Studio Technologies 381 Manual de usuario
Copyright © 2021 by Studio Technologies, Inc., all rights reserved
studio-tech.com
User Guide
Issue 4, March 2021
This User Guide is applicable for serial numbers
M381-00151 and later with application firmware 2.1 and later
50663-0321, Issue 4
Model 381 On-Air Beltpack
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Model 381 User Guide Issue 4, March 2021
Studio Technologies, Inc. Page 3
MODEL 381
ON-AIR BELTPACK
Table of Contents
Revision History ........................................................... 4
Introduction ................................................................... 5
Getting Started ............................................................. 8
Operation ...................................................................... 14
Technical Notes ............................................................ 19
Specifications ............................................................... 23
Appendix A ................................................................... 24
Issue 4, March 2021 Model 381 User Guide
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MODEL 381
ON-AIR BELTPACK
Revision History
Issue 4, March 2021:
• Improvements to formatting and terminology.
Issue 3, February 2021:
• Documents revisions and additions to talkback button modes.
Issue 2, March 2020:
• Revised nomenclature associated with operation of talkback button.
Issue 1, January 2019:
• Initial release.
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MODEL 381
ON-AIR BELTPACK
Introduction
The Model 381 On-Air Beltpack offers a
unique combination of audio resources
to directly support a complete broadcast
“stand-up” on-air position. Using Dante®
audio-over-Ethernet technology, the unit
provides main and talkback output channels,
talent cue (IFB) input, and sidetone capabili-
ties, as well as essential user controls in
a compact, portable package. The Model
381 is compatible with the Dante Domain
Manager™ (DDM) software application and
is AES67-compliant for direct integration into
many contemporary networked audio appli-
cations.
Optimized for broadcast sports and live en-
tertainment events, eSports, news-gathering,
and streaming broadcast applications, the
Model 381 allows incredibly simple deploy-
ment while maintaining “pro” audio quality
and an intuitive user experience. With just
a Power-over-Ethernet (PoE) connection, a
dynamic or phantom-powered microphone,
and a pair of headphones or an earpiece,
the unit will be ready for “on-air” deploy-
ment. The STcontroller software application
is used for configuring operating parameters
including microphone preamplifier gain, P48
phantom power, headphone signal routing,
sidetone operation, and talkback button
action. The Model 381’s audio quality is
excellent, with low distortion, low noise, and
high headroom. Careful circuit design and
rugged components ensure long, reliable
operation.
Applications
The Model 381 provides an “all-Dante” solu-
tion for one on-air talent location. Two Dante
audio input channels supply the user with
their talent cue (IFB) signals. Should the cue
signal be “mix-minus” an integrated sidetone
function can provide the user with a micro-
phone confidence signal. Two Dante audio
output channels, one designated as main
(for “on-air” use) and the other talkback, are
routed via the associated local-area network
(LAN) to inputs on Dante-compatible de-
vices. A pushbutton switch, located on the
Model 381’s top panel, provides a combina-
tion talkback and “cough” function. Five con-
figuration choices allow the exact action of
the talkback button and associated function
to be selected. Choices include whether or
not the Dante main output channel is muted
when talkback is active as well as offering
the ability to disable the button. The audio
switching is performed in the digital domain
and is virtually “click-free.”
Figure 1. Model 381 On-Air Beltpack top and bottom views
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MODEL 381
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Setup and Operation
Set up and operation of the Model 381 is
simple. An etherCON® 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 broadcast headset or handheld (“stick”)
microphone can be directly connected to the
unit’s 3-pin XLR microphone input connec-
tor. This input is compatible with dynamic or
condenser microphones. An integrated P48
phantom power source can be enabled if
desired. Stereo headphones, the headphone
connections from a stereo or monaural
headset, or even a monaural earpiece are
connected to the headphone output jack.
Two “push-in/push-out” rotary controls (po-
tentiometers or “pots”) make it easy to set
the level of the talent cue signals level being
sent to the 2-channel headphone output.
The STcontroller software application is
used to configure the wide range of Model
381 operating parameters. This allows the
unit’s performance to be optimized to meet
the needs of specific applications. The
Model 381’s ultra-compact enclosure is
made from an aluminum alloy which offers
both light weight and ruggedness. A stain-
less steel “belt clip,” located on the back
of the unit, allows direct attachment to a
user’s clothing. The top surface is curved
to minimize the chance of the unit interfering
with clothing or being readily observable
“on camera.”
