User Guide

Model 374A User Guide Issue 4, February 2021
Studio Technologies, Inc. Page 9
MODEL 374A
INTERCOM BELTPACK
connection. No support is provided for
microphones that require P12 or P48
phantom power.
To allow users of stereo (dual-earpiece or
“double muff”) headsets to hear a monau-
ral version of the two headphone output
channels does not require special wiring of
the 5-pin male XLR mating connector. The
headset’s left headphone channel should
always be wired to pin 4 and the right
headphone channel to pin 5. Configuration
choices, discussed later in this guide, can
then be used to create the desired monaural
output. It’s important not to connect togeth-
er (short) pins 4 and 5 of the Model 374A’s
headset connector as damage to the Model
374A’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. Configuration
choices, discussed later in this guide, can
be used to create a monaural output.
It’s possible that some Beyerdynamic
headset interconnecting cable assemblies
terminate the earpiece’s left and right con-
nections opposite from what the Model
374A and other broadcast equipment re-
quire. These cables may terminate the left
earpiece to pin 5 of the XLR connector and
the right earpiece to pin 4. If this condition
is present it will require reversing or “flip-
ping” the two wires in a headset’s 5-pin
male XLR connector such that the left
earpiece connects to pin 4 and the right
earpiece to pin 5.
Dante Configuration
For audio to pass to and from the Model
374A requires that several Dante-related
parameters be configured. These configu-
ration settings will be stored in non-volatile
memory within the Model 374A’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 Win-
dows® and OS X® operating systems.
The Model 374A uses the Ultimo 4-input/
4-output integrated circuit to implement
the Dante architecture.
The four Dante transmitter (Tx) channels
associated with the Model 374A’s Dante
interface must be assigned to the desired
receiver (Rx) channels. This achieves
routing the Model 374A’s four talk output
audio channels to the device (or devices)
that will be “listening” to them. Within
Dante Controller a “subscription” is the
term used for routing a transmitter flow
(a group of 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, mul-
ticast, or a combination of the two. If the
Model 374A’s transmitter channels need
to be routed using more than two flows it’s
possible that an intermediary device, such
as the Studio Technologies’ Model 5422
Dante Intercom Audio Engine, can be
used to “repeat” the signals.
Figure 2. Headset connection pinout chart