User Guide
Model 374A User Guide Issue 4, February 2021
Studio Technologies, Inc. Page 7
MODEL 374A
INTERCOM BELTPACK
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. Call signals pres-
ent on the four audio input (Dante receiver)
channels can be detected and displayed.
To optimize for specific applications, a
configuration choice allows the way in
which the Model 374A will display Call
when 20 kHz has been detected. Push-
button 4, on the Model 374A’s top panel,
can be configured to serve as a call button.
This allows a call signal to be generated for
talk channels 1, 2, and 3.
Configuration Flexibility
A highlight of the Model 374A is its ability
to be easily configured to meet the needs
of specific users and applications. All
configuration choices are made using
the STcontroller software application that
communicates with the Model 374A by
way of an Ethernet network connection.
Configurable parameters include micro-
phone power and preamplifier gain, side-
tone audio operation, talk button operation,
call indication, and headphone monitoring.
The microphone input can be selected
for compatibility with dynamic or electret
(DC-powered) microphones. The gain of
the microphone preamplifier can be select-
ed from among four choices. These allow
compatibility with a variety of microphones
that are part of broadcast and intercom
headsets.
A unique Model 374A feature is the ability
to individually configure the way in which
the four talk pushbutton switches function;
four choices are available. For standard
intercom beltpack operation either Push
to Talk or Push to Talk/Tap to Latch opera-
tion can be selected. For situations where
only monitoring of an intercom channel
is desired a Talk Disabled mode is avail-
able. And for advanced monitoring-only
situations the Talk Disabled/Phones Tap to
Latch mode can be selected such that a
button will serve in an audio on/off role.
Four audio channels arrive via Dante and
are destined for the 2-channel headphone
output. Each input source can be inde-
pendently routed to the left headphone
channel, right headphone channel, or both
the left and right headphone channels.
This flexibility allows a variety of listening
environments to be created, including
stereo, single-channel monaural, and
dual-channel monaural.
Ethernet Data and PoE
The Model 374A 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 receptacle.
While compatible with standard RJ45
plugs, etherCON allows a ruggedized and
locking interconnection for harsh or high-
reliability environments. An LED displays
the status of the network connection.
The Model 374A’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 associ-
ated data network. To support PoE power
management, the Model 374A’s PoE
interface reports to the power sourcing
equipment (PSE) that it’s a class 1 (very
low power) device.