Studio Technologies 354 User manual

50293-0821, Issue Preliminary 1
Copyright © 2021 by Studio Technologies, Inc., all rights reserved
studio-tech.com
User Guide
Issue Preliminary 1. August 2021
This User Guide is applicable for serial numbers
M354-00151 and later with Application Firmware 1.00 and later
Model 354
Talk Station

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Model 354
TALK STATION
Table of Contents
Revision History ...................................................................................................................... 4
Introduction ............................................................................................................................. 5
Getting Started ........................................................................................................................ 8
Dante Configuration ................................................................................................................10
Model 354 Configuration .........................................................................................................11
Operation ................................................................................................................................16
Technical Notes .......................................................................................................................16
Specifications ..........................................................................................................................19
Appendix A–STcontroller Default Configuration Values ......................................................... 21

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TALK STATION
Revision History
Issue Preliminary, August 2021:
• Initial preliminary release.

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TALK STATION
Introduction
The Model 354 Talk Station is a unique product
intended to support a variety of voice paging, back-
ground music, audio-file playback, broadcast talent
cueing (IFB), and general audio applications. The
unit supplies four independent “talk” channels that
can be individually configured to match the needs of
an application. A simple monitor section allows one
of the four Dante® receiver (input) channels to be
routed as desired to a connected amplifier or ampli-
fied speaker.
The Model 354 supports Dante audio-over-Ethernet
digital media technology with AES67 compatibility
for integration into contemporary applications. In ad-
dition, the unit is compatible with the Dante Domain
Manager™ (DDM) software application.
Voice audio is supplied by way of a gooseneck
microphone, purchased separately, which is attached
to the connector/threaded bushing combination that
is located on the front of the Model 354. (Using the
Studio Technologies’ GME-3-12 Gooseneck is highly
recommended.) Two audio sources or “messages,”
up to 40 seconds each in length, are stored in non-
volatile memory within the Model 354. These two
audio sources, saved in the common 16-bit monoau-
ral WAV format, can be easily updated by way of a
standard USB flash drive. The audio files can contain
whatever “pre-page” (preamble) audio signals that are
desired to support an application. They could be the
sound of natural bells or chimes, an “electronically
created” audio sequence, or a voice message. By
using WAV files, the desired sources can be created
outside of the Model 354 and then easily loaded for
use. Configuration choices determine how and when
the preamble audio files will be played.
The Model 354 is extremely simple to deploy, is “pro”
quality throughout, and provides an intuitive user ex-
perience. The Model 354’s audio quality is excellent,
with low distortion, low noise, and ample headroom.
Careful circuit design and rugged components ensure
long, reliable operation. Only a Power-over-Ethernet
(PoE) connection and attachment of a gooseneck
microphone are required for operation. If desired, the
analog monitor output can be connected to the input of
an associated device. Two “custom” WAV audio files
can be loaded by way of a USB flash drive.
Figure 1. Model 354 Talk Station front
and back views
Model 354 operating features are configured using the
STcontroller software application. An extensive set of
parameters allows the unit’s functions to be tailored
to meet the needs of many, many applications.
STcontroller is a fast and simple means of confirm-
ing and revising the unit’s operating parameters. The
Model 354 is housed in a compact, rugged steel en-
closure that’s intended for table-top use. Its small size
makes it ideal for applications in space-constrained
locations.
Applications
For theater or live-event spaces the Model 354 can be
a complete solution for providing up to four channels
of background audio with voice paging and preamble
audio capability. Pre-recorded “tones” or “chimes” can
be configured to play prior to voice audio be presented
to one or more of the outputs. The unit could be
located in a box office or manager’s office location.

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Broadcast applications can utilize the Model 354 to
create a simple 4-channel talent cue (IFB) master
station. “Program” audio sources can be routed to
the unit’s Dante receiver (input) channels and then
interrupted with gooseneck microphone audio as
desired.
Deployment of Dante applications could benefit from
the unit’s ability to store and playback WAV audio
files. Test messages could be created in WAV format
and then loaded into the Model 354 for continuous
playback during system commissioning.
Security or management personnel could use the
Model 354 as a combination voice paging console
and monitor resource. Audio from the gooseneck
microphone could be immediately routed to up to
four Dante transmitter (output) channels. The monitor
section allows a Dante source to be monitored using
a connected amplifier or amplified speaker.
The range of resources provided by the Model 354
also makes it suitable for use in many other applica-
tions. It’s designed to support the needs of varied
applications across a wide range of audio system
designs. The unit is intended to provide a “palette” of
resources that meet real-world needs, allowing great
things to be accomplished rather than presenting
limitations that dictate what can and can’t be done.
Setup and Operation
Set up, configuration, and operation of the Model
354 is simple. An RJ45 jack is used to interconnect
with a standard twisted-pair Ethernet port associated
with a PoE-enabled network switch. This connection
provides both power and bidirectional digital audio. A
gooseneck microphone is attached using the ¼-inch
plug with integrated threaded bushing. The Studio
Technologies’ GME-3-12 Gooseneck Microphone is
available as an option and will perform very well with
the Model 354. A 3-pin male XLR connector provides
access to the analog monitor output. This would
typically be connected to the input on an amplified
loudspeaker. The STcontroller software application
is used to configure the wide range of Model 354
operating parameters. This allows the unit’s perfor-
mance to be optimized to meet the needs of specific
applications.
The user is presented with four pushbutton switches
and a push-in/push-out rotary level potentiometer. The
pushbutton switches are lighted with dual-color LEDs
to clearly present the unit’s operating status. The
monitor output (available in both analog and Dante
digital formats) can assist the user in confirming the
current audio operation.
Ethernet Data and PoE
The Model 354 connects to a local area network
(LAN) by way of a 100 Mb/s twisted-pair Ethernet
interface. The unit’s physical 100BASE-TX intercon-
nection is made by way of a Neutrik® etherCON®
RJ45 jack. While compatible with standard RJ45
plugs, etherCON allows a ruggedized and locking
interconnection for harsh or high-reliability environ-
ments. The Model 354’s operating power is provided
by way of the Ethernet interface using the 802.3af
Power-over-Ethernet (PoE) standard. This allows
fast and efficient interconnection with the associated
data network. To support PoE power management,
the Model 354’s PoE interface enumerates (reports)
to the power sourcing equipment (PSE) that it’s a
class 1 (very low power) device.
Dante Audio-over-Ethernet
Audio data is sent to and received from the Model
354 using the Dante audio-over-Ethernet media net-
working technology. As a Dante-compliant device, the
Model 354’s four Dante transmitter (output) channels
Figure 2. Model 354 Talk Station shown with
optional GME-3-12 Gooseneck Microphone

