Manual

Issue 1, January 2020 Model 348 User Guide
Page 26 Studio Technologies, Inc.
MODEL 348
INTERCOM STATION
This will prove useful when adjusting the en-
coders to achieve the desired level settings.
If an encoder is placed in its mute state by
pressing the encoder’s knob then the knob
cap will light purple and the level display
will not occur. Also, when mute is active any
changes to an encoder’s position will not be
recognized. To clarify, if an encoder knob is lit
purple then any rotations of the knob will not
be recognized.
Headset Operation
A headset with either a 5-pin XLR plug (male)
or a 4-pin 3.5 mm TRRS plug can be con-
nected with one of the headset connectors on
the Model 348’s back panel. The connectors
are labeled Headset A and Headset B.
Headset Microphone
On Headset A and Headset B the electrical
connections for the microphone input and
two headphone output channels are inter
-
nally wired together (“multed” or connected in
parallel). As such, only one headset should be
connected at a time. If power for an electret
microphone that’s part of the connected head-
set is required it should have been selected
in the ST
controller application. The red LED,
label MIC PWR and located adjacent to the
5-pin XLR connector, will be lit to indicate that
low-voltage DC has been applied to the mi-
crophone connections on both headset con-
nectors A and B.
Headset Headphone Outputs
Settings within STcontroller select which of
the eight Dante input channels are routed,
by way of rotary encoders 1 through 8, to the
headset’s headphone left and right output
channels. The rotary encoder labeled HEAD-
SET on the front panel adjusts the level of
both headphone output channels. As previ-
ously discussed, the headset’s headphone
output can be muted by pressing the headset
encoder knob. The knob will light purple to
indicate that both headphone output chan-
nels are muted. If the signal present function
is enabled in STcontroller the encoder’s knob,
when it is not muted, will light green, yellow,
or red to indicate the overall headset head-
phone output channel level. (It will follow a
monoaural version of the left and right headset
headphone outputs.) It’s acceptable that the
knob lights yellow on occasion but lighting red
would indicate that either or both headphone
output channels are at risk for signal clipping
(distortion due to insufficient audio headroom
to handle the signal level). This would indicate
that distortion may be present due to insuffi-
cient audio headroom.
Sidetone
A sidetone function is available for assist-
ing headset users in hearing audio from the
currently active microphone. The sidetone
function will be active whenever one or more
buttons configured for
Talk,
Talk with 18 kHz,
or IFB functions are active. Using STcon-
troller the sidetone level is configured from
among five values as well as mute. By default,
sidetone is enabled at a configured level of
medium. Once configured in STcontroller the
sidetone level is fixed and cannot be changed
by the user. This is implemented in this man-
ner such that a user will always be provided
with a reference level as to how much micro-
phone audio signal is being sent out the Dante
output channels.
Headset Headphone Output Dim
Following an STcontroller configuration set-
ting the headset’s headphone output level can
reduce in level (“dim” or be attenuated) when
one or more of the eight button functions are
active. Enabling the headphone dim configu-
ration is provided for the rare situation where
the headset’s headphone output channels are
being used as line-level analog outputs. This
could be useful, for example, when connecting