Studio Technologies 370 Manuale utente
Copyright © 2017 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50621-0517, Issue 3
This User Guide is applicable for serial numbers:
• M370-00251-02000 with application firmware 2.2 and later
and Dante firmware 2.0 (Ultimo 3.10.1.12) and later
• M370-02001 and later with application firmware 2.2 and later
and Dante firmware 3.0 (UltimoX2 3.10.3.1) and later
Model 370 Intercom Beltpack
User Guide
Issue 3, May 2017
This page intentionally left blank.
Model 370 User Guide Issue 3, May 2017
Studio Technologies, Inc. Page 3
Table of Contents
Revision History ............................................................ 4
Introduction ................................................................... 5
Getting Started .............................................................. 7
Operation ...................................................................... 12
Technical Notes ............................................................. 15
Specifications ................................................................ 19
Issue 3, May 2017 Model 370 User Guide
Page 4 Studio Technologies, Inc.
Revision History
Issue 3, May 2017:
1. Documents revised call light function. Documents added action when identify command
is active.
Issue 2, August 2016:
1. Released strictly for incorporating typographical corrections and enhanced
explanations.
Issue 1, April 2016:
1. Initial release.
Model 370 User Guide Issue 3, May 2017
Studio Technologies, Inc. Page 5
Introduction
The Model 370 Intercom Beltpack starts
with the features required of traditional
broadcast 2-channel party-line (PL) inter-
com user devices and adds the advanced
performance and capabilities that Dante
audio-over-Ethernet provides. Over a stan-
dard IP network, multiple Model 370 units
can be used in PL intercom applications
with help from an external Dante-enabled
audio matrix. Or, units can be used “point-
to-point” or directly interfaced with ports
on compatible matrix intercom systems.
Only a single Power-over-Ethernet (PoE)
connection is required for operation. Key
user features can be easily configured
including preamplifier gain, talk button
operation, and headphone signal routing.
User features include integrated sidetone,
remote microphone off, and call alerting.
This capability, along with the great audio
quality provided by the digital audio signal
path, offers a superior user experience.
Set up and configuration of the 2-channel
Model 370 is simple. An etherCON® RJ45
jack is used to interconnect with a standard
twisted-pair Ethernet port associated with
a local-area network (LAN). This connec-
tion provides both power and bidirectional
digital audio. A broadcast or intercom-style
stereo or monaural headset with a dynamic
microphone interfaces to the unit using a
5-pin XLR connector. Five DIP switches
are used to establish the unit’s operating
parameters. Two “push-in/push-out” rotary
level controls make it easy to set the head-
phone output volume as well as maintain-
ing the desired settings. The Model 370’s
enclosure is made from an aluminum alloy
which offers both light weight and rugged-
ness. A stainless steel “belt clip,” located
on the back of the unit, allows direct attach-
ment to a user’s clothing.
The audio quality of the Model 370’s two
audio channels is excellent, with low distor-
tion, low noise, and high headroom. Careful
circuit design and rugged components en-
sure long, reliable operation. A wide range
of applications can be supported, including
TV, radio, and streaming broadcast events,
corporate and government AV installations,
and post-production facilities.
Dante Audio-over-Ethernet
Audio data is sent to and received from
the Model 370 using the Dante audio-over-
Ethernet media networking technology.
As a Dante-compliant device, the Model
370’s two output (Dante transmitter) and
two input (Dante receiver) audio channels
can be assigned to other devices (routed)
using the Dante Controller software appli-
cation. The Dante transmitter and receiver
channels are limited to supporting four
Figure 1. Model 370 Intercom Beltpack top and bottom views
Issue 3, May 2017 Model 370 User Guide
Page 6 Studio Technologies, Inc.
Dante flows, two in each direction. The
digital audio’s bit depth is 24 with a sam-
pling rate of 48 kHz. Two bi-color LEDs
provide an indication of the Dante connec-
tion status. The Dante Controller’s identify
command takes on a unique role with the
Model 370. Not only will it cause the talk
button LEDs to light in a unique highly vis-
ible sequence, it will also turn off any active
talk channels.