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and four Dante receiver (input) channels can be as-
signed (routed or “subscribed”) to other devices using
the Dante Controller software application. The Dante
transmitter (output) and receiver (input) channels are
limited to supporting four Dante flows, two in each
direction. The digital audio’s bit depth is up to 32 with
a sampling rate of 48 kHz. Two bi-color LEDs provide
an indication of the Dante connection status. An ad-
ditional LED displays the status of the associated
Ethernet connection.
The Model 354 is compatible with the AES67 inter-
operability standard. When configured in Dante Con-
troller to support AES67, the unit’s two transmitter
(output) channels will function in multicast; unicast
is not supported. In addition, the Model 354 is com-
patible with the Dante Domain Manager™ (DDM)
software application.
Audio Quality
The Model 354 provides excellent audio performance.
A low-noise, wide dynamic-range microphone pre-
amplifier and associated voltage-controlled-amplifier
(VCA) dynamics controller (compressor) ensures that
gooseneck microphone audio quality is preserved
while minimizing the chance of signal overload. The
output of the microphone preamp and compressor is
routed to an analog-to-digital conversion (ADC) sec-
tion that supports a sampling rate of 48 kHz with a bit
depth of up to 32.
As previously discussed, the Model 354 can store and
replay two audio files. These uncompressed PCM
audio signals utilize the high-quality 16-bit, monaural,
WAV format.
Audio sources can arrive in the Model 354 by way of
four Dante receiver (input) channels. The supported
sampling rate is 48 kHz with a bit depth of up to 32.
These signals pass into the Model 354’s 32-bit micro-
controller integrated circuit and can be used as part of
background music or talent cue channels. They can
also be used in conjunction with the analog and Dante
monitor output functions. The source selected for the
analog monitor output is sent to a high-performance
digital-to-analog (DAC) integrated-circuit converter
and then on to robust balanced (differential) output
circuitry. The analog monitor output is protected from
connection with low-voltage DC, ESD (“static”), and
other potentially damaging transients.
The audio content of the Dante transmitter (output)
channels will consist of, depending on the unit’s
configuration and operating state, a combination of
gooseneck microphone, WAV audio file, and audio
input sources. The signals remain in the digital domain
and route through the 32-bit logic circuitry and on to
the Dante interface section where it is packetized and
prepared for transport over Ethernet.
Configuration Flexibility
The Model 354 can easily be configured to meet
the needs of many specific applications and user
preferences. All configuration choices are performed
using the STcontroller software application. Versions
of STcontroller are available to support the WinOS®
and macOS® operating systems. Selectable con-
figurable parameters include microphone preamplifier
gain, WAV file level trim, LED indicator intensity and
actions, and monitor output source selection and op-
eration. In addition, each of the four output functions
can be optimized from the six available configuration
choices. These choices allow the unit to be configured
to support voice page, talent cueing (IFB), and other
specialized applications.
As previously described, the functions associated with
the four pushbutton switches and output channels can
be individually configured. As an example, for a voice
page application three of the output channels might
be configured to utilize a background music source
and play, before the microphone is active, a pre-page
message. The fourth output channel might be used
as a voice-page output with no background music of
pre-page audio. The four pushbutton switches would
typically be configured to provide a momentary (push
to activate) function.
Red and green LEDs are associated with the unit’s
four pushbutton switches. When lit singly they will
provide a red or green indication. When both are lit
simultaneously, they will provide an orange indication.
A configuration choice allows selection of how the
LEDs will light under various operating conditions.
This capability is provided to assist users who have
trouble observing the differences between colors,
typically issues differentiating between red and green.
The “color blindness” condition is not uncommon in
men and can make effective use of some electronic
equipment difficult. The Model 354’s ability to control
the pushbutton colors can also be useful for support-

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TALK STATION
ing international applications where compliance to
specific regulatory requirements is required. This may
dictate which LED color is associated with a function
being “on” and which color is associated with a func-
tion being “off.”
The four Dante receiver (input) audio sources and the
way in which they are assigned to the monitor outputs
can be configured from among five choices. These
unique choices allow a number of audio monitoring
situations to be implemented. Whether for use in
voice paging, talent cueing (IFB), or other audio ap-
plications, the Model 354 should be able to achieve
the desired configuration. Several special functions
allow the WAV files and gooseneck microphone audio
to be routed to the monitor outputs. Configurable us-
ing STcontroller, these functions can allow a user to
hear confirmation audio related to the unit’s real-time
operation.
Future Capabilities and Firmware
Updating
The Model 354 was designed so that its capabilities
and performance can be enhanced in the future. The
unit implements a USB host function which allows
the application firmware (embedded software) to be
updated using a standard USB flash drive. And, as
previously discussed, the USB receptacle is also
used to load WAV audio files that can be stored on
the same USB flash drive. The Model 354 uses the
Audinate UltimoX4™ integrated circuit to implement
its Dante interface. The firmware in this integrated
circuit can be updated via the Ethernet connection,
helping to ensure that the unit’s capabilities remain
up to date.
Getting Started
What’s Included
Included in the shipping carton is a Model 354 Talk
Station unit along with instructions on how to obtain
an electronic copy of this guide. As the Model 354
is Power-over-Ethernet (PoE) powered, no external
power source is provided. In almost all cases, a
microphone, supplied separately, will be connected
to the Model 354. Studio Technologies recommends
using its GME-3-12 Gooseneck Microphone which
will provide excellent performance. The GME-3-12
is purchased separately and will be shipped in a
separate carton.
Connections
In this section signal interconnections will be made
using the connectors located on the back and front
of the Model 354’s enclosure. One Ethernet connec-
tion will be made using either a standard RJ45 patch
cable or an etherCON protected RJ45 plug. The unit’s
Ethernet interface requires connection of a signal that
supports Power-over-Ethernet (PoE). In most cases,
an electret-powered gooseneck microphone that
has an integrated 1/4-inch plug will be connected to
the jack assembly located on the front of the Model
354’s enclosure. For known excellent performance,
it’s recommended that a Studio Technologies’ GME-
3-12 Gooseneck Microphone be utilized. The analog
monitor output, located on the back of the Model
354’s enclosure, is accessible using a 3-pin male XLR
connector. Some applications may take advantage of
this resource, typically for supporting a local monitor
loudspeaker.
Ethernet Connection
A 100BASE-TX Ethernet (100 Mb/s) connection that
also supports Power-over-Ethernet (PoE) is required
for Model 354 operation. This single connection will
provide both the Ethernet data interface and power
for the Model 354’s circuitry. The Ethernet connection
is made by way a Neutrik etherCON protected RJ45
jack that is located on the back of the Model 354’s
enclosure. This ruggedized and locking RJ45 jack al-
lows connection of an Ethernet signal by way of either
a cable-mounted etherCON connector or a standard
RJ45 plug. The Model 354’s Ethernet interface sup-
ports auto MDI/MDI-X so that a crossover cable is
never required. The Model 354’s Ethernet connection
enumerates itself as a class 1 device. As such, a PoE
power-sourcing-equipment (PSE) port is required to
supply a modest 3.84 watts maximum of power.
Gooseneck Microphone
A mechanical assembly that combines a threaded
bushing with a 3-conductor 1/4-inch jack is incorpo-
rated into the front of the Model 354’s enclosure. This
interface is commonly utilized on professional inter-
com equipment, allowing electrical and mechanical
attachment of a compatible gooseneck microphone.
It’s recommended that the excellent-quality Studio
Technologies’ GME-3-12 Gooseneck Microphone be
utilized. Having an overall length of 12 inches, this

