Studio Technologies 354A User manual

50297-0423, Issue Preliminary 1
Copyright © 2023 by Studio Technologies, Inc., all rights reserved
studio-tech.com
User Guide
Issue Preliminary 1, April 2023
This User Guide is applicable for serial numbers
M354A-00151 and later with Application Firmware version 1.00 and later
and STcontroller software application version 3.10.18 and later
Model 354A
Talk Station

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Model 354A User Guide Issue Preliminary 1. April 2023
Studio Technologies, Inc. Page 3
Model 354A
TALK STATION
Table of Contents
Revision History ...................................................................................................................... 4
Introduction ............................................................................................................................. 5
Getting Started........................................................................................................................ 8
Dante Conguration ............................................................................................................... 10
Model 354A Conguration...................................................................................................... 11
Preamble Audio Files ............................................................................................................. 19
Operation ............................................................................................................................... 21
Technical Notes...................................................................................................................... 24
Specications......................................................................................................................... 27
Appendix A–STcontroller Default Conguration Values ......................................................... 29

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Model 354A
TALK STATION
Revision History
Issue Preliminary 1, April 2023:
•Initial preliminary release.

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Model 354A
TALK STATION
Introduction
The Model 354A Talk Station is a unique product
intended to support a variety of voice paging, back-
ground music, audio-le playback, broadcast talent
cueing (IFB), and general-audio applications. The
unit supplies four independent “talk” channels that
can be individually congured to match the needs of
an application. A monitor section allows one of the
four Dante
®
receiver (input) channels to be routed as
desired to a connected amplier or amplied speaker.
The Model 354A 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 354A. (Using the
Studio Technologies’ GME-3-12 Gooseneck Micro-
phone is highly recommended.) Two audio sources
or “messages,” up to 40 seconds each in length, are
stored in non-volatile memory within the Model 354A.
These two audio sources, saved in the common 16-
bit monoaural WAV format, can be easily updated by
way of a standard USB ash drive. The audio les
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 les, the desired sources can
be created outside of the Model 354A and then easily
loaded for use. Conguration choices determine how
and when the preamble audio les will be played.
The Model 354A is extremely simple to deploy, is “pro”
quality throughout, and provides an intuitive user ex-
perience. The Model 354A’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 les
can be loaded by way of a USB ash drive.
Model 354A operating features are congured using
the STcontroller software application. An extensive set
Figure 1. Model 354A Talk Station front
and back views
of parameters allows the unit’s functions to be tailor-
ed to meet the needs of a myriad of applications.
STcontroller is a fast and simple means of conrming
and revising the unit’s operating parameters. The
Model 354A is housed in a compact, rugged steel
enclosure 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 354A can
be a complete solution for routing up to four channels
of background audio with voice paging and preamble
audio capability. Pre-recorded “tones” or “chimes” can
be congured to play prior to voice audio be present-
ed to one or more of the outputs. The unit could be
located in a box o󰀩ce or manager’s o󰀩ce location.
A Model 354A function allows high-frequency “call”
audio signals present in a Dante receiver (input) chan-
nel to be detected and displayed in the LED indicators
UPDATE

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Page 6 Studio Technologies, Inc.
Model 354A
TALK STATION
associated with a pushbutton switch. This allows us-
ers to observe the on or o󰀨 status of call signals that
may be associated with intercom audio channels. In
addition, this function can be used to display when
a channel is active. This allows multiple Model 354A
units to be deployed in a single application, with each
unit displaying the talk status of all the others. A cong-
uration option allows an associated pushbutton switch
to be disabled whenever talk activity is taking place
in other units. This feature will help prevent multiple
users from simultaneously activating a talk function.
Broadcast applications can utilize the Model 354A
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 inter-
rupted with gooseneck microphone audio as desired.
Deployment of Dante applications could benet from
the unit’s ability to store and playback WAV audio
les. Test messages could be created in WAV format
and then loaded into the Model 354A for continuous
playback during system commissioning.
Security or management personnel could use the
Model 354A as a combination voice paging console
and monitor resource. Audio from the gooseneck
microphone can be routed to up to four Dante trans-
mitter (output) channels. The monitor section allows
one of the four Dante receiver (input) sources to be
monitored using a connected amplier or amplied
speaker.
The range of resources provided by the Model 354A
also makes it suitable for use in many other appli-
cations. 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
354A 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 3-
conductor ¼-inch plug with integrated threaded bush-
ing. The Studio Technologies’ GME-3-12 Gooseneck
Microphone is available as an option and will perform
very well with the Model 354A.
The monitor output (available in both analog and
Dante digital formats) can assist the user in conrm-
ing system operation. 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. One or two new preamble
audio les can be created and loaded into the Model
354A. They utilize the common WAV le format sup-
ported by many personal computer applications. The
STcontroller software application is used to congure
the wide range of Model 354A operating parameters.
This allows the unit’s performance to be optimized to
meet the needs of specic applications.
The user is presented with ve pushbutton switches
and a push-in/push-out rotary level potentiometer.
Four of the pushbutton switches are lighted with
dual-color LEDs to present the unit’s operating status.
Ethernet Data and PoE
The Model 354A 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, an
etherCON CAT5-compatible plug allows a ruggedized
and locking interconnection for harsh or high-reliability
environments. The Model 354A’s operating power
is provided by way of the Ethernet interface using
the 802.3af Power-over-Ethernet (PoE) standard.
Figure 2. Model 354A Talk Station shown with
optional GME-3-12 Gooseneck Microphone

