Manual

Issue 3, August 2019 Model 374A User Guide
Page 14 Studio Technologies, Inc.
MODEL 374A
INTERCOM BELTPACK
has started. Once the entire sequence has
completed and the Dante connection has
been established full operation will begin.
Ethernet and Dante Status
LEDs
Three status LEDs are located below the
etherCON RJ45 receptacle on the Model
374A’s bottom panel. The LINK ACT LED
will light green whenever an active con-
nection to a 100 Mb/s Ethernet network
has been established. It will flash in re-
sponse to Ethernet data packet activity.
The SYS and SYNC LEDs display the
operating status of the Dante interface and
associated network. The SYS LED will light
red upon Model 374A power up to indi-
cate that the Dante interface is not ready.
After a short interval it will light green to
indicate that it is ready to pass data with
another Dante device. The SYNC LED
will light red when the Model 374A is not
synchronized with a Dante network. It will
light solid green when the Model 374A is
synchronized with a Dante network and an
external clock source (timing reference)
is being received. It will slowly flash green
when this specific Model 374A is serving
as the clock master for the network. It’s
possible that up to 30 seconds may be
required for the SYNC LED to reach its
final state.
Compressor Active LED
A yellow LED indicator is located on the
bottom panel adjacent to the headset con-
nector. Labeled COMP, the LED displays
the status of the microphone audio com-
pressor function. It will light whenever the
input level from the microphone, along
with the configured preamplifier gain, is
such that the dynamic range of the talk
signal is being controlled. It’s perfectly
acceptable for this LED to light intermit-
tently whenever a user is talking at a
normal voice level into the associated
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 ac-
tive LED will function whether or not any
of the four talk channels are active.
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 distor-
tion. Audio signals do not pass directly
through the level pots. The position of the
pots is recognized by the Model 374A’s
processor which then adjusts the signal
level within the digital domain. When a
pot is in its fully counterclockwise posi-
tion the associated audio signal is fully
muted. In most cases the on/off status of