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TALK STATION
unidirectional, electret microphone was designed spe-
cifically to maximize voice reproduction in intercom,
voice paging, and related applications. To minimize
the impact of breath noise, a foam windscreen is
included with each GME-3-12.
From the factory a plastic hole plug is pressed into
the Model 354’s gooseneck bushing. This protects the
connector and internal circuitry from having undesir-
able material such as dirt, dust, or foreign objects
enter the unit. The plastic plug should be removed
and stored prior to the gooseneck microphone being
installed. Typically, a tool isn’t required to lift the edge
of the hole plug from the bushing; the hole plug can
be removed using one’s fingers. Once the bushing is
free of the plastic hole plug, a compatible gooseneck
microphone can be inserted and secured using the
threaded interconnect. Tighten the microphone to the
bushing by hand, turning it in the clockwise direction.
Hand-tighten it until a secure connection has been
made. Do not use a tool to tighten the microphone!
It’s possible that a microphone won’t be needed. This
would be in the rare case where the Model 354’s
ability to play audio files is the only function that is
required. In this odd but possible case, a gooseneck
microphone would not be required.
The two main requirements for a compatible goose-
neck microphone are 1) that it contain an electret mi-
crophone capsule and 2) it interconnects by way of a
1/4-inch 3-conductor plug with an integrated threaded
bushing with pitch of 7/16-20 UNF. The RTS®/Telex®/
Bosch® MCP-90-series of gooseneck microphones
should be directly compatible with the Model 354 and
will perform acceptably. Gooseneck microphones
from other sources such as Clear-Com® may also be
utilized. But known-excellent performance would be
obtained using the aforementioned GME-3-12.
The 3-conductor 1/4-inch jack associated with the
Model 354’s gooseneck bushing has a tip connection
that is used for microphone audio as well as to sup-
plying the low-voltage DC needed for powering the
electret microphone. (The power source is 3.3 volts
DC in series with a 2.49 k resistor.) The ring connec-
tion is used for the microphone’s low signal (audio and
DC).The sleeve connection is chassis ground and isn’t
used as a signal conductor. (Although it does play an
important role is shielding the microphone assembly.)
Within the Model 354’s circuitry the ring and sleeve
connections are connected together as well as being
connected (“tied”) to the chassis.
The Model 354’s gooseneck bushing includes a hex-
head socket set screw with a thread pitch of 4-40
UNC. This allows the gooseneck microphone to be
secured into the bushing by simply tightening the set
screw against the microphone using a 5/64-inch hex
driver. In many cases, especially in applications where
the Model 354 will be moved from venue-to-venue, it
may not be optimal for the hex screw to be utilized.
This is because the gooseneck microphone may need
to be removed and stored for transit. In this case, the
set screw should be removed and stored.
Analog Monitor Output
The Model 354’s analog monitor output, accessible
by way of a 3-pin male XLR connector located on the
back panel, is designed to connect to a variety of de-
vices. It’s expected that in many situations the analog
monitor output will be utilized for local audio monitor-
ing. The simplest means to accomplish this is to use
a loudspeaker with an internal amplifier, such as a
model from the popular Fostex® 6301-series. Other
applications may connect the analog monitor output to
the input of an audio power amplifier associated with
a loudspeaker. And, depending on how the Model 354
is configured using the STcontroller application, the
analog monitor output can also be useful in a number
of general-purpose audio monitoring applications.
The Model 354’s analog monitor output is line-level,
electronically balanced, and capacitor coupled. It can
correctly interface with balanced or unbalanced loads
of 2 k (2000) ohms or greater. A configuration setting
in the STcontroller application is used to select how
the analog monitor output will function from among
three operating modes. In the Adjustable (Post-Fader)
mode the level of the analog monitor output will be
dependent upon the setting of the front-panel level
control. (A level control is also be known in the audio
world as a “fader.” “Post” indicates that the monitor
output will obtain its audio source after (“post”) the
level control.)
When selected for the Fixed –10 (Pre-Fader) mode
the analog monitor output will have a fixed nominal
output level of –10 dBu. In this mode, the nominal
output level has been optimized to match the input
sensitivity typically found on amplified loudspeak-
ers. Since most amplified loudspeakers contain an

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TALK STATION
integrated level control, the analog monitor output’s
signal is “pre-fader,” that is with no interaction from the
Model 354’s level control. In the Fixed 0 (Pre-Fader)
mode the monitor output has a fixed nominal output
level of 0 dBu. This can be useful as a “professional”
line-level output for connection with audio routers,
intercom systems, audio transport equipment, or a
local monitoring system. In both of the fixed modes,
the level control on the front of the Model 354 will not
impact the level of the monitor output. (The audio sig-
nal is presented to the analog monitor output circuitry
before (“pre”) the level control.)
The analog monitor output is presented on a 3-pin
male XLR connector which is located on the Model
354’s back panel. An interface cable prepared for
connection to the analog monitor output should use
a 3-pin female XLR connector that is wired such that
pin 2 is connected as signal + (high), pin 3 as signal
– (low), and pin 1 as common/shield. To connect to
an unbalanced input use XLR pin 2 as signal + (high)
and pin 1 as low/shield. Pin 3 should be left uncon-
nected. To clarify, for correct unbalanced operation it
is important not to connect pin 3 to anything; do not
connect pins 1 and 3 together.
Dante Configuration
For audio to pass to and from the Model 354 requires
configuration of several Dante-related parameters.
These configuration settings are stored in non-volatile
memory within the Model 354’s circuitry. Configura-
tion will typically be done with the Dante Controller
software application which is available for download
free of charge at audinate.com. Versions of Dante
Controller are available to support Windows® and
macOS® operating systems.
The Model 354’s Dante interface is compatible with
the Dante Domain Manager (DDM) software applica-
tion. Refer to the DDM documentation, also available
from Audinate, for details on which Model 354 and
related parameters may need to be configured.
Audio Routing
The Model 354 has four transmitter (output) and four
receiver (input) channels that are associated with the
unit’s Dante interface. The transmitter (output) chan-
nels must be assigned to the desired Dante receiver
(input) channels on one or two devices. This achieves
routing of the Model 354’s audio output channels
to the device (or devices) that will be “listening” to
them. In addition, the unit’s four Dante receiver (input)
channels can be subscribed (routed) with one or two
devices that supply the desired Dante transmitter
(output) channels. These four audio input channels
can provide the monitor, talent cue (IFB program or
non-interrupt), or background music signals needed
for a specific application. These receiver (input)
channels can also be used in a confirmation man-
ner, controlling the state of an associated transmitter
(output) channel’s high-frequency tone signal. Note
that within Dante Controller a “subscription” is the term
used for routing a transmitter flow (a group of up to
four output channels) to a receiver flow (a group of
input channels).
The Model 354 uses an UltimoX4 integrated circuit
to implement its Dante functionality. The number of
flows associated with this integrated circuit is four; two
transmitter (output) and two receiver (input). With this
small number of flows it’s possible that a flow limitation
condition could occur. A flow can be unicast, multicast,
or a combination of the two. If the Model 354’s Dante
transmitter (output) channels need to be subscribed
(routed) to more than two flows it’s possible that an
intermediary device, such as the Studio Technologies’
Model 5422A Dante Intercom Audio Engine, can be
used to “repeat” the signals with little chance of reach-
ing a flow limitation.
Note that when the AES67 mode has been enabled
in the Dante Controller application the Model 354’s
Dante transmitter (output) channels will only function
in multicast; unicast is not supported.
Unit and Channel Names
The Model 354 has a default Dante device name of
ST-M354- and a unique suffix. The suffix identifies
the specific Model 354 that is being configured. The
suffix’s actual alpha and/or numeric characters relate
to the MAC address of the unit’s UltimoX4 integrated
circuit. The four Dante transmitter (output) channels
have default names of Ch1, Ch2, Ch3, and Ch4/
Monitor Output. The four Dante receiver (input)
channels have default names of Ch1, Ch2, Ch3, and
Ch4. Using Dante Controller, the default device name
and channel names can be revised as appropriate for
the specific application.