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Model 354A
TALK STATION
This allows fast and e󰀩cient interconnection with the
associated data network. To support PoE power man-
agement, the Model 354A’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
354A using the Dante audio-over-Ethernet media
networking technology. As a Dante-compliant device,
the Model 354A’s four Dante transmitter (output)
channels and four Dante receiver (input) channels
can be assigned (routed or “subscribed”) to other de-
vices using the Dante Controller software application.
The Dante transmitter (output) and receiver (input)
channels are limited to supporting four Dante ows,
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 additional LED displays the status of the
associated Ethernet connection.
The Model 354A is compatible with the AES67
interoperability standard. When congured in Dante
Controller to support AES67, the unit’s two transmitter
(output) channels will function in multicast; unicast is
not supported. In addition, the Model 354A is compat-
ible with the Dante Domain Manager (DDM) software
application.
Audio Quality
The Model 354A provides excellent audio perfor-
mance. A low-noise, wide dynamic-range microphone
preamplifier 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 conver-
sion (ADC) section that supports a sampling rate of
48 kHz with a bit depth of up to 32.
As previously discussed, the Model 354A can store
and replay two audio les. These uncompressed PCM
audio signals utilize the high-quality 16-bit, monaural,
WAV format.
Audio sources can arrive in the Model 354A by way
of four Dante receiver (input) channels. The support-
ed sampling rate is 48 kHz with a bit depth of up to
32. These signals pass into the Model 354A’s 32-bit
microcontroller 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-per-
formance digital-to-analog (DAC) integrated-circuit
converter and then on to robust balanced (di󰀨erential)
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
conguration and operating state, a combination of
gooseneck microphone, WAV audio le, and Dante
receiver (input) sources. The signals remain in the
digital domain and are routed through the 32-bit
logic circuitry and on to the Dante interface section
where it is packetized and prepared for transport over
Ethernet.
Conguration Flexibility
The Model 354A can easily be congured to meet the
needs of many specic applications and user prefer-
ences. All conguration choices are performed using
the STcontroller software application. Versions of
STcontroller are available to support the WinOS
®
and
macOS
®
operating systems. Selectable congurable
parameters include microphone preamplier gain,
WAV le level trim, LED indicator intensity and actions,
and monitor output source selection and operation. In
addition, each of the four Dante transmitter (output)
functions can be optimized from the six available
conguration choices. These choices allow the unit
to be congured to support voice page, talent cueing
(IFB), and other specialized applications.
As previously described, the functions associated with
the four talk pushbutton switches and Dante transmit-
ter (output) channels can be individually congured.
As an example, for a voice page application three
of the output channels might be congured 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
talk pushbutton switches would typically be congured
to provide a momentary (push to activate) function.