Ethernet Data and PoE
The Model 381 connects to a local area net-
work (LAN) by way of a standard 100 Mb/s
twisted-pair Ethernet interface. The physical
100BASE-TX interconnection is made by
way of a Neutrik® etherCON RJ45 connec-
tor. While compatible with standard RJ45
plugs, etherCON allows a ruggedized and
locking interconnection for harsh or high-
reliability environments. The Model 381’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 381’s PoE
interface enumerates (reports) to the power
sourcing equipment (PSE) that it’s a class 2
(low power) device.
Dante Audio-over-Ethernet
Audio data is sent to and received from
the Model 381 using the Dante audio-over-
Ethernet media networking technology.
The Model 381’s two Dante transmitter
(output) and two Dante receiver (input) audio
channels can be assigned to other devices
(routed) using the Dante Controller software
application. The Dante transmitter (output)
and receiver (input) channels are limited to
supporting four Dante flows, two in each di-
rection. The digital audio’s bit depth is up to
24 with a sampling rate of 44.1, 48, 88.2, or
96 kHz. Two bi-color LEDs provide an indi-
cation of the Dante connection status.
The Model 381 is compatible with the AES67
interoperability standard. In this mode the
two transmitter (output) channels will func-
tion in multicast; unicast is not supported.
In addition, the unit is compatible with the
Dante Domain Manager (DDM) software
application.
Audio Quality
The Model 381’s performance is completely
“pro,” making it appropriate for use in a
wide-range of applications. A low-noise, wide
dynamic-range microphone preamplifier
and associated voltage-controlled-amplifier
(VCA) dynamics controller (“compressor”)
circuit ensures that mic input audio quality
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MODEL 381
ON-AIR BELTPACK
is preserved while minimizing the chance
of signal overload. A configuration choice
allows selection of the signal source for the
Dante main output channel. The choices
are either the output of the microphone
preamp or the output of the compressor
circuit. These choices are referred to as
“pre-compressor” or “post-compressor.” The
ADC section utilizes a high-performance
integrated circuit that supports sampling
rates of 44.1, 48, 88.2, and 96 kHz with
a bit depth of up to 24. The audio signal,
now in the digital domain, routes through a
32-bit microprocessor and on to the Dante
interface section where it is packetized and
prepared for transport over Ethernet.
Audio input signals arrive via the Dante
receiver (input) channels and pass into the
Model 381’s microprocessor. As with the
Dante audio output channels, the sampling
rate can be 44.1, 48, 88.2, or 96 kHz with
a bit depth of up to 24. Channel routing,
headphone level control, and sidetone cre-
ation are performed in the digital domain.
This provides flexibility, allows precise con-
trol, and keeps the two controls from having
to directly handle analog audio signals.
The audio channels destined for the head-
phone output channels are sent to a high-
performance digital-to-analog converter
and then on to robust driver circuitry. High
signal levels can be provided to a variety
of headsets, headphones, and earpieces.
Configuration Flexibility
The Model 381 can be configured to meet
the needs of specific applications and user
preferences. All configuration tasks are
performed using the STcontroller personal
computer software application which is
available free of charge on the Studio
Technologies website. There are no
mechanical switch settings or button-press
sequences required to configure how the
unit functions. Selectable parameters in-
clude microphone preamplifier gain, P48
phantom power on/off, headphone output
performance, sidetone operation, talkback
button operation, and main output audio
source.
The gain of the microphone preamplifier
can be selected from among five choices.
This allows the Model 381 to match the out-
put sensitivity of a range of handheld and
headset-associated microphones. A low-
noise source of P48 phantom power can
be enabled if required to support condenser
(capacitor) microphones. The two Dante re-
ceiver (input) audio sources and the way in
which they are assigned to the headphone
output channels can be configured. In addi-
tion, the operation of the two rotary controls
can be selected. These unique choices al-
low almost any required headphone moni-
toring situation to be implemented. Whether
for use in on-air sports, in an eSports
broadcast, or as a production support tool,
the Model 381 should be able to achieve
the desired configuration.