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Device Configuration
The Model 354 supports an audio sample rate of
48 kHz with no pull-up/down options available. The
unit’s 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 within Dante Controller, if required,
but the default values are typically correct.
Network Configuration
Typically, the Model 354’s Dante IP address and
related network parameters will be determined auto-
matically using DHCP or, if that’s not available, the
link-local network protocol. If desired, Dante Controller
allows IP address and related network parameters to
be manually set to a fixed or static configuration. While
this is a more-involved process than simply letting
DHCP or link-local “do their thing,” if fixed addressing
is necessary then this capability is available.
AES67 Configuration – AES67 Mode
Dante Controller allows a Model 354 to be configured
for AES67 operation. This requires the AES67 mode to
be set for Enabled. As previously noted in this guide,
if AES67 mode is Enabled then the Dante transmitter
(output) channels will use multicast.
Model 354 Clocking Source
While technically the Model 354 can serve as a Leader
clock for a Dante network (as can all Dante-enabled
devices), in most cases the unit will be configured
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 354 would typically not be enabled.
Model 354 Configuration
The STcontroller software application is used to con-
figure the way in which the Model 354 functions. No
DIP switch settings or other local actions are used
to configure the unit. This makes it imperative that
STcontroller be available for convenient use on a per-
sonal computer that’s connected to the related LAN.
Installing STcontroller
STcontroller is available free of charge on the Studio
Technologies’ website (studio-tech.com). Versions are
available that are compatible with personal comput-
ers running selected versions of the Windows® and
macOS® operating systems. If required, download
and install STcontroller onto a designated personal
computer. This personal computer must be on the
same local area network (LAN) and subnet as the
Model 354 units that are to be configured. Immediately
after starting STcontroller the application will locate all
the Studio Technologies’ devices that it can control.
The one or more Model 354 units to be configured
will appear in the device list. Use the Identify com-
mand to allow easy recognition of a specific Model
354 unit. Double-clicking on a device name will cause
the associated configuration menu to appear. Review
the current configuration and make any changes that
are desired.
Changes made using STcontroller will be immediately
reflected in the unit’s operation; no Model 354 reboot
is required. Each time a change is made the four
pushbutton switches on the Model 354’s front panel
will flash orange in a distinctive pattern to indicate that
a command from STcontroller has been received.
General Menu Page
The following configuration selections are available
in the General menu selections tab:
Microphone Input – Preamplifier Gain
Choices are: 12 dB, 18 dB, 24 dB, 30 dB, 36 dB
The gain of the microphone preamplifier associated
with the gooseneck microphone will operate from
among five configurable choices. The compressor
active LED, located on the back panel, can act as a
guide when setting the preamp gain. When a voice
signal at a normal level is presented to the gooseneck
microphone the compressor active LED should light
intermittently. If, for example, the LED rarely lights and
the gain is set to 18 dB, it might be a good idea to
change the setting to 24 dB or 30 dB. If the compres-
sor LED is lit fully during normal talking and the gain
is set for 30 or 36 dB, a change to one of the lower
values might be warranted.
System – Button LED Intensity
Choices are: Low, High
Under the top surface of each of the four pushbutton
switches is a red and a green LED indicator. The
LED intensity configuration choice allows the overall

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intensity of these LEDs, as a group, to be selected.
Deciding which choice, low or high, is optimal will
typically depend on the amount of ambient light that is
present in the area where the Model 354 is located.
System – Button LED Action
Choices are:
Red when Off/Green when On
Green when Off/Red when On
Unlit when Off/Green when On
Unlit when Off/Red when On
The action of the red and green LED indicators as-
sociated with the four pushbutton switches can be
configured. (There are two red and two green LEDs
in each pushbutton switch.) The pushbutton switches
are configured as a group, all acting in the same
manner. The third and fourth choices were specifi-
cally provided to support users who have limitations
in their ability to discern between two colors (“color
blindness”).
Red when Off/Green when On: The LEDs in each
pushbutton switch will light red when its associated
function is off (not active). The LEDs in each pushbut-
ton switch will light green when its associated function
is on (active).
Green when Off/Red when On: The LEDs in each
pushbutton switch will light green when its associated
function is off (not active). The LEDs in each pushbut-
ton switch will light red when its associated function
is on (active).
Unlit when Off/Green when On: The LEDs in each
pushbutton switch will not light when its associated
function is off (not active). The LEDs in each pushbut-
ton switch will light green when its associated function
is on (active).
Unlit when Off / Red when On: The LEDs in each
push-button switch will not light when its associated
function is off (not active). The LEDs in each pushbut-
ton switch will light red when its associated function
is on (active).
Monitor Output – Overall Level
Choices are:
Fixed –10 (Pre-Fader)
Fixed 0 (Pre-Fader)
Adjustable (Post-Fader)
The functioning of the analog and Dante monitor out-
puts can be configured from among three choices.
Fixed –10 (Pre-Fader): When selected the analog
monitor output’s nominal level will be –10 dBu and the
Dante monitor output (if enabled) will be –30 dBFS.
The level of both outputs will not be impacted by the
front-panel rotary level control. Technically, when
Fixed –10 (Pre-Fader) is selected, a digital audio
signal that arrives in the selected Model 354 Dante
receiver (input) channel at –20 dBFS will result in an
analog monitor output level of –10 dBu and a digital
monitor output level of –30 dBFS. This setting is ap-
propriate when one of the monitor outputs is being
connected to an amplified speaker which includes
input gain and a level control. This configuration may
be appropriate when the input of a Fostex® 6301-
series amplified loudspeaker is connected to the
Model 354’s analog monitor output or subscribed to
the Dante monitor output. In this way, the user is only
required to adjust the level control on the associated
amplified loudspeaker.
Fixed 0 (Pre-Fader): If selected then the analog
monitor output’s nominal level will be 0 dBu and the
Dante monitor output (if enabled) will be –24 dBFS.
(Again, referenced to a Dante input signal with a level
of –20 dBFS.) Neither output will be impacted by the
Model 354’s front-panel rotary level control. This set-
ting might be appropriate when the analog monitor
or Dante monitor output signals are being used with
other equipment that needs something that approach-
es a more-standard nominal line-level signal.
Adjustable (Post-Fader): When this mode is se-
lected the rotary level control will impact the level of
the analog monitor output and Dante monitor output
(if enabled). The rotary level control, with a push-
in/push-out knob action, is located on the front of the
Model 354’s enclosure. In this mode when the rotary
level control is adjusted to its fully clockwise (CW)
position the analog monitor output level will be +4 dBu
and the Dante monitor output level will be –20 dBFS.
(Referenced to a Dante input signal with a nominal
level of –20 dBFS.) The level control will perform an
attenuation action as the knob is turned in the coun-
terclockwise position. The analog and digital monitor
outputs will be fully muted when the rotary level control
is set to its fully counterclockwise (CCW) position.