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Page 8 Studio Technologies, Inc.
Model 354A
TALK STATION
Red and green LEDs are associated with the unit’s
four talk 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 conguration 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 di󰀨erentiating between red and green.
The “color blindness” condition is not uncommon in
men and can make e󰀨ective use of some electronic
equipment di󰀩cult. The Model 354A’s ability to control
the talk pushbutton switches’ colors can also be useful
for supporting international applications where compli-
ance to specic regulatory requirements is required.
This may dictate which LED color is associated with
a function being “on” and which color is associated
with a function being “o󰀨.”
The four Dante receiver (input) audio sources and
the way in which they are assigned to the monitor
output functions can be configured from among
six 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 applications, the Model 354A should
be able to achieve the desired conguration. Several
special functions allow the WAV les and gooseneck
microphone audio to be routed to the analog, and, if
enabled, Dante digital monitor outputs. Congurable
using STcontroller, these functions can allow a user to
hear conrmation audio related to the unit’s real-time
operation.
Future Capabilities and Firmware
Updating
The Model 354A 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 rmware (embedded software) to be
updated using a standard USB ash drive. And, as
previously discussed, the USB receptacle is also used
to load WAV audio les that can be stored on the same
USB ash drive. The Model 354A uses the Audinate
UltimoX4™ integrated circuit to implement its Dante
interface. The rmware 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 354A Talk
Station unit along with instructions on how to obtain
an electronic copy of this guide. As the Model 354A
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 354A. 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 to
the connectors located on the back panel of the Model
354A. A gooseneck microphone will, in most cases,
be connected to the 1/4-inch jack assembly located
on the front panel. One Ethernet connection will be
made using either a standard RJ45 patch cable or an
etherCON CAT5-compatible protected RJ45 plug. The
unit’s Ethernet interface requires connection of a sig-
nal that supports Power-over-Ethernet (PoE). In most
cases, an electret-powered gooseneck microphone
that has an integrated 3-conductor 1/4-inch plug will
be connected to the jack assembly located on the front
of the Model 354A’s enclosure. For known excellent
performance, it’s recommended that a Studio Technol-
ogies’ GME-3-12 Gooseneck Microphone be utilized.
The analog monitor output, located on the back of
the Model 354A’s enclosure, is accessible by way of
a 3-pin male XLR connector. Some applications may
take advantage of this resource, typically used 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 354A operation. This single connection will
provide both the Ethernet data interface and power
for the Model 354A’s circuitry. The Ethernet
connection is made by way a Neutrik etherCON
CAT5-compatible protected RJ45 jack that is located
on the back of the Model 354A’s enclosure. This rug-
gedized and locking RJ45 jack allows connection of
an Ethernet signal by way of either a cable-mounted
etherCON CAT5-compatible plug or a standard RJ45
plug. The Model 354A’s Ethernet interface supports

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Studio Technologies, Inc. Page 9
Model 354A
TALK STATION
auto MDI/MDI-X such that a crossover cable is
never required. The Model 354A’s Ethernet connec-
tion 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 incorporat-
ed into the front of the Model 354A’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
unidirectional, electret microphone was designed spe-
cically 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 354A’s gooseneck bushing. This protects
the connector and internal circuitry from having unde-
sirable 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 ngernail. Once the plastic hole
plug is free of the bushing, 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!
The two main requirements for a compatible goose-
neck microphone are 1) that it contain an electret
microphone capsule and 2) it interconnects by way
of a 3-conductor 1/4-inch 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 354A and will perform acceptably. Gooseneck
microphones from other sources such as Clear-Com
®
may also be utilized. But known-excellent perfor-
mance would be obtained using the aforementioned
GME-3-12.
The 3-conductor 1/4-inch jack associated with the
Model 354A’s gooseneck bushing has a tip connec-
tion that is used for microphone audio as well as to
supplying 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 (2490) ohm resistor.)
The ring connection 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 in shielding
the microphone assembly.) Within the Model 354A’s
circuitry the ring and sleeve connections are con-
nected together as well as being connected (“tied”)
to the chassis.
The Model 354A’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 354A will be moved from venue-to-venue,
it may not be optimal for a 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.
It’s possible that a microphone won’t be needed. This
would be in the rare case where the Model 354A’s
ability to play audio les is the only function that is
required. In this odd but possible case, a gooseneck
microphone would not be required.
Analog Monitor Output
The Model 354A’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 amplier, 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 amplier associated with a
loudspeaker. And, depending on how the Model 354A
is congured using the STcontroller application, the
analog monitor output can also be useful in a number
of general-purpose audio monitoring applications.

