Manual

Issue 2, March 2020 Model 381 User Guide
Page 14 Studio Technologies, Inc.
MODEL 381
ON-AIR BELTPACK
can be appropriate when the most accu-
rate representation of the microphone input
signal is desired. This would allow maxi-
mum “downstream” control of a signal that
is to be used for “on-air” or other primary
purposes. Any processing of audio coming
from the main output channel would need
to be performed in equipment that’s “post”
(after) the Model 381 in the audio chain.
The downside of selecting pre-compressor
is an increased risk of signal overload.
Post-Compressor
When selected for Post-Compressor the
audio source for the Dante main output
channel will be the output of the dynamics
control (compressor) circuitry. This can help
prevent excessive signal levels from being
sent out the main output channel and on to
the next audio device in the signal “chain.”
With a threshold of just above the nominal
digital output level and a “gentle” compres-
sion ratio of just 2 to 1, in most cases the
impact of the compressor on voice audio
signals will be minimal while helping to
prevent audio overloads.
Operation
At this point everything should be ready
such that Model 381 operation can com-
mence. An Ethernet connection with Power-
over-Ethernet (PoE) capability should have
been made. A microphone and headphones
or an earbud should have been connected.
Alternately, a broadcast-style headset may
be utilized.
The Model 381’s Dante configuration set-
tings should have been selected using
the Dante Controller software application.
In this way the unit’s two audio output chan-
nels (Dante transmitter channels) and two
audio input channels (Dante receiver chan-
nels) should have been routed (subscribed)
to the Dante receiver and Dante transmitter
channels on associated equipment. The
Model 381’s operating configuration should
have been established using the STcon-
troller application. This will ensure that
the unit will meet the needs of the specific
application.
Initial Operation
The Model 381 will start to function as soon
as a Power-over-Ethernet (PoE) power
source is connected. However, it may take
20 to 30 seconds for full operation to com-
mence. Upon initial power up the three
status LEDs located on the bottom panel,
below the etherCON RJ45 jack, will begin to
light as the network and Dante connections
are established. The COMP LED, adjacent
to the microphone input connector, may or
may not flash momentarily. The P48 LED,
also located adjacent to the microphone
input connector, will flash once to indicate
that it is functioning. The green and orange
LED indicators within the talkback pushbut-
ton switch will each light once to indicate
that the main operating firmware (embed-
ded software) has started functioning. Once
the power-up sequence has completed and
the Dante connection has been established
full operation will begin. The unit’s various
LEDs will become operational, displaying
the status of their designated functions.
How to Identify a Specific
Model 381
Functions within the Dante Controller and
STcontroller software applications allow
a specific Model 381 unit to be identified.
Each application provides an “eyeball” icon
that when selected (“clicked”) will activate
the Identify function. When Identify is se-
lected it will send a command to the des-
ignated Model 381 unit. On that unit the
orange LED associated with the talkback