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Monitor Output – Program Audio Source
Choices are: None, Ch 1, Ch 2, Ch 3, Ch 4,
Selectable Ch 1 – Ch 3 (Uses Ch 4 Button)
This configuration selection relates to the audio source
that is associated with the analog monitor output and,
in some circumstances, the Dante monitor output.
None: When selected the analog monitor output will
be disabled. The Dante monitor output function will be
disabled and the associated Dante transmitter (output)
channel will be used for the functions associated with
channel 4.
Ch 1, Ch 2, Ch 3, or Ch 4: When selected then the
specified Dante receiver (input) channel will be used
as the source for the analog monitor output. The
Dante monitor function will not be active and the as-
sociated Dante transmitter (output) channel will be
used for the functions associated with channel 4.
Selectable Ch 1 – Ch 3 (Uses Ch 4 Button): When
selected then a somewhat unique Model 354 mode
will be enabled. This will allow Dante receiver (input)
channels Ch 1, Ch 2, or Ch 3 to serve as the signal
source for the analog monitor output and the now-
active Dante monitor output. Using the Model 354’s
four pushbutton switches the monitor source can be
selected from among the three choices as well as
none. Selecting this mode will prevent the fourth but-
ton from being able to be used to control a voice page
or related function. However, it may prove useful for
special circumstances where it’s important for a user
to be able to select the monitor audio source. It’s also
useful when a Dante digital monitor output is needed
for an application.
Monitor Output – Program Audio Dim
when Preamble or Mic Active
Choices are: 0 dB, 5 dB, 10 dB, 15 dB, 20 dB,
Full Mute
This configuration selects the level change that will
be made to the analog monitor output and, if enabled,
Dante monitor output when a preamble message and/
or microphone audio is active. It is provided primarily
to prevent audio crosstalk and acoustical feedback
that could occur from an adjacent monitor loudspeaker
and a connected gooseneck microphone. Selecting
0 dB would effectively serve to disable this dim func-
tion. (Reducing the level of something by 0 dB would
not change a change to occur.) Selecting Full Mute
would effectively make this dim function be a monitor
output mute function.
Monitor Output – Preamble Audio Level
Choices are: Off, Low, Medium Low, Medium,
Medium High, High
To assist a Model 354 user, it’s possible that enabling
this function would be useful, sending preamble audio
to the analog monitor output and, if enabled, Dante
monitor output, whenever a preamble message is
actively being played. This would allow a user to
hear the preamble audio over an associated monitor
loudspeaker and, if applicable, prepare to make a
voice announcement.
Monitor Output – Mic Audio Level
Choices are: Off, Low, Medium Low, Medium,
Medium High, High
In special circumstances, it’s possible that it would
be useful to send microphone audio to the analog
monitor output and, if enabled, Dante monitor output,
whenever the mic function is active. This would allow
a user to hear their own voice as a confirmation of
what action is occurring. If enabled, the microphone
audio signal, when active, would be sent to the
analog monitor output and, if configured, the Dante
Ch 4/Monitor output transmitter (output) channel.
When configured for Off no microphone audio will be
sent to either monitor output. The five other choices
allow the microphone audio to be sent to the moni-
tor outputs at various levels. Note that selecting a
level that’s too high can result in acoustic feedback
between an associated monitor loudspeaker and a
connected gooseneck microphone.
Preamble Audio – File 1 Level Trim
Choices are: –12 dB, –9 dB, –6 dB, –3 dB, 0 dB,
3 dB, 6 dB, 9 dB, 12 dB
The preamble function allows a stored audio source
(in the form of a WAV file) to be sent out the des-
ignated Dante transmitter (output) channels. This
configuration setting allows the playback level of File
1 to be adjusted (“trimmed”) from among nine avail-
able choices. A negative value would indicate that
the level of the file would be reduced. Selecting 0 dB
would cause no level change to be made to File 1.
And a positive selection would allow gain to be added

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to the level of the information stored in File 1. This
configuration choice allows the level of the preamble
audio provided in File 1 to be adjusted relative to the
microphone audio level.
Preamble Audio – File 2 Level Trim
Choices are: –12 dB, –9 dB, –6 dB, –3 dB, 0 dB,
3 dB, 6 dB, 9 dB, 12 dB
This configuration choice functions the same as the
previous configuration but applies to File 2.
Preamble Audio – Allow Update of Files
Choices are: No, Yes
A USB flash drive can be used to load preamble files
into the Model 354’s non-volatile storage. This is a fast
and simple means of revising the two audio (WAV)
files as desired. A USB Type A receptacle is located
on the unit’s back panel and is compatible with most
commonly available flash drives. This configuration
setting determines whether or not the Model 354 will
load WAV files that are stored on a USB flash drive.
When configured for No the unit will ignore preamble
files that are present on a connected USB flash drive.
New audio files can be loaded when Yes has been
selected.
Channel Specific Menu Page
The following configuration selections apply indi-
vidually to Channels 1-4. They are available in each
Channel Specific column:
Button Action
Choices are: Momentary, Tap to Latch,
Momentary/Tap to Latch, Disabled
The manner in which a button functions can be con-
figured from among four choices.
Momentary: If this mode is selected a button’s func-
tion will normally be inactive. Whenever the button is
pressed the associated function will become active.
Tap to Latch: If this mode is selected the button’s
function will alternate between its active and inactive
states whenever the button is pressed. Upon Model
354 power up the button will be in its inactive state.
Momentary/Tap to Latch: This mode is a combina-
tion of the Momentary and Tap to Latch modes. It’s
similar to the way in which pushbutton switches often
function on user stations associated with broadcast or
production intercom systems. If the button is pressed
and held the associated function will become active.
It will stay active until the button is released. If the
button is “tapped” the status of the function will
change, either from inactive-to-active or from active-
to-inactive. Upon Model 354 power up the button will
be in its inactive state.
Disabled: In this mode the button will not perform a
function. Pressing it will cause the button’s red LED
to flash, indicating that it has been disabled.
Button Function
Choices are:
Mic Audio Only
Preamble Audio (Play Once), then Mic Audio
Preamble Audio (Play Once), Mix with Mic Audio
Preamble Audio Only (Play Once, Interruptible)
Preamble Audio Only (Play Once, Complete)
Preamble Audio Only (Play Continuous, Interruptible)
Preamble Audio Only (Play Continuous, Complete)
The action that happens when a channel’s pushbutton
switch becomes active will follow this configuration.
The seven available modes are unique and warrant
a careful review before a selection is made.
Mic Audio Only: In this mode whenever the channel’s
pushbutton switch is active microphone audio will be
sent out the associated Dante transmitter (output)
channel.
Preamble Audio (Play Once), then Mic Audio: In
this mode whenever the channel’s pushbutton switch
becomes active the selected preamble audio file will
be sent to the Dante transmitter (output) channel.
After the preamble audio file has played once the
microphone audio will become active. Just to clarify,
during the time that the preamble file is playing, audio
from the microphone will not be sent to the Dante
transmitter (output) channel. Only after the preamble
file has been played once will the microphone become
active.
Preamble Audio (Play Once), Mix with Mic Audio:
In this mode whenever the channel’s pushbutton
switch becomes active the selected preamble audio
file will be sent to the Dante transmitter (output) chan-
nel. At the same time microphone audio will become
active and mixed (combined) with the preamble
audio.