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Page 10 Studio Technologies, Inc.
Model 354A
TALK STATION
The Model 354A’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 conguration 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
depend on the setting of the front-panel level control.
(“Post” indicates that the monitor output will obtain its
audio source after (“post”) the level control; a level
control is also known in the audio world as a “fader.”)
When selected for the Fixed –10 (Pre-Fader) mode,
the analog monitor output will have a xed 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 amplied loudspeakers contain an
integrated level control, the analog monitor output’s
signal is “pre-fader,” that is with no interaction from the
Model 354A’s level control. In the Fixed 0 (Pre-Fader)
mode the monitor output has a xed 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 xed modes,
the level control on the front of the Model 354A will
not impact the level of the monitor output. (The audio
signal is presented to the analog monitor output cir-
cuitry before (“pre”) the level control.)
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 unconnected. 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 Conguration
For audio to pass to and from the Model 354A requires
conguration of several Dante-related parameters.
These configuration settings are stored in non-
volatile memory within the Model 354A’s circuit-
ry. Dante parameter configuration 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 avail-
able to support the Windows
®
and macOS
®
operating
systems.
The Model 354A’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 354A and
related parameters may need to be congured.
Audio Routing
The Model 354A 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 subscribed (routed) to the desired Dante
receiver (input) channels. This achieves routing of the
Model 354A’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 the devices that supply the
desired Dante transmitter (output) channels. These
four audio input channels can provide the monitor, tal-
ent cue (IFB program or non-interrupt), or background
music signals needed for a specic application. Note
that within Dante Controller a “subscription” is the term
used for routing a transmitter ow (a group of up to
four output channels) to a receiver ow (a group of
input channels).
In advanced applications, the Model 354A’s four
Dante receiver (input) channels can provide “keep
alive” signals that impact operation of the unit’s four
Dante transmitter (output) channels. Together they
can work with a digital processor unit to create a
complete end-to-end solution.
As previously noted, the Model 354A uses an
UltimoX4 integrated circuit to implement its Dante
functionality. The number of ows associated with this
integrated circuit is four; two transmitter (output) and
two receiver (input). (A ow can be unicast, multicast,
or a combination of the two.) With this small number
of ows it’s possible that a ow limitation condition
could occur. If the Model 354A’s Dante transmitter
(output) channels need to be subscribed (routed) to
more than two ows (typically two choices) it’s pos-
sible that an intermediary device, such as the Studio
Technologies’ Model 5422A Dante Intercom Audio
Engine, can be used to “repeat” the signals and gain
many additional ows.

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Model 354A
TALK STATION
Note that when the AES67 mode has been enabled
in the Dante Controller application the Model 354A’s
Dante transmitter (output) channels will only function
in multicast; unicast is not supported.
Unit and Channel Names
The Model 354A has a default Dante device name of
ST-M354A- and a unique su󰀩x. The su󰀩x identies
the specic Model 354A that is being congured. The
su󰀩x’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
channel names can be revised as appropriate for the
specic application.
Device Conguration
The Model 354A 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 Conguration
Typically, the Model 354A’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 xed or static conguration. While
this is a more-involved process than simply letting
DHCP or link-local “do their thing,” if xed addressing
is necessary then this capability is available.
AES67 Conguration – AES67 Mode
Dante Controller allows a Model 354A to be congured
for AES67 operation. This requires the AES67 mode
to be set for Enabled. As previously noted, if AES67
mode is Enabled then the Dante transmitter (output)
channels will use multicast.
Model 354A Clocking Source
While technically the Model 354A can serve as
a Leader clock for a Dante network (as can all
Dante-enabled devices), in most cases the unit will be
congured to receive its timing reference (“sync”) from
another Dante device. As such, the Dante Controller
check box for the Preferred Leader that is associated
with the Model 354A would typically not be enabled.
Model 354A Conguration
The STcontroller software application is used to con-
gure the way in which the Model 354A functions. No
DIP switch settings or other local actions are used
to congure 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 computers
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 354A
units that are to be configured. Immediately after
starting the STcontroller application it will locate all
the Studio Technologies’ devices that it can control.
The one or more Model 354A units to be congured
will appear in the device list.
Use the Identify command to allow easy recognition
of a specic Model 354A unit. Double-clicking on a
device name will cause the associated conguration
menu to appear. Review the current conguration and
make any changes that are desired.
Changes made using STcontroller will be immediately
reected in the unit’s operation; no Model 354A reboot
is required. Each time a change is made the four talk
pushbutton switches on the Model 354A’s front panel
will ash orange in a distinctive pattern to indicate
that a command from STcontroller has been received.

Issue Preliminary 1, April 2023 Model 354A User Guide
Page 12 Studio Technologies, Inc.
Model 354A
TALK STATION
General Menu Page
The following conguration selections are available in the General menu selections tab:
Microphone Input – Preamplier Gain
The gain of the preamplier associated with the
gooseneck microphone will operate from among
ve congurable choices:
12 dB, 18 dB, 24 dB, 30 dB, and 36 dB.
The compressor active LED, located on the unit’s
back panel, can act as a guide when setting the pre-
amplier gain. The default value of 24 dB will typically
be appropriate for use with the Studio Technologies’
GME-3-12 Gooseneck Microphone.
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 24 dB, it might
be a good idea to change the gain setting to 30 dB or
36 dB. If the compressor LED is lit fully during normal
talking and the gain is set for 30 or 36 dB, a change
to one of the lower gain values might be warranted.
System – Button LED Intensity
Choices are Low and High.
Under the top surface of each of the four talk push-
button switches is a red and a green LED indicator.
The LED intensity configuration choice allows the
overall 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 354A
is located.

