User Guide

Model 374A User Guide Issue 4, February 2021
Studio Technologies, Inc. Page 15
MODEL 374A
INTERCOM BELTPACK
Headphone Output
Four rotary potentiometers (“pots”),
located on the Model 374A’s top panel,
allow individual adjustment of the level of
the four audio input signals as they are
sent to the 2-channel headphone output.
Depending on the configuration of the
unit, each audio input can be sent to the
left channel, the right channel, or both the
left and right channels of the headphone
output. The pots are “push-in/push-out”
type which allow their associated knobs
to be in their “out” position to be adjusted
and then moved to their “in” position when
protection from an unwanted change is
desired.
Users should find the headphone output
audio quality to be excellent, with high
maximum output level and low distortion.
Audio signals do not pass directly through
the level pots. The position of the pots is
recognized by the Model 374A’s proces-
sor which then adjusts the signal level
within the digital domain. When a pot is
in its fully counterclockwise position the
associated audio signal is fully muted. In
most cases the on/off status of the four
talk channels does not impact the head-
phone output. However, one button con-
figuration setting (Talk Disabled/Phone Tap
to Latch) assigns the associated button to
function as a channel listen audio on/off
selector.
Button Operation
Four pushbutton switches are associated
with the Model 374A’s four channels. How
they function will depend on the configura-
tion of the unit. Each button can be config-
ured independently.
Push to Talk
When a button has been configured for
the Push to Talk mode how it functions is
pretty self-explanatory. Press and hold the
button when headset microphone audio is
to be sent out the associated Dante audio
output (transmitter) channel. The button’s
green LED will light to indicate that the
output is active. The button will not be lit
when the function is not active.
Push to Talk/Tap to Latch
If a button has been configured for the
Push to Talk/Tap to Latch mode operation
is a bit different and certainly more flex-
ible. Press and hold the button to activate
the talk function. When released the talk
function will turn off. Momentarily pressing
(“tapping”) the button will cause the func-
tion to change states; off-to-on or on-to-
off. Whenever the talk function is active the
green LED will light. The button will not be
lit when the function is not active.
Talk Disabled
A button that is configured to the Talk
Disabled mode will never allow talk audio
to be sent to the associated Dante audio
output channel. But to provide “feedback”
that the button has been pressed the
button’s green LED will flash rapidly three
times. This says, in effect, “Yes, I recog-
nize that you pressed the button but I’m
not going to do anything in response!”
Talk Disabled/Phones Tap to Latch
In the Talk Disabled/Phones Tap to Latch
mode the button will never allow talk
audio to be sent to the associated Dante
audio output channel. Instead the button
will operate in a tap to enable/tap to dis-
able (alternate action or “toggle”) manner
and provide an audio channel listen on/off