Issue 1, September 2016
Model 380 User Guide
Page 16
Studio Technologies, Inc.
gain setting should be reduced. Converse-
ly, if the COMP LED almost never lights
when normal talking is taking place, it’s
possible that changing the gain to a high-
er value would be beneficial. Note that due
to the design of the circuitry the compres-
sor active LED will function whether or not
any of the four talk channels are active.
Talkback Button
One pushbutton switch is used to select
the status of the two Dante audio output
channels and the microphone output con-
nector. Labeled TALKBACK, the button
really provides both an output mute and a
talkback enable function. When “talkback”
is active audio is no longer sent out the
Dante main output channel but instead
is routed to the Dante talkback output
channel. In this way the “on-air” channel
is muted and the talkback channel is ac-
tive. And whenever the Dante main output
channel is muted the microphone output,
provided on the 3-pin XLR connector, will
also be muted. How the talkback button
will specifically function will depend on the
configuration of the Model 380.
Momentary
When the talkback button has been
configured for momentary operation
how it functions is pretty self-explanatory.
Press and hold the button to enable the
talkback function. When talkback is en-
abled microphone audio will be sent out
the Dante talkback output channel; the
Dante main output channel and the micro-
phone output will both be muted. When
the talkback button is pressed the button’s
orange LED will light. When the talkback
button is not pressed the button’s green
LED will be lit.
Latching
If the talkback button has been configured
for the latching mode its operation is a bit
different. Momentarily pressing (“tapping”)
the button will cause the talkback func-
tion to change states: off-to-on or on-to-off.
Whenever microphone audio is being sent
out the Dante main output channel and the
microphone output is active the button’s
green LED will be lit. The button’s LED will
light orange when the talkback function is
enabled and microphone audio is being
sent out the Dante talkback output channel
while both the Dante main output channel
and microphone output are muted.
Sidetone Function
The Model 380 includes a sidetone func-
tion that sends microphone audio to the
headphone output whenever the micro-
phone audio is being sent to the Dante
main output channel and the microphone
output. Sidetone audio will never be pro-
vided when the talkback function is active.
Sidetone audio quality should be excellent
and will provide the Model 380 user with
a confidence signal that they are active or
“on-air.” A configuration choice allows the
sidetone function to be enabled or disabled
as desired for the application. In a nutshell,
if a mix-minus cue signal is being provided
to the user by way of the audio inputs then
sidetone will typically want to be enabled.
Whether sidetone audio will be sent to the
left and right headphone output channels
or only the left headphone output chan-
nel will depend on the configuration of the
headphone output. As expected, when the
Model 380 is configured for dual-channel
sidetone audio will be sent to the left and
right headphone output channels. When
configured for monaural sidetone audio will