Model 354A User Guide Issue Preliminary 1. April 2023
Studio Technologies, Inc. Page 13
Model 354A
TALK STATION
System – Button LED Action
Choices are Red when O/Green when On
Green when O/Red when On
Unlit when O/Green when On
Unlit when O/Red when On
The action of the red and green LED indicators
associated with the four talk pushbutton switches
can be congured. (There are two red and two green
LEDs in each of the talk pushbutton switches.) The
talk pushbutton switches are congured as a group,
all acting in the same manner. The third and fourth
choices were specically provided to support users
who have limitations in their ability to discern between
two colors (“color blindness”).
Red when O󰀨/Green when On: The LEDs in each
talk pushbutton switch will light red when its associ-
ated function is o󰀨 (not active). The LEDs in each talk
pushbutton switch will light green when its associated
function is on (active).
Green when O󰀨/Red when On: The LEDs in each
talk pushbutton switch will light green when its associ-
ated function is o󰀨 (not active). The LEDs in each talk
pushbutton switch will light red when its associated
function is on (active).
Unlit when O󰀨/Green when On: The LEDs in each
talk pushbutton switch will not light when its associat-
ed function is o󰀨 (not active). The LEDs in each talk
pushbutton switch will light green when its associated
function is on (active).
Unlit when O󰀨 / Red when On: The LEDs in each
pushbutton switch will not light when its associated
function is o󰀨 (not active). The LEDs in each push-
button switch will light red when its associated function
is on (active).
Monitor Output – Overall Level
The functioning of the analog and Dante monitor
outputs can be congured from among three
choices:
Fixed –10 (Pre-Fader)
Fixed 0 (Pre-Fader)
Adjustable (Post-Fader)
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 354A Dante
receiver (input) channel at –20 dBFS will result in an
analog monitor output level of –10 dBu and, when
enabled, a digital monitor output level of –30 dBFS.
This setting would be appropriate when one of the
monitor outputs is being connected to an amplied
speaker which includes input gain and a level control.
This conguration also may be appropriate when the
input of a Fostex 6301-series amplied loudspeaker is
connected to the Model 354A’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 amplied loudspeaker.
Fixed 0 (Pre-Fader): If selected, 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 354A’s front-panel rotary level control. This
setting would be appropriate when the analog monitor
or Dante monitor output signals are being used with
equipment that requires a higher nominal line-level
signal.
Adjustable (Post-Fader): When this mode is
selected, the rotary level control will impact the level
of the analog monitor output and, when enabled,
Dante monitor output. The rotary level control, with a
push-in/push-out knob action, is located on the front
of the Model 354A’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. (This is applicable when the associated Dante
input signal has a nominal level of –20 dBFS.) The
rotary level control will cause an attenuation action
on the monitor outputs as the knob is turned in its
counterclockwise (CCW) direction. The analog and
digital monitor outputs will be fully muted when the
rotary level control is set to its fully counterclockwise
(CCW) position.