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Preamble Audio Only (Play Once, Interruptible):
In this mode when the channel’s pushbutton switch
becomes active the selected preamble audio file will
play once and then stop. Changing the pushbutton
switch to its inactive state when the preamble audio
file is actively playing will cause it to immediately stop.
Microphone audio will never become active.
Preamble Audio Only (Play Once, Complete): In
this mode when the channel’s pushbutton switch
becomes active the selected preamble audio file will
play once and then stop. Changing the pushbutton
switch to its inactive state when the preamble audio
file is actively playing will not cause it to stop. The
preamble audio file will always completely play once.
Microphone audio will never become active.
Preamble Audio Only (Play Continuous, Interrupt-
ible): In this mode when the channel’s pushbutton
switch becomes active the selected preamble audio
file will play continuously. Changing the pushbutton
switch to its inactive state when the preamble audio
file is actively playing will cause it to immediately
stop.
Preamble Audio Only (Play Continuous,
Complete): In this mode when the channel’s push-
button switch becomes active the selected preamble
audio file will play continuously. Changing the push-
button switch to its inactive state when the preamble
audio file is actively playing will not cause it to imme-
diately stop. The preamble audio file will play until it
ends and then stop.
Preamble Audio Source
Choices are: File 1, File 2
The Model 354 can store and play two independent
audio (WAV) files. These are called preamble audio
files and are loaded using a USB flash drive. This con-
figuration selection determines which of the two files is
assigned to a specific pushbutton switch function.
Program Audio Source
Choices are: None, Ch 1, Ch 2, Ch 3, Ch 4
This selection determines which of the Dante receiver
(input) channels is used as the program audio source
for its associated Dante transmitter (output) channel.
For a typical voice paging system application this
configuration determines which audio signal would
be sent to a paging zone as the background music
source. For broadcast applications where talent cue
(interrupted foldback or IFB) signals need to be cre-
ated this setting would determine the IFB program
audio source.
A separate configuration setting determines the
amount of attenuation that will be applied to the pro-
gram audio source when the preamble or microphone
audio is active. For some applications it’s possible
that a program audio source will not be assigned to
a Dante transmitter (output) channel. In this situation,
the selection of None would be correct.
Program Audio Dim
Choices are: 0 dB, 5 dB, 10 dB, 15 dB, 20 dB,
Full Mute
This value determines the amount of attenuation that
will be applied to the selected program audio source
when the preamble audio or microphone audio is
active on the Dante transmitter (output) channel.
Selecting 0 dB will configure the channel to have no
change in program audio level when the preamble or
microphone function is active. The preamble and/or
microphone audio will simply be combined (added or
summed) with the program audio. When Full Mute is
selected the program audio source will fully attenu-
ate (completely mute) whenever the preamble and/or
microphone audio is active. In voice paging applica-
tions it would be typical to select 5 dB or 10 dB for
the program audio dim, reducing but not muting a
background music source. In most broadcast appli-
cations where a talent cue (interrupt or IFB function)
signal is going to be created a value of 15 dB would
be appropriate.
Channel Status Signal
Choices are:
None
18 kHz Tone when Preamble or Mic Active
20 kHz Tone when Preamble or Mic Active
20 kHz when Inactive, 18 kHz when Preamble
or Mic Active
20 kHz when Receiver Channel Active, None when
Preamble or Mic Active
16 kHz when Receiver Channel Inactive, 20 kHz
when Receiver Channel Active, 18 kHz when
Preamble or Mic Active
The Model 354 can be configured to support a number
of interesting applications through the generation of

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Model 354
TALK STATION
high-frequency sine-wave audio tones that are added
to the Dante transmitter (output) channels. The pres-
ence of these tones can be selected such that the
status of a Model 354 channel can be communicated
to a connected device. These status signals allow the
unit to be integrated into a range of local and remote
applications. Used in conjunction with the Studio
Technologies’ Model 5422A Dante Intercom Audio
Engine, it would be simple to create REMI or At-Home
functions. Most digital audio processor units can be
programmed to respond to the audio tones.
None: In this mode no tones will be added to the
associated Dante transmitter (output) channel.
18 kHz Tone when Preamble or Mic Active: In this
mode an 18 kHz sine wave tone will be sent out the
associated Dante transmitter (output) channel when-
ever preamble or microphone audio is active. The
sine-wave tone will be mixed (combined or summed)
with the preamble and/or microphone audio. This
function can be useful by providing an “on-air” trig-
ger for functions associated with devices such as the
Model 5422A Dante Intercom Audio Engine.
20 kHz Tone when Preamble or Mic Active: Similar
to the previous mode, this mode provides a 20 kHz
sine wave tone, combined with the preamble or mi-
crophone audio, on the associated Dante transmitter
(output) channel.
20 kHz when Inactive, 18 kHz when Preamble or
Mic Active: In this mode whenever the associated
preamble or microphone audio is inactive then a 20
kHz tone will be sent out the associated Dante trans-
mitter (output) channel. No tone will be sent when
the preamble and/or microphone audio is active. This
serves as a channel “keep alive” signal, indicating
that the audio path is actively functioning but that no
user audio is present. The way in which this oper-
ates harks back to the days of 4-wire telephone truck
circuits. An “idle” trunk would have a continuous tone
present to alert personnel that a circuit was “live” and
ready to function. When the trunk became active the
tone would be removed and voice audio would be
connected.
20 kHz when Receiver Channel Active, None when
Preamble or Mic Active: If a high-frequency tone
is present on the Dante receiver (input) channel
then the Model 354 considers this to be a receiver
channel active condition. If the receiver channel is
active and preamble or microphone audio is not active
then a 20 kHz tone is sent out the Dante transmitter
(output) channel. If, whether or not a tone is present
on the Dante receiver (input) channel, preamble or
microphone audio is active then no tone will be sent
out the Dante transmitter (output) channel. This choice
will allow a more sophisticated “keep alive” signal to
be generated, one that indicates when an associated
receiver channel is active.
16 kHz when Receiver Channel Inactive, 20 kHz
when Receiver Channel Active, 18 kHz when
Preamble or Mic Active: This mode provides three
different tones that represent the status of both the
associated Dante transmitter (output) channel and
the Dante receiver (input) channel. When the Dante
receiver (input) channel associated with the unit’s
specific channel doesn’t have a high-frequency
tone present the Model 354 considers this to be a
receiver channel inactive condition. In this case, a
16 kHz wave tone is sent out the associated Dante
transmitter (output) channel. If a high-frequency tone
is present on the Dante receiver (input) channel then
the Model 354 considers this to be a receiver channel
active condition. If the receiver channel is active and
preamble or microphone audio is not active then a
20 kHz tone is sent out the Dante transmitter (output)
channel. If the receiver channel is active and preamble
or microphone audio is active then an 18 kHz tone is
sent out the Dante transmitter (output) channel. The
tones always combine (mix or sum) with any other
audio signal that’s present on the Dante transmitter
(output) channel. After some study it’s hoped that it
will become clear as to why this set of tone signals
would allow an audio process device to recognize
the operating status of a Model 354’s receiver and
transmitter channel.
Operation
Pending.
Technical Notes
IP Address Assignment
By default, the Model 354’s Dante-associated Eth-
ernet interface will attempt to automatically obtain
an IP address and associated settings using DHCP
(Dynamic Host Configuration Protocol). If a DHCP
server is not detected an IP address will automatically

