User Guide

ManualsBrandsStudio Technologies ManualsIntercom BeltpackSTUDIO TECHNOLOGIES 374A Intercom Beltpack

Issue 4, February 2021 Model 374A User Guide

Page 16 Studio Technologies, Inc.

MODEL 374A

INTERCOM BELTPACK

function. The button’s orange LED will light

whenever audio is being sent to the head-

phone output. The headphone output level

will continue to follow the setting of the as-

sociated rotary level control.

Call (Button 4 Only)

When button 4 is conﬁgured for the Call

mode it will allow call signals to be gener-

ated whenever talk channels 1, 2, and/or 3

are active. The button functions in a push-

to-call manner and will light orange when-

ever it is pressed and held. No microphone

audio will be routed to audio output 4. But-

ton 4 will never light in response to a call

signal being present on audio input 4. The

headphone output level will continue to

follow the setting of the rotary level control

associated with audio input 4.

Sidetone Function

The Model 374A includes a sidetone func-

tion that sends microphone audio to both

the left and right headphone output chan-

nels whenever one or more of the talk

buttons are active. The quality of the side-

tone audio should be excellent and will pro-

vide Model 374A users with a conﬁdence

signal that they are actively talking to other

intercom users. Sidetone audio will always

be sent to both headphone channels and is

not a conﬁgurable choice. This is because

the function is trying to simulate what a

user would hear if they didn’t have a head-

set covering their ears. It is not intended

to indicate to the user which Dante audio

output (transmitter) channel or channels

are actively sending audio.

The exact sidetone level is conﬁgured from

among ﬁve values within the STcontroller

application. There is also a selection choice

for turning off sidetone. There is no means

of adjusting the sidetone level using any

physical buttons or controls on the Model

374A unit. Also, the four headphone level

controls on the top panel of the unit do not

impact the sidetone level.

In most cases the exact sidetone level set-

ting is not critical and typical users will not

be concerned about revising it to a spe-

ciﬁc value. But setting the sidetone level to

something reasonable is important. Setting

the level too low will encourage users to

speak too loudly; setting it too high and

users will be tempted to speak hesitantly.

And while the user isn’t provided with a

sidetone level control or other adjustment

means, should the need arise STcontroller

allows rapid adjustment of the sidetone

level. In most cases the default sidetone

level, Medium, should provide an appropri-

ate level.

Call Function

General

The Model 374A includes a call function

that allows users, and users of compatible

equipment, to signal each other. A call

receive function is provided as part of each

of the Model 374A’s four channels. Any

combination of the four can have their

call function active at any one time. Techni-

cally, a call signal is achieved by sending a

nominal 20 kHz audio tone on the desired

audio output channel. This signal, normally

a sine- or square-wave, is summed (mixed)

with normal talk audio. The Model 374A’s

four audio input channels are always moni-

toring for the presence of 20 kHz. A call

signal is recognized when a continuous

20 kHz tone is present on the audio input

for that channel.

Note that any Model 374A channel that has

been conﬁgured to Talk Disabled/Phones

Tap to Latch mode will not respond to the