Issue Preliminary 1, April 2023 Model 354A User Guide
Page 14 Studio Technologies, Inc.
Model 354A
TALK STATION
Monitor Output – Audio Source
Choices are None, Ch 1, Ch 2, Ch 3, Ch 4, and
Selectable.
This configuration selection relates to the audio
source that is associated with the analog monitor
output and, when enabled, the Dante monitor output.
None: When selected, the analog monitor output will
be disabled, the Dante monitor output function will
be disabled, and Dante transmitter (output) channel
4 will be used for the functions associated with talk
channel 4.
Ch 1, Ch 2, Ch 3, or Ch 4: When selected, the spec-
ied Dante receiver (input) channel will be used as
the source for the analog monitor output. It will also
be used as the source for the Dante monitor function,
if enabled, which is associated with Dante transmitter
(output) channel 4.
Selectable: When selected, this allows the user
to choose the Dante receiver (input) channel (1, 2,
3, or 4) to serve as the source for the analog moni-
tor output. The selected source will also be used by
the Dante monitor output if that function has been
enabled.
Monitor Output – Dim when Preamble
or Mic Active
Choices are 0 dB, 5 dB, 10 dB, 15 dB,20 dB, and
Full Mute.
This conguration 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 talk microphone audio is active. It is provided
primarily to prevent audio crosstalk and acoustical
feedback that could occur between a connected
gooseneck microphone and an adjacent monitor
loudspeaker. Selecting 0 dB would e󰀨ectively serve
to disable this function. (Reducing the level of some-
thing by 0 dB would not cause any change to occur.)
Selecting Full Mute would e󰀨ectively make this func-
tion be a monitor output mute.
Monitor Output – Preamble Audio Level
Choices are O, Low, Medium Low, Medium,
Medium High, and High.
To assist a Model 354A 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 loud-
speaker and, if applicable, prepare to make a voice
announcement.
Monitor Output – Microphone Audio
Level
Choices are O, Low, Medium Low, Medium,
Medium High, and 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 conrmation of
what action is occurring. If enabled, the microphone
audio signal, when active, would be sent to the
analog monitor output and, if congured, the Dante
Ch 4/Monitor output transmitter (output) channel.
When congured for O no microphone audio will be
sent to either monitor output. The ve other choices
allow microphone audio to be sent to the monitor out-
puts at various levels. Note that selecting a level that’s
too high can result in acoustic feedback between the
connected gooseneck microphone and an associated
monitor loudspeaker.
Preamble Audio – File 1 Level Trim
Choices are –12 dB,–9 dB,–6 dB,–3 dB,0 dB,
3 dB,6 dB,9 dB, and 12 dB.
The preamble function allows a stored audio source
(in the form of a WAV le) to be sent out the desig-
nated Dante transmitter (output) channels. This con-
guration setting allows the playback level of File 1
to be adjusted (“trimmed”) from among nine available
choices. (The level of the preamble audio provided
in File 1 will be adjusted relative to the microphone
audio level.) A negative value indicates that the level
of the le will be reduced. Selecting 0 dB would cause
no level change to be made to File 1. And a positive
selection will cause gain to be added to the level of
the information stored in File 1. This conguration
choice allows

Model 354A User Guide Issue Preliminary 1. April 2023
Studio Technologies, Inc. Page 15
Model 354A
TALK STATION
Preamble Audio – File 2 Level Trim
Choices are –12 dB,–9 dB,–6 dB,–3 dB,0 dB,
3 dB,6 dB,9 dB, and 12 dB.
These conguration choices function the same as the
conguration that applies to File 1.
Preamble Audio – Allow Update of Files
Choices are No and Yes.
A USB ash drive can be used to load preamble les
into the Model 354A’s non-volatile storage. This is a
fast and simple means of revising the two audio (WAV)
les as desired. A USB Type A receptacle is located
on the unit’s back panel and is compatible with most
commonly available ash drives. This conguration
setting determines whether or not the Model 354A will
load WAV les that are stored on a USB ash drive.
When congured for No the unit will ignore preamble
les that are present on a connected USB ash drive.
New audio les can only be loaded when Yes has
been selected.

Issue Preliminary 1, April 2023 Model 354A User Guide
Page 16 Studio Technologies, Inc.
Model 354A
TALK STATION
Channel Specic Menu Page
The following conguration selections apply individually to Channels 1-4. They are available in each Channel
Specic column:
Button Action
The manner in which the talk pushbuttons function
will be congured from among four choices:
Momentary, Tap to Latch, Momentary/Tap to Latch,
and Disabled. (Channel 4 also provides a fth
choice: Disabled (Dante Monitor Output Enabled.)
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, whenever the
button is pressed its function will alternate between its
active and inactive states. Upon Model 354A 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 354A 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 ash, indicating that it has been disabled.
Disabled (Dante Monitor Output Enabled):When
Channel 4 is selected for Disabled, the Dante trans-
mitter (output) channel 4 will be used for the Dante
monitor output.

Model 354A User Guide Issue Preliminary 1. April 2023
Studio Technologies, Inc. Page 17
Model 354A
TALK STATION
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 talk channel’s push-
button switch becomes active will follow this cong-
uration. The seven available modes are unique and
warrant a careful review before a selection is made.
Mic Audio Only: In this mode, whenever the chan-
nel’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 le will
be sent to the Dante transmitter (output) channel. After
the preamble audio le has played once the micro-
phone audio will become active. Just to clarify, during
the time that the preamble le is playing, audio from
the microphone will not be sent to the Dante transmit-
ter (output) channel. Only after the preamble le 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
le 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.
Preamble Audio Only (Play Once, Interruptible):
In this mode, when the channel’s pushbutton switch
becomes active the selected preamble audio le will
play once and then stop. Changing the pushbutton
switch to its inactive state when the preamble audio
le 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 le will
play once and then stop. Changing the pushbutton
switch to its inactive state when the preamble audio
le is actively playing will not cause it to stop. The
preamble audio le 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
le will play continuously. Changing the pushbutton
switch to its inactive state when the preamble audio
le 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 le will play continuously. Changing the push-
button switch to its inactive state when the preamble
audio le is actively playing will not cause it to imme-
diately stop. The preamble audio le will play until it
ends and only then will it stop.
Preamble Audio Source
Choices are File 1 and File 2.
The Model 354A can store and play two independent
audio (WAV) les. These are called preamble audio
les and are loaded into the unit using a USB ash
drive. This conguration selection determines which
of the two les is assigned to a specic pushbutton
switch function.
Program Audio Source
Choices are None, Ch 1, Ch 2, Ch 3, and 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 some applications, it’s possible that a program
audio source will not be assigned to a Dante trans-
mitter (output) channel. In this situation, the selection
of None would be correct. For a typical voice paging
application this conguration determines which audio
signal would be sent to a paging zone as its back-
ground music source. For broadcast applications
where talent cue (interrupted foldback or IFB) signals
need to be created 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.