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Model 354
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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 randomly assign a
unique 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,
in most cases, correctly acquire IP addresses and be
able to communicate with each other.
An exception does arise when trying to directly inter-
connect two Dante-enabled devices that use Ultimo
integrated circuits to implement Dante. The Model 354
uses an UltimoX4 “chip” and, as such, a direct one-to-
one interconnection between it and another Ultimo-
based product would typically not be supported. An
Ethernet switch linking these units would be required
to successfully interconnect the two Ultimo-based
devices. The technical reason that a switch is required
relates to the need for a slight latency (delay) in the
data flow; an Ethernet switch will provide this. This
wouldn’t typically prove to be an issue as the Model
354 uses Power-over-Ethernet (PoE) to provide
its operating power. As such, in most cases a PoE-
enabled Ethernet switch would be utilized to support
Model 354 units.
Using the Dante Controller software application,
the Model 354’s IP address and related network
parameters can be set for a manual (fixed or static)
configuration. While this is a more-involved process
than simply letting DHCP or link-local “do their thing,”
if fixed addressing is necessary then this capability is
available. But in this case, it’s highly recommended
that every unit be physically marked, e.g., directly
using a permanent marker or “console tape,” with its
specific static IP address. If knowledge of a Model
354’s IP address has been misplaced there is no reset
button or other method to easily 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) net-
working command can be used to “probe” devices on
a network for this information. For example, in Win-
dows 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 small PoE-enabled Ethernet switch
connecting a personal computer to the Model 354.
Then by using the appropriate ARP command the
required “clues” can be obtained.
Optimizing Network Performance
For best Dante audio-over-Ethernet performance a
network that supports VoIP QoS capability is recom-
mended. In applications that utilize multicast Ethernet
traffic enabling IGMP snooping can be valuable.
(Ensure that support for PTP timing messages is
maintained.) These protocols can be implemented on
virtually all contemporary managed Ethernet switches.
There are even specialized switches that are opti-
mized for entertainment-associated applications. Re-
fer to the Audinate website (audinate.com) for details
on optimizing networks for Dante applications.
Application Firmware Version
Display
A selection in the STcontroller software application
allows the Model 354’s application firmware version
to be identified. This can be useful when working with
factory personnel on application support and trouble-
shooting. To identify the firmware version, begin by
connecting the Model 354 unit to the network (via
Ethernet with PoE) and wait until the unit starts to
function. Then, after starting STcontroller, review the
list of identified devices and select the specific Model
354 for which you want to determine its application
firmware version. Then select Version and Informa-
tion under the Device tab. A page will then display
that will provide lots of useful information, including
the application firmware version and well as details
on the Dante interface firmware.
Application Firmware Update
Procedure
It’s possible that updated versions of the application
firmware (embedded software) that is utilized by the
Model 354’s microcontroller (MCU) integrated circuit
will be released to add features or correct issues.
Refer to the Studio Technologies’ website for the
latest application firmware file. The unit has the abil-
ity to load a revised file into its MCU’s non-volatile
memory by way of a USB interface. The Model 354
implements a USB host function that directly supports
connection of a USB flash drive. The Model 354’s

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MCU updates its application firmware using a file
named M354XvXX.stm where Xs are decimal digits
that represent the version number.
The update process begins by preparing a USB flash
drive. The flash drive doesn’t have to be empty (blank)
but must be in the personal-computer-standard FAT32
format. The processor in the Model 354 is compat-
ible with USB 2.0, USB 3.0, and USB 3.1-compliant
Flash drives. Save the new firmware file in the root
folder with a name of M354vXrXX.stm where XrXX
is the actual version number. Studio Technologies
will supply the application firmware file inside a .zip
archive file. While the firmware file inside of the zip file
will adhere to the naming convention required by the
Model 354, the name of the zip file itself will include
the file’s version number. For example, a file named
M354v1r01MCU.zip would indicate that version
1.01 of the application firmware (M354v1r01.stm)
is contained within this zip file along with a readme
(.txt) text file.
Once the USB flash drive is inserted into the USB
host interface, located on the back panel of the Model
354, the unit must be powered off and again powered
on. At this point, the file from the USB flash drive will
automatically load. The precise steps required will be
highlighted in the next paragraphs of this guide.
To install the application firmware file, follow these
steps:
1. Disconnect power from the Model 354. This will
entail removing the Ethernet connection that is
made to the RJ45 jack.
2. Locate the USB receptacle on the back of the unit.
Insert the prepared USB flash drive into it.
3. Apply power to the Model 354 by connecting an
Ethernet signal that has Power-over-Ethernet
(PoE) present to the RJ45 jack.
4. After a few seconds the Model 354 will run a “boot
loader” program that will automatically load the
new application firmware file (M354vXrXX.stm).
This loading process will take only a few seconds.
During this time period the green LED that’s located
adjacent to the USB receptacle will flash slowly.
Once the entire loading process is over, taking ap-
proximately 10 seconds, the Model 354 will restart
using the newly loaded application firmware.
5. At this time the Model 354 is functioning with the
newly loaded application firmware and the USB
flash drive can be removed. But to be conservative,
remove the PoE Ethernet connection first and then
remove the USB flash drive. Then re-connect the
Ethernet signal to restart the unit.
6. Using STcontroller, confirm that the desired applica-
tion firmware version has been correctly loaded.
Note that upon power being applied to the Model 354
if a connected USB flash drive doesn’t have the cor-
rect file (M354vXrXX.stm) in its root folder no harm
will occur. Upon power up the adjacent green LED will
flash on and off rapidly for a few seconds to indicate
this condition and then normal operation using the
unit’s existing application firmware will begin.
Ultimo Firmware Update
As previously discussed in this guide, the Model 354
implements its Dante connectivity using the UltimoX4
integrated circuit from Audinate. The Dante Controller
software application can be used to determine the ver-
sion of the firmware (embedded software) that resides
in this integrated circuit. The firmware (embedded
software) residing in the UltimoX4 can be updated
using the Model 354’s Ethernet port. Performing
the update process is easily accomplished using an
automated method called Dante Updater that’s
included as part of the Dante Controller application.
This application is available, free of charge, from
the Audinate website (audinate.com) The latest
Model 354 firmware file, with a name in the form of
M354vXrX.dnt, is always available on the Studio
Technologies’ website as well as being part of Audi-
nate’s product library database. The latter allows the
Dante Updater software application that is included
with Dante Controller to automatically query and, if
required, update the Model 354’s Dante interface.
Restoring Factory Defaults
A command in the STcontroller software application
allows the Model 354’s defaults to be reset to the fac-
tory values. From STcontroller select the Model 354
for which you want to restore its defaults. Select the
Device tab and then the Factory Defaults selection.
Then click on the OK box. Refer to Appendix A for a
list of the Model 354’s factory defaults.

