User Guide

Issue 4, February 2021 Model 374A User Guide
Page 12 Studio Technologies, Inc.
MODEL 374A
INTERCOM BELTPACK
the left only, right only, or both left and right
headphone channels.
When using a stereo headset sending all
inputs to both channels is often referred to
as a dual-channel mono output. If a monau-
ral (“single muff”) headset is used the Left
configuration option allows the four input
channels to be combined to monaural so
that the listener can simultaneously hear
both sources.
Sidetone – Level
Choices are Off, Low, Medium Low,
Medium, Medium High, and High.
The Model 374A includes a sidetone func-
tion that allows microphone audio coming
from the microphone preamplifier to be
sent to the both channels of the headphone
output. This serves as a user confirmation
that they are actively sending audio to one
or more of the talk output channels. Sidet-
one audio will only be routed to the head-
phone output when at least one of the talk
channels is active. The level of the sidetone
audio can be selected from among five val-
ues. The correct value is simply the one that
makes the user most comfortable. Sidetone
audio can also be disabled by selecting Off.
Selecting Off would be useful only in special
applications such as during troubleshooting
or where user talk audio is being returned
as part of their listen audio signals. The
four rotary level controls will not impact the
sidetone level.
Button Operation
Choices are Push to Talk, Push to Talk/Tap to
Latch, Talk Disabled, Talk Disabled/Phones
Tap to Latch, and Call (button 4 only).
This configuration section allows indepen-
dent selection of how the four buttons will
function. When the Push to Talk mode is
selected the operation is self-explanatory.
Only when a button is pressed and held will
talk audio be sent out its associated Dante
transmitter channel.
When the Push to Talk/Tap to Latch mode
is selected a “hybrid” function of sorts is
enabled. Pressing and holding the button
will enable audio to be sent out its associ-
ated Dante transmitter channel. When the
button is released audio will stop being
sent out its associated transmitter channel.
Tapping (momentarily pressing) the button
will cause the function to “latch” into the talk
active mode. Tapping the button again will
cause the function to “unlatch” and talk will
no longer be active.
Many applications are best served when the
buttons are configured in the Push to Talk
mode. This ensures that a channel can’t
accidentally be left in its active mode. But
there are certainly valid situations when the
Push to Talk/Tap to Latch mode setting will
prove to be very useful.
When the Talk Disabled mode is selected
microphone audio will never be sent out the
associated Dante transmitter channel. This
can be useful when the audio input associ-
ated with this channel is going to be moni-
tored but talk audio is not allowed to “join”
this specific intercom channel.
When the Talk Disabled/Phones Tap to Latch
mode is selected the associated button will
not impact talk audio but will instead con-
trol the on/off state of the audio being sent
to the headphone output. In this mode talk
audio will never be sent out the associated
Dante transmitter channel. This is an inter-
esting mode, allowing one or more Model
374A audio channels to serve in a “monitor
mixer” function. The button will allow quick
on/off control while the rotary level control
can remain in its desired position.