Issue Preliminary 1, April 2023 Model 354A User Guide
Page 18 Studio Technologies, Inc.
Model 354A
TALK STATION
Program Audio Dim
Choices are 0 dB, 5 dB, 10 dB, 15 dB, 20 dB, and
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 congure 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 (add-
ed or summed) with the program audio. When Full
Mute is selected the program audio source will fully
attenuate (completely mute) whenever the preamble
and/or microphone audio is active. In voice paging
applications it would be typical to select 5 dB or
10 dB for the program audio dim, reducing but not
muting a background music source when the pre-
amble or microphone function is active. In most
broadcast applications 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 354A can be congured to support a num-
ber of interesting applications through the generation
of high-frequency sine-wave audio tones that are
added to the Dante transmitter (output) channels. The
presence of these tones can be selected such that the
status of a Model 354A 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 also
be programmed to respond to the audio tones.
None: In this mode, no channel status signals (tones)
will be added to an 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” trigger
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 function is inactive
then a 20 kHz tone will be sent out the associated
Dante transmitter (output) channel. When the pre-
amble and/or microphone audio function is active an
18 kHz tone will be combined with them and sent out.
The 20 kHz 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 operates harks back to the days of analog 4-wire
telephone trunk circuits. An “idle” trunk would have a
continuous mid-band 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. The 18 kHz
tone indicates to connected equipment that active
audio content is present on the Dante transmitter
(output) path.
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 354A 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 micro-
phone audio is active then no tone will be sent out
the Dante transmitter (output) channel. This choice

Model 354A User Guide Issue Preliminary 1. April 2023
Studio Technologies, Inc. Page 19
Model 354A
TALK STATION
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
di󰀨erent tones that represent the status of both the
Dante receiver (input) channel and the associated
Dante transmitter (output) channel. When the Dante
receiver (input) channel associated with a specic
channel doesn’t have a high-frequency tone present
the Model 354A considers this to be a receiver chan-
nel 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
354A considers this to be a receiver channel active
condition. If the receiver channel is active and pre-
amble 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
applicable tone always combines (mixes or sums)
with the other audio signals that are 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 processing device
to recognize the complete operating status of a Model
354A’s receiver and transmitter channel.
Call Receive Action
This section has three congurable choices:
None
Button Lights when Call Received, Button Action
Normal
Button Lights when Call Received, Button Action
Disabled
This function congures the manner in which a Model
354A’s talk channel button will light and how the but-
ton will operate when a high-frequency audio signal
is detected as part of an associated Dante receiver
(input) channel. This was included such that multiple
Model 354A units could be deployed in an application,
display the active status of each other and, if desired,
inhibit button operation.
None: When this mode is selected, the channel’s
button LEDs will not respond to the presence of
a high-frequency signal in its associated Dante
receiver (input) channel. The button action will never
be changed from the manner in which it has been
congured.
Button Lights when Call Received, Button Action
Normal: When this mode is selected, the channel
button’s LEDs will flash orange whenever a high-
frequency signal is detected in the associated Dante
receiver (input) channel. Operation of the button will
continue to follow its congured action.
Button Lights when Call Received, Button Action
Disabled: When this mode is selected, the channel
button’s LEDs will flash orange whenever a high-
frequency signal is detected in the associated Dante
receiver (input) channel. The action of the button
will be disabled whenever a high-frequency signal is
being detected.
Preamble Audio Files
As previously discussed, two audio “messages,”
each up to 40 seconds in length, can be stored in
non-volatile memory within the Model 354A. These
are referred to as the preamble audio les and in the
16-bit, 48 kHz sample rate, monoaural WAV format.
Conguration choices determine how and when the
preamble audio les will be played during Model 354A
operation. The preamble audio les within the Model
354A can be easily updated by way of a standard USB
ash drive. The preamble audio les can contain what-
ever audio content is desired to best support various
applications. The content could consist of the sound
of natural bells or chimes, an “electronically created”
audio sequence, or a voice message. By using the
common WAV le format, the desired audio sources
can be created outside of the Model 354A and then
easily loaded into the unit.
Creating Preamble Audio Files
Audio content can be captured or created using
standard audio techniques. Natural sounds or voice
messages can be recorded. Alternately, audio signals
can be “synthesized” as desired. To prepare this audio
content for loading into the Model 354A requires that
they be in the 16-bit, monaural, 48 kHz sample rate,
WAV (.wav) format. For compatibility with the Model
354A, the names of the two preamble audio les must
be M354ATone1.wav and M354ATone2.wav.