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Specifications
Applications: Dante-based voice paging, intercom,
talent cue (broadcast IFB), and general audio
installations
Power Source: Power-over-Ethernet (PoE), class 1
(very low power, ≤3.84 watts), per IEEE 802.3af
General Audio:
Internal Digital Audio Processing: 32-bit, fixed
Nominal Digital Input and Output Level: –20 dBFS
Network Audio Technology:
Type: Dante® audio-over-Ethernet
AES67-2018 Support: yes
Dante Domain Manager™ (DDM) Support: yes
Bit Depth: 16, 24, or 32
Sample Rate: 48 kHz
Number of Transmitter (Output) Channels: 4
Number of Receiver (Input) Channels: 4
Dante Audio Flows: 4; 2 transmitter, 2 receiver
Network Interface:
Type: 100BASE-TX, twisted-pair Ethernet with
Power-over-Ethernet (PoE) supported
Data Rate: 100 Mb/s (10 Mb/s and 1000 Mb/s GigE
Ethernet not supported)
Microphone Input:
Compatibility: Studio Technologies’ GME-3-12
gooseneck microphone or equivalent
Microphone Power: 3.3 volts DC via 2.49 k resistor
Impedance: 2.0 k ohms, nominal
Gain: 12, 18, 24, 30, 36 dB, selectable
Frequency Response: –3 dB at 40 Hz, –1 dB at
16 kHz
Distortion (THD+N): 0.022%, measured at
–20 dBFS, 22 Hz to 22 kHz bandwidth, 12 dB of gain
Noise Floor: –95 dBFS, A-weighted, 12 dB of gain
Dynamic Range: >76 dB, A-weighted, measured at
36 dB of gain
Compressor:
Application: applies only to gooseneck microphone
audio
Threshold: 2.7 dB above nominal Dante output level
(–17.3 dBFS), ±0.3 dB
Slope: 2:1
Status LED: compressor active
Preamble Audio:
Number of Channels: 2, field updatable using USB
flash drive
Source Type: 16-bit monophonic, 48 kHz sample
rate, WAV (.wav) files, stored in non-volatile memory
Level: –20 dBFS nominal, adjustable ±12 dB in 3-dB
steps
Duration: up to 40 seconds per WAV file
preliminary calculation)
Distortion: <0.0001%
Frequency Response: 20 Hz to 20 kHz, +0/–0.7 dB
Talent Cue (Broadcast IFB) Capability:
Number of Channels: up to 4, configurable
Audio Sources: Dante receiver (input) channels 1-4
Frequency Response: 20 Hz to 20 kHz, +0/–0.7 dB
Program Audio Attenuation (Dim): 0, 5, 10, 15,
20 dB, Full Mute, configurable
Analog Monitor Output:
Type: electronically balanced, capacitor coupled,
intended to drive balanced or unbalanced loads of
2 k ohms or greater
Audio Source: Dante receiver (input) channels 1-4,
preamble audio, and microphone audio, configurable
Source Impedance: 200 ohms
Nominal Level: 0 dBu, reference –20 dBFS
Maximum Level: +20 dBu, with 0 dBFS input,
measured at 1 kHz
Dynamic Range: >106 dB, A-weighted
Distortion (THD+N): 0.0011% (–99 dB), measured
at –1 dBFS input, 22 kHz bandwidth
Frequency Response: +0/–1.5 dB, 20 Hz to 20 kHz
Level Reduction (Dim) Capability: 0, 5, 10, 15,
20 dB, or full mute, configurable

Issue Preliminary 1, August 2021 Model 354 User Guide
Page 20 Studio Technologies, Inc.
Model 354
TALK STATION
Channel Status Signals:
Action: independently configurable per channel
Send Tone Frequencies: 16, 18, and 20 kHz,
sine-wave
Send Tone Frequency Accuracy: <10 ppm
Send Tone Level: –20 dBFS, nominal
Send Tone Distortion: <0.0001%
Receiver Tone Detect Level Threshold: –23 dBFS
at 16 kHz; –28 dBFS at 18 kHz; –30 dBFS at 20 kHz
Receiver Tone Minimum On Time: 80 milliseconds
Program Input-to-Monitor Output Low-Pass
Filter: –6 dB at 10 kHz; –28 dB at 16 kHz; –55 dB
at 20 kHz
Tone Detect Tone-to-Monitor Output Rejection
Filter: –31 dB at 18 kHz; –46 dB at 20 kHz; –70 dB
at 22 kHz
Connectors:
Gooseneck Microphone: ¼-inch 3-conductor with
7/16-20 UNF threaded bushing; 4-40 hex head
socket set screw allows microphone to be secured
into bushing
Analog Monitor Output: 3-pin male XLR
Ethernet: Neutrik NE8FBH etherCON RJ45 jack
USB: type A receptacle (used only for updating main
firmware and WAV audio files)
Configuration: Studio Technologies’ STcontroller
personal computer application
Software Updating: USB flash drive used for
updating main firmware and WAV audio files; Dante
Controller’s Dante Updater application used for
updating Dante interface firmware
Environmental:
Operating Temperature: 0 to 50 degrees C (32 to
122 degrees F)
Storage Temperature: –40 to 70 degrees C (–40 to
158 degrees F)
Humidity: 0 to 95%, non-condensing
Altitude: not characterized
Dimensions:
3.6 inches wide (9.1 cm)
2.7 inches high (6.9 cm)
4.7 inches deep (11.9 cm)
Deployment: intended for tabletop applications
Weight: 1.1 pounds (0.50 kg) without gooseneck
microphone; 1.4 pounds (0.64 kg) with GME-3-12
gooseneck microphone
Specifications and information contained in this
User Guide subject to change without notice.