Audio Quality
The Model 370’s completely “pro”
performance really bucks the reputation
of “intercom audio.” A low-noise, wide
dynamic-range microphone preamplifier
and associated voltage-controller-amplifier
(VCA) dynamics controller (compressor)
ensures that input audio quality is pre-
served while minimizing the chance
of signal overload. The output of the micro-
phone preamp and compressor is routed
to an analog-to-digital conversion (ADC)
section that supports a sampling rate of
48 kHz with a bit depth of up to 24. The au-
dio signal, now in the digital domain, routes
through the processor 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 channels and pass into the Model
370’s processor. The sampling rate is
48 kHz with a bit depth of up to 24. Chan-
nel routing, headphone level control, and
sidetone creation are performed in the digi-
tal domain. This provides flexibility, allows
precise control, and keeps the three user
level potentiometers (channel 1, channel 2,
and sidetone) from having to directly han-
dle analog audio signals. The two audio
channels destined for the phones outputs
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, head-
phones, and earpieces.
Call Function
A call function allows Model 370 users to
send and receive channel-specific visual
alert signals. Pressing the dedicated call
button on the top of a unit is all that’s re-
quired to signal other users that attention
is requested. Using 20 kHz tones, the call
signals are sent within the audio chan-
nels (“in band”) allowing interoperability
between multiple Model 370 units as well
as being compatible with legacy party-
line intercom systems. Call signals can
be useful to indicate to users that they are
needed “on headset” or should be actively
listening to an intercom channel. The call
function can also be used to provide real-
time cues to production personnel during
the running of live events.
Configuration Flexibility
A highlight of the Model 370 is its ability to
be easily configured to the meet the needs
of specific users and applications. Five
DIP switches allow control of the micro-
phone preamplifier gain, talk button opera-
tion, and audio routing to the headphone
outputs. The gain of the microphone
preamplifier can be selected from nomi-
nally 40 or 46 dB. This allows compatibility
with dynamic microphones that are part
of many industry-standard broadcast and
intercom headsets. The two pushbutton
switches that control the talk audio on/off
status can be individually configured for
push to talk or push to talk/tap to latch
operation. Two audio channels arrive via
Dante and are destined for the headphone
outputs. Each input can be independently
routed to one or both audio outputs. This
Model 370 User Guide Issue 3, May 2017
Studio Technologies, Inc. Page 7
allows a variety of listening environments
to be created, including dual-channel
monaural.
Ethernet Data and PoE
The Model 370 connects to an Ethernet
data network using a standard 100 Mb/s
twisted-pair Ethernet interface. The physi-
cal interconnection is made by way of a
Neutrik® etherCON RJ45 connector. While
compatible with standard RJ45 plugs,
etherCON allows a ruggedized and lock-
ing interconnection for harsh or high-
reliability environments. An LED displays
the status of the network connection.
The Model 370’s operating power is pro-
vided by way of the Ethernet interface us-
ing the 802.3af Power-over-Ethernet (PoE)
standard. This allows fast and efficient
interconnection with the associated data
network. To support PoE power man-
agement, the Model 370’s PoE interface
reports to the power sourcing equipment
(PSE) that it’s a class 1 (very low power)
device. If a PoE-enabled Ethernet port
can’t be provided by the associated Ether-
net switch a low-cost PoE midspan power
injector can be utilized.
Future Capabilities and
Firmware Updating
The Model 370 was designed so that
its capabilities 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.
To implement the Dante interface the
Model 370 uses Audinate’s Ultimo™
integrated circuit. The firmware in this
integrated circuit can be updated via the
Ethernet connection, helping to ensure
that its capabilities remain up to date.
Getting Started
What’s Included
Included in the shipping carton are a
Model 370 Intercom Beltpack and a printed
copy of this guide. As a device that is
Power-over-Ethernet (PoE) powered, no
external power source is provided. Should
a PoE midspan power injector be required
it must be purchased separately.
Connections
In this section signal interconnections
will be made using the two connectors
located on the bottom of the Model 370.
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
dual- or single-earpiece headset (stereo
or monaural) will be connected using a
cable-mounted 5-pin male XLR connector.
