+45 volts DC nominal, on/o󰀨 selectable
Remote Conguration Capability: preamplier
gain and P48 phantom power on/o󰀨 status (uses
STcontroller application)
Meters: 2
Function: displays level of Dante transmitter
(output) signals
Type: 8-segment LED, modied VU ballistics
Connectors:
Mic/Line Inputs: 3-pin female XLR
Ethernet: Neutrik etherCON RJ45
USB: type A receptacle
Dimensions (Overall):
4.2 inches wide (10.7 cm)
1.7 inches high (4.3 cm)
5.1 inches deep (13.0 cm)
Mounting Option: MBK-02 Mounting Bracket Kit
Weight: 0.8 pounds (0.35 kg)
Specications and information contained in this
User Guide subject to change without notice.