User Guide

Model 374A User Guide Issue 4, February 2021
Studio Technologies, Inc. Page 5
MODEL 374A
INTERCOM BELTPACK
Introduction
The Model 374A Intercom Beltpack
begins with the features offered by tradi-
tional party-line intercom user devices and
adds a range of new capabilities along
with the advanced performance and flex-
ibility that Dante® audio-over-Ethernet
provides. With four independent talk and
listen channels the Model 374A bridges
the gap between typical single- and dual-
channel party-line devices and permanent-
ly installed multi-channel intercom panels.
Imagine the possibilities—four channels
of high-quality party-line intercom in a
compact, user-worn package.
Over a standard IP network, multiple
Model 374A units can be used in party-line
(PL) intercom applications with help from
an external Dante-enabled audio matrix
such as the Studio Technologies’ Model
5421 or Model 5422A Dante Intercom
Audio Engine units. Or, units can be used
“point-to-point” or interfaced with Dante-
compatible matrix intercom systems.
Only a single Power-over-Ethernet (PoE)
connection is required for operation. Key
user features can be easily configured us-
ing the STcontroller software application.
Configurable parameters include electret
microphone powering, microphone pre-
amplifier gain, talk button operation, call
receive indication, and headphone channel
assignment. User features include inte-
grated sidetone, remote mic kill (“talk off”),
call receive and send, and audio monitor-
only modes. The wide range of capabilities,
along with the excellent audio quality pro-
vided by the digital audio signal path, offers
a unique and powerful user experience.
Set up and configuration of the Model 374A
is simple. An etherCON® RJ45 receptacle
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
or electret (DC-powered) microphone
interfaces with the unit using a 5-pin XLR
connector.
The STcontroller software application is
used to select the unit’s operating param-
eters. Four talk pushbutton switches can
be configured for optimal operation. Four
push-in/push-out (“pop out”) rotary con-
trols make it easy to set and maintain the
desired headphone output level. The Model
374A’s enclosure is made from an alumi-
num alloy which offers both light weight
and ruggedness. A stainless steel “belt
clip,” located on the back of the unit, allows
direct attachment to a user’s clothing.
Figure 1. Model 374A Intercom Beltpack top and bottom views