The integrated sidetone function can be
configured to operate from among three
choices. This allows audio associated with
the output of the microphone preamplifier
to be returned to the headphone output
as required. Sidetone can be important as
some applications may provide a “mix-
minus” talent cue signal that doesn’t include
the user’s own voice content. A configura-
tion selection allows the talkback button
and associated function to be selected
from among five choices, including having
the ability to be disabled. The Dante main
output channel can be selected to have its
audio source be pre (before) or post (after)
the dynamics control circuitry.
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MODEL 381
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Future Capabilities and
Firmware Updating
The Model 381 was designed so that its ca-
pabilities and performance can be enhanced
in the future. A USB connector, located on
the unit’s main circuit board (underneath the
unit’s cover), allows the application firmware
(embedded software) to be updated using a
USB flash drive.
The Model 381 uses Audinate’s Ultimo™
integrated circuit to implement the Dante
interface. The firmware in this integrated
circuit can be updated via the Ethernet con-
nection, helping to ensure that its capabilities
remain up to date.
Getting Started
What’s Included
Included in the shipping carton will be a
Model 381 On-Air Beltpack and instructions
on how to obtain an electronic copy of this
guide. As a device that is Power-over-
Ethernet (PoE) powered, no external
power source is provided.
Connections
In this section signal interconnections will
be made using the three connectors located
on the bottom of the Model 381’s enclosure.
An Ethernet data connection with Power-
over-Ethernet (PoE) capability will be made
using either a standard RJ45 patch cable
or an etherCON protected RJ45 plug. A
microphone will be connected using a cable-
mounted 3-pin male XLR connector. A set of
headphones or an earpiece will be connect-
ed by way of a 2- or 3-conductor ¼-inch plug.
Ethernet Connection with PoE
A 100BASE-TX Ethernet connection that
supports Power-over-Ethernet (PoE) is
required for Model 381 operation. This one
connection will provide both the Ethernet
data interface and power for the Model
381’s circuitry. A 10BASE-T connection is
not sufficient as Dante does not support
this Ethernet protocol. And a 1000BASE-T
(GigE) connection is not supported unless it
can automatically “fall back” to 100BASE-TX
operation. The Model 381 supports Ethernet
switch power management, enumerating
itself as a PoE class 2 device.
The Ethernet connection is made by way
of a Neutrik etherCON protected RJ45 con-
nector that is located on the bottom of the
Model 381’s enclosure. This allows connec-
tion by way of a cable-mounted etherCON
connector or a standard RJ45 plug. The
Model 381’s Ethernet interface supports auto
MDI/MDI-X so that a “cross-over” or “revers-
ing” cable will never be required.
Microphone Input
The Model 381 provides a 3-pin female XLR
connector which allows a balanced dynamic
or phantom-powered condenser microphone
to be connected. The microphone can be a
standalone handheld (“stick”) type or can be
part of a broadcast-style headset. The Model
381’s microphone input is directly compat-
ible with balanced dynamic or P48 phantom
powered microphones. A microphone should
be connected such that its common is on
connector pin 1, its signal high (+) is on con-
nector pin 2, and its sign low (–) is on con-
nector pin 3. An STcontroller configuration
setting allows the P48 microphone power
sources to be enabled or disabled as de-
sired. Details on configuring the unit will be
described later in this guide.
Headphone Output
The Model 381 provides a 2-channel
(“stereo”) headphone output by way of a
3-conductor ¼-inch phone jack. Devices
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MODEL 381
ON-AIR BELTPACK
such as stereo headphones or “dual-ear”
broadcast-style headsets can be directly
connected using a 3-conductor ¼-inch
plug. Following the usual convention the
left channel should be terminated on the
tip lead, the right channel on the ring lead,
and common on the sleeve lead.
It’s also possible to use a monaural (“single-
ear”) headset or broadcast-type single
earbud as long as sufficient care is taken.
If a 3-conductor ¼-inch plug is used by the
device it should be wired such that the tip
lead is connected to the positive terminal
of the transducer and the sleeve lead is
connected to the negative or common lead
of the transducer; the plug’s ring should
be left unconnected. But it’s also likely that
the monaural device will be terminated on
a 2-conductor (tip and sleeve) ¼-inch plug.
When a plug of this type is inserted into the
Model 381’s headphone output connector
(jack) the Model 381’s right headphone out-
put channel will be shorted. (This will occur
since the ring lead will be directly shorted to
the sleeve lead.) This can lead to stress on
the Model 381’s right channel headphone
output circuitry as well as drawing extra cur-
rent from the output stage. To prevent this
condition the Headphone Output – Controls
(A/B) mode configuration choice should be
set for Single-Channel Mono. This disables
the right headphone output channel and
sends the listen audio source or sources
only to the left headphone output channel.