Issue Preliminary 1, April 2023 Model 354A User Guide
Page 20 Studio Technologies, Inc.
Model 354A
TALK STATION
Studio Technologies has had good success using the
open-source audio software from Audacity
®
to create
compatible preamble audio les. It’s available free of
charge at audacityteam.org. However, many other
compatible audio recording and editing programs
are available for use with various personal computer
operating systems.
It’s expected that Studio Technologies will create a
“library” of preamble audio les. These will be avail-
able for download, free of charge, to interested parties.
Refer to the Studio Technologies’ website for what les
are currently available. If you create interesting WAV
les for your application, we encourage you to share
them with other Model 354A users. Please submit the
les, along with a detailed description of their content,
to the Studio Technologies support email address.
They’ll be added to the website (studio-tech.com),
making them easily accessible to others.
Loading Preamble Audio Files
The Model 354A has the ability to load installer-
created WAV files into non-volatile memory by
way of a standard USB ash drive. The Model 354A
implements a USB host function and provides access
by way of a type A receptacle located on the unit’s
back panel. The Model 354A updates its preamble
audio les using the names M354ATone1.wav and
M354ATone2.wav.
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. One or both of the preamble audio les can be
automatically loaded into the Model 354A at the same
time. In the ash drive’s root directory, save the de-
sired new rmware le(s), ensuring that the required
name(s) are specied. The le name for preamble
audio le 1 must be M354ATone1.wav. The le name
for preamble audio le 2 must be M354ATone2.wav.
After copying les to the USB ash drive, be certain
to use the OS system’s eject command to ensure that
they are correctly stored.
Once the USB ash drive is inserted into the USB
receptacle, located on the Model 354A’s back panel,
the unit must be powered o󰀨 and again powered on.
At this point the le(s) will automatically load. To install
either or both preamble audio les follow these steps:
1.Remove power from the Model 354A. This will
entail removing the PoE Ethernet connection from
the etherCON RJ45 jack that’s located on the unit’s
back panel.
2. Locate the USB receptacle, labeled WAV Audio
Files and Firmware Update, on the Model 354A’s
back panel (older units might be labeled Firmware
Update). Directly adjacent to the USB receptacle is
a small hole that provides visual access to a green
LED indicator.
3. Insert the prepared USB ash drive into the USB
receptacle.
4.Apply Power-over-Ethernet (PoE) power to the
Model 354A by connecting the Ethernet interface
cable to the unit’s RJ45 jack.
5. After a few seconds the Model 354A will run a “boot
loader” program that will automatically load and save
the new preamble audio le(s) that are present on
the USB ash drive. The update process can range
from approximately 5 seconds to approximately 45
seconds. The actual time will depend on the le’s
size (up to 40 seconds of audio playback) and num-
ber of WAV les (one or two) that are being loaded.
While the le(s) are being loaded the green LED,
located adjacent to the USB receptacle, will ash
slowly. Talk pushbutton switches 1 and 2 on the front
panel will indicate the status of the loading process.
They will ash orange when the loading processing
is taking place. They will light green if the one or two
preamble audio les were successfully loaded. They
will light red it the loading process was not success-
ful. Once the le-loading process has completed the
Model 354A will restart. For details on the manner
in which the talk button LEDs will light refer to the
Operation section.
6. At this time the Model 354A will be functioning with
the newly loaded preamble audio le(s). The USB
ash drive can now be removed. But to be conserva-
tive, rst remove the PoE Ethernet connection, then
remove the USB ash drive, and then reconnect the
PoE Ethernet connection.
7. Conrm that the desired preamble audio le(s) have
been loaded into the Model 354A. This will typically
require listening to one or two of the Dante trans-
mitter (output) audio channels. The actual channels
that utilize the preamble les will depend on how
the Model 354A has been configured using the
STcontroller application.