Manual

Model 381 User Guide Issue 2, March 2020
Studio Technologies, Inc. Page 11
MODEL 381
ON-AIR BELTPACK
Microphone Input – Gain
Choices are 36 dB, 42 dB, 48 dB, 54 dB,
and 60 dB.
The gain of the Model 381’s microphone
preamplifier can be selected from among
five choices. The compressor active LED,
orange in color and visible on the bottom of
the Model 381’s enclosure adjacent to the
microphone input connector, can act as a
guide when setting the preamp gain. When
a voice signal at a normal level is present
on the microphone input the compressor
active LED should light intermittently. If, for
example, it rarely lights and the gain is set
to 42 dB, it might be a good idea to change
the setting to 48 dB. If the LED is lit fully
while speaking at a normal level into the
microphone and the gain is set for 54 dB
or 60 dB, changing the gain to one of the
lower values might be warranted. There’s
no “hard and fast” rule about which gain
setting is appropriate. But unless otherwise
indicated, 42 dB is typically a good initial
choice.
Headphone Output – Routing
Choices are Dual-Channel Stereo, Dual-
Channel Mono, and Single-Channel Mono.
STcontroller allows selection from among
three headphone output modes. Each mode
is distinct and careful selection will help op-
timize the Model 381’s operation for a range
of applications.
Dual-Channel Stereo
The Dual-Channel Stereo mode is provided
for on-air applications where two indepen-
dent audio sources need to be routed to the
two headphone output channels. Dante
audio input channel 1 will be routed to the
left headphone output channel and Dante
audio input channel 2 will be routed to the
right headphone output channel. Note that
in this mode the sidetone audio signal will
be routed to both the left and right head-
phone output channels.
Dual-Channel Mono
The Dual-Channel Mono mode can be use-
ful in applications where the same audio
signals need to be provided to the user on
both the left and right headphone output
channels. In this mode Dante audio inputs
1 and 2 are combined (mixed together or
“summed”) and routed to both the left and
right headphone output channels. Note that
in this mode the sidetone audio signal will
be routed to both the left and right head-
phone output channels.
Single-Channel Mono
The Single-Channel Mono mode is spe-
cifically provided for applications where a
2-conductor ¼-inch plug is being used with
the connected headphones, headset, or
a broadcast-style earpiece. In this mode
Dante audio inputs 1 and 2 are combined to
monaural and routed to only the left channel
of the headphone output; no audio signal
is routed to the right channel of the head-
phone output. Note that in this mode the
sidetone audio signal will be routed to only
the left headphone output channel.
Headphone Output – Controls (A/B)
Choices are Ch 1 Level / Ch 2 Level, Ch 1
& 2 Level / Balance, and Ch 1 & 2 Level /
Sidetone Level.
Three configuration choices in STcontroller
allow selection of the manner in which the
two rotary controls (“pots”), labeled A and B,
will function.
Ch 1 Level / Ch 2 Level
This mode is provided for on-air applica-
tions where independent control of the
channel 1 and channel 2 input signals is
required. The control on the left, labeled
A, will allow adjustment of input channel 1.