User Guide

Issue 1, April 2019 Model 373A User Guide
Page 14 Studio Technologies, Inc.
MODEL 373A
INTERCOM BELTPACK
connected microphone. But if the COMP LED
lights solid while a user is talking at a normal
voice level this will typically indicate that the
mic preamp gain setting should be reduced.
Conversely, if the COMP LED almost never
lights when normal talking is taking place,
it’s possible that changing the mic preamp
gain to the higher setting would be beneficial.
Note that due to the design of the circuitry the
compressor active LED will function whether
or not the talk channel is active.
Headphone Output
Two rotary potentiometers (“pots”), located on
the Model 373A’s top panel, allow individual
adjustment of the level of the two audio input
signals as they are sent to the 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 maxi-
mum 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 373A’s processor which then
adjusts the signal level within the digital do-
main. When a pot is in its fully counterclock-
wise position the associated audio signal is
fully muted. The on/off status of the talk chan-
nel does not impact the headphone output.
Button Operation
A pushbutton switch is associated with the
Model 373A’s talk channel. How the switch
functions will depend on the configuration
of the unit.
Push to Talk
When the 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 Dante audio output (transmitter) chan-
nel. The button’s green LED will light to indi-
cate that the output is active. The button will
not be lit when the function is not active.
Latching
If the button has been configured for the
Latching mode operation momentarily press-
ing (“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.
Push to Talk/Tap to Latch
If the button has been configured for the Push
to Talk/Tap to Latch mode operation is a bit
different and certainly more flexible. Press
and hold the button to activate the talk func-
tion. When released the talk function will turn
off. Momentarily pressing (“tapping”) the but-
ton will cause the function to change states:
off-to-on or on-to-off. Whenever the talk func-
tion is active the pushbutton will light green.
The button will not be lit when the function is
not active.
Sidetone Function
The Model 373A includes a sidetone func-
tion that sends microphone audio to the
headphone output whenever the talk function
is active. The quality of the sidetone audio
should be excellent and will provide Model
373A users with a confidence signal that they
are actively talking to other intercom users.
Sidetone audio will always be sent to both
the left and right headphone output channels.
This is because the function is trying to simu-
late what a user would hear if they didn’t have
a headset covering both their ears.