Refer to a later section in this guide for de-
tails on configuring the headphone output.
Dante Configuration
For audio to pass to and from the Model
381 requires configuration of several
Dante-related parameters. These configu-
ration settings will be stored in non-volatile
memory within the Model 381’s circuitry.
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 available to support Windows and OS X®
operating systems. The Model 381 uses the
Ultimo 2-input/2-output integrated circuit to
implement the Dante architecture.
The two Dante transmitter (output) channels
associated with the Model 381’s Dante inter-
face must be assigned to the desired receiver
(input) channels. This achieves routing the
Model 381’s two output audio channels to the
device (or devices) that will be “listening” to
them. Within Dante Controller a “subscrip-
tion” 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 number of transmitter flows associated
with an Ultimo integrated circuit is limited to
two. These can either be unicast, multicast,
or a combination of the two. If the Model
381’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.
The two Dante receiver (input) channels as-
sociated with the Model 381’s audio inputs
also need to be subscribed (routed) with the
desired Dante transmitter (output) channels.
These two audio signals will provide a Model
381 user with their headphone cue signals.
The Model 381 has a default Dante device
name of ST-M381- and a unique suffix.
The suffix identifies the specific Model 381
that is being configured. The suffix’s actual
alpha and/or numeric characters relate to
the MAC address of the unit’s Ultimo
integrated circuit. The two Dante transmitter
(output) channels have default names of
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MODEL 381
ON-AIR BELTPACK
Main and Talkback. The two Dante re-
ceiver (input) channels have default names
of Headphone Ch1 and Headphone Ch2.
Using Dante Controller, the default device
name and channel names can be revised
as appropriate for the specific application.
The Model 381 supports audio sample
rates of 44.1, 48, 88.2, and 96 kHz. A set-
ting in Dante Controller is used to configure
the desired sample rate. The Model 381
can serve as the Leader clock for a Dante
network but in most cases, it will be config-
ured to “sync” to another device. No clock
configuration settings associated with the
Model 381 will typically require configura-
tion within Dante Controller.
Model 381 Configuration
The STcontroller software application is
used to configure the way in which the
Model 381 functions. No DIP switch set-
tings or other local actions are used to
configure the unit. This makes it impera-
tive that STcontroller be available for con-
venient use in a personal computer that’s
connected to the related LAN.
Installing STcontroller
STcontroller is available free of charge
on the Studio Technologies website
(studio-tech.com/stcontroller). If required,
download and install STcontroller onto a
designated personal computer. This per-
sonal computer must be on the same local
area network (LAN) and subnet as the
Model 381 unit or units that are to be
configured. Immediately after starting
STcontroller the application will locate the
devices that it can control. The Model 381
unit or units will appear in the device list.
Use the Identify command to allow easy
recognition of a specific Model 381 unit.
Double-clicking on a device name will
cause the associated configuration menu
to appear. Review the current configuration
and make changes as required.
Parameters
The configurable functions include:
• P48 phantom power on/off status
• Microphone preamplifier gain
• Headphone output routing and level
control operation
• Sidetone operation and level
• Talkback button operation
• Main output audio source
Changes made using STcontroller will be
immediately reflected in the unit’s operation.
No “reboot” of the Model 381 is required.
Each time a change is made the talkback
button on the top panel will flash orange in
two quick sequences to indicate that a com-
mand from STcontroller has been received.
Microphone Input – P48 Phantom Power
STcontroller allows selection of the on/off
status of the microphone input’s P48 phan-
tom power source. The on/off status is
displayed by way of an LED, red in color,
located on the bottom panel adjacent to
the microphone input connector. Select the
status of the P48 source to meet the needs
of the connected microphone.
Microphone Input – Gain
Choices are 36 dB, 42 dB, 48 dB, 54 dB,
and 60 dB.
The gain of the Model 381’s microphone
preamplifier can be selected from among
five choices. The compressor active LED,
orange in color and visible on the bottom of
the Model 381’s enclosure adjacent to the
microphone input connector, can act as a
guide when setting the preamp gain. When
a voice signal at a normal level is present
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