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Model 372A User Guide 

Issue 1, April 2019 

Studio Technologies, Inc. 

Page 15

MODEL 372A

INTERCOM BELTPACK

Push to Talk

When the button has been configured for the 

Push to Talk mode how it functions is pretty 

self-explanatory. Press and hold the button 

when headset microphone audio is to be 

sent out the Dante audio output (transmitter) 

channel. The button’s green LED will light to 

indicate that the output is active. The button 

will not be lit when the function is not active.

Latching

If the button has been configured for the 

Latching mode operation momentarily  

pressing (“tapping”) the button will cause  

the function to change states: off-to-on or  

on-to-off. Whenever the talk function is  

active the green LED will light. The button  

will not be lit when the function is not active.

Push to Talk/Tap to Latch

If the button has been configured for the 

Push to Talk/Tap to Latch mode operation 

is a bit different and certainly more flexible. 

Press and hold the button to activate the talk 

function. When released the talk function 

will turn off. Momentarily pressing (“tapping”) 

the button will cause the function to change 

states: off-to-on or on-to-off. Whenever the 

talk function is active the pushbutton will light 

green. The button will not be lit when the 

function is not active.

Sidetone Function

The Model 372A includes a sidetone func-

tion that sends microphone audio to the 

headphone output whenever the talk function 

is active. The quality of the sidetone audio 

should be excellent and will provide Model 

372A users with a confidence signal that they 

are actively talking to other intercom users. 

Sidetone audio will always be sent to both 

the left and right headphone output chan-

nels. This is because the function is trying to 

simulate what a user would hear if they didn’t 

have a headset covering both their ears.

An exception is if both Dante input channels 

are routed to only the left headphone output 

channel. In this case sidetone audio will only 

be sent to the left headphone output channel.
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 a physi-

cal button or control on the Model 372A unit. 

Also, the two headphone level controls on the 

top panel of the unit do not impact the side- 

tone level.
In most cases the exact sidetone level  

setting is not critical and typically users will 

not be concerned about revising it. But set-

ting the sidetone level to something reason-

able 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 users aren’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 

appropriate level.

Call Detection Display

A Model 372A function allows a call signal 

that’s present on either Dante receiver (input) 

channel to cause the pushbutton switch’s 

LED to light. Whenever a call signal is de-

tected the button’s orange LED will first flash 

and then light continually. Technically, a call 

signal is achieved by sending a 20 kHz audio 

tone on the desired Dante audio channel. 

This signal is summed (mixed) with normal 

talk audio. The Model 372A’s two audio input 

channels continually monitor the audio input 

for the presence of 20 kHz.
The detection circuitry will not confuse  

normal talk audio signals with a call signal. 

Summary of Contents for 372A

Page 1: ...ies Inc all rights reserved www studio tech com User Guide Issue 1 April 2019 This User Guide is applicable for serial numbers M372A 00151 and later with application rmware 1 1 and later 50691 0419 Is...

Page 2: ...This page intentionally left blank...

Page 3: ...uide Issue 1 April 2019 Studio Technologies Inc Page 3 MODEL 372A INTERCOM BELTPACK Table of Contents Revision History 4 Introduction 5 Getting Started 8 Operation 13 Technical Notes 17 Speci cations...

Page 4: ...Issue 1 April 2019 Model 372A User Guide Page 4 Studio Technologies Inc MODEL 372A INTERCOM BELTPACK Revision History Issue 1 April 2019 Initial release...

Page 5: ...ercom channel During the time that an event is taking place the listen function will serve a much more important role the talk function will rarely be utilized However the second listen channel will o...

Page 6: ...l 372A using the Dante audio over Ethernet media networking technology As a Dante compliant device the Model 372A s one audio output Dante transmitter channel and two audio input Dante receiver chan n...

Page 7: ...by way of an Ethernet net work connection Con gurable parameters include microphone power and preampli er gain headphone monitoring sidetone audio operation and talk button operation The microphone in...

Page 8: ...ow the CTIA AHJ con guration standard Ethernet Connection with PoE A 100BASE TX Ethernet connection that supports Power over Ethernet PoE is re quired for Model 372A operation This one connection will...

Page 9: ...ece s left and right connections opposite from what the Model 372A and other broadcast equipment require These cables may terminate the left earpiece to pin 5 of the 5 pin male XLR connector and the r...

Page 10: ...pplication the default device name and channel names can be revised as appropriate for the speci c application Model 372A Con guration Many of the Model 372A s operating param eters can be con gured t...

Page 11: ...that are present on the network will be rec ognized and display on the device list Use the Identify command to allow easy recogni tion of a speci c Model 372A unit Double clicking on a device name wil...

Page 12: ...e transmitter output channels can be assigned to the Model 372A s two Dante receiver input channels using the Dante