Ethernet Connection with PoE
A 100BASE-TX Ethernet connection that
supports Power-over-Ethernet (PoE) is
required for Model 370 operation. This one
connection will provide both the Ethernet
data interface and power for the Model
370’s circuitry. A 10BASE-T connection is
not sufficient and a 1000BASE-T (“GigE”)
connection is not supported unless it can
automatically “fall back” to 100BASE-TX
operation. The Model 370 supports Ether-
net switch power management, enumerat-
ing itself as a PoE class 1 device.
Issue 3, May 2017 Model 370 User Guide
Page 8 Studio Technologies, Inc.
The Ethernet connection is made by way
of a Neutrik etherCON protected RJ45
connector that is located on the bot-
tom panel of the Model 370. This allows
connection by way of a cable-mounted
etherCON connector or a standard RJ45
plug. The Model 370’s Ethernet interface
supports auto MDI/MDI-X so that a “cross-
over” or “reversing” cable should not be
required.
Ethernet Connection without PoE
As previously discussed in this guide,
the Model 370 was designed such that
the Ethernet connection will provide both
data and Power-over-Ethernet (PoE)
power. There may be situations where the
associated Ethernet switch does not pro-
vide PoE power. In such cases an external
PoE midspan power injector can be used.
If the selected midspan power injector is
802.3af-compatible it should function cor-
rectly. Midspan units are available from a
variety of sources, including many online
retailers.
Headset Connection
The Model 370 provides a 5-pin female
XLR connector that interfaces with the
microphone and headphone connections
of an intercom or broadcast-style headset.
Refer to Figure 2 for connection details.
The microphone input connections are
intended for use with unbalanced dynamic
microphones. Balanced microphones
should, in most cases, also function cor-
rectly if the signal – (low) is connected to
Model 370’s mic in –/shield connection.
No support is provided for microphones
that require low-voltage “eletret,” P12
phantom, or P48 phantom powering.
To allow users of stereo (dual-earpiece
or “double-muff”) headsets to hear a
monaural version of the two output chan-
nels does not require special wiring of the
5-pin male XLR mating connector. The
headset’s left phones channel should
always be wired to pin 4 and the right
phones channel to pin 5. Configuration
choices, discussed later in this guide, can
then be used to create the desired mon-
aural output. It’s important not to connect
together (short) pins 4 and 5 of the Model
370’s headset connector as damage to
the Model 370’s output circuitry could
result.
Monaural (single-earpiece or “single-
muff”) headsets should be wired such that
its headphone is wired only to pin 4; pin 5
should be remain unused. The configura-
tion switches, discussed later in this guide,
can be used to create a monaural output.
(Technically this can send audio to both
pins 4 and 5 of the Model 370’s headset
connector but the headset will only con-
nect to pin 4.)
It’s possible that some Beyerdynamic in-
terconnecting cable assemblies terminate
their 5-pin male XLR connector with their
earpiece’s left channel on pin 5 and right
channel on pin 4. This is opposite from
Figure 2. Headset connection pinout chart
Model 370 User Guide Issue 3, May 2017
Studio Technologies, Inc. Page 9
what the Model 370 requires. As such,
“flipping” pins 4 and 5 in the headset’s
5-pin male XLR connector may be required
so that the left and right channels from the
Model 370 match correctly.
Dante Configuration
For audio to pass to and from the Model
370 requires that several Dante-related
parameters be configured. These configu-
ration settings will be stored in non-volatile
memory within the Model 370’s circuitry.
Configuration will typically be done with
the Dante Controller software application
which is available for download free of
charge at www.audinate.com. Versions of
Dante Controller are available to support
Windows® and OS X® operating systems.
The Model 370 uses the Ultimo 2x2 chan-
nels (2-input/2-output) integrated circuit to
implement the Dante architecture.
The two Dante transmitter (Tx) channels
associated with the Model 370’s Dante
interface must be assigned to the desired
receiver channels. This achieves rout-
ing the Model 370’s two talk output audio
channels to the device (or devices) that will
be “listening” to them. Within Dante Con-
troller a “subscription” is the term used for
routing a transmitter flow (a group of out-
put 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, mul-
ticast, or a combination of the two. If the
Model 370’s transmitter channels need to
be routed to more than two flows it’s pos-
sible that an intermediary device, such as a
rack-mounted digital signal processor unit
with more available flows, can be used to
“repeat” the signals.
The two Dante receiver (Rx) channels as-
sociated with the Model 370’s audio inputs
also need to be routed to the desired Dante
transmitter channels. These two audio sig-
nals will be sent to the Model 370’s head-
phone outputs.
The Model 370 supports an audio sample
rate of 48 kHz with a limited selection of
pull-up/pull-down values available. In most
cases the default will be used and a pull-up
or pull-down rate will not be selected. The
Model 370 can serve as the clock master
for a Dante network but in most cases it will
be configured to “sync” to another device.
The Model 370 has a default Dante device
name of ST-M370 and a unique suffix. The
suffix identifies the specific Model 370 that
is being configured. The suffix’s actual al-
pha and/or numeric characters relate to the
MAC address of the unit’s Ultimo integrated
circuit. The two Dante transmitter (Tx)
channels have default names of Ch1 and
Ch2. The two Dante receiver (Rx) channels
have default names of Ch1 and Ch2. Using
Dante Controller the default device name
and channel names can
be revised as appropriate for the specific
application.
Model 370 Configuration
Five DIP switches are used to select the
mic preamplifier gain and how the user
controls on the Model 370 will function.
These configuration choices allow the
performance of the unit to be optimized for
specific applications and user preferences.
The switches are accessible from the back
of the unit’s enclosure, through a small
opening that is located under the top of the
belt clip. To access the switches requires
that the belt clip be rotated. Normally the
belt clip is secured to the back using one
Issue 3, May 2017 Model 370 User Guide
Page 10 Studio Technologies, Inc.
rivet (non-removable) and one machine
screw that has a thread pitch of 6-32. To
allow the belt clip to rotate, remove the
machine screw using a #1 Phillips-head
screwdriver. The belt clip should now be
able to be easily rotated in either direc-
tion. Save the screw so that it can be
re-installed once the desired configura-
tion choices have been made. Note that
the threaded fastener within the back of
the Model 370’s chassis has an internal
locking mechanism (a plastic bushing)
that prevents the belt clip’s 6-32 machine
screw from vibrating loose. So no addi-
tional method of thread locking, such as
a lock washer or chemical compound, is
necessary.
The five switches provide a nice set of
configuration choices. One allows the
gain of the microphone preamplifier to
be adjusted. Two of the switches are
used to select how the talk buttons func-
tion. And the last two switches select how
the input audio signals are routed to the
headphone outputs. The five switches are
connected to the Model 370’s logic circuit-
ry which responds to changes by way of
the application firmware; no audio passes
directly through the switches. Changes
made to any of the switches will immedi-
ately be reflected in the unit’s operation.
A power cycle is not required for con-
figuration changes to be recognized and
implemented.
Microphone Preamp Gain
Switch SW1 allows the gain of the micro-
phone preamplifier to be selected. When
SW1 is in its down (off) position 40 dB of
gain is selected. This will be appropriate
for most applications. (Technically this
gain is approximately equal to the gain
provided within an RTS® BP-325 analog
party-line beltpack.) Place SW1 to its up
(on) position to select the 46 dB gain set-
ting. This additional 6 dB of gain may be
helpful in some applications, such as with
headsets that have a low microphone out-
put level. The higher gain setting may also
be useful when the Model 370 is going to
be deployed at events where users are not
able to speak at normal levels, e.g., sport-
ing events such as golf tournaments.
The compressor active LED, visible on
the bottom of the Model 370 adjacent to
the headset connector, can act as a guide
when setting the preamp gain. During
normal talk operation the compressor
active LED should light intermittently. If it
rarely lights and the gain is set to 40 dB, it
might be a good idea to change to setting
to 46 dB. If the LED is lit fully during nor-
mal talking and the gain is set for 46 dB,
changing it to the 40 dB setting might be
warranted. There’s no “hard and fast” rule
about what gain setting is appropriate.
But unless otherwise indicated, 40 dB
is typically a good choice.
Talk Button Modes
On the Model 370’s top panel are two
pushbutton switches that allow the user
to control the on/off status of the headset
microphone audio that’s sent to the two
audio output (Dante transmitter) channels.
Configuration switches SW2 and SW3
allow the buttons’ operating modes to be
Figure 3. Microphone preamp gain
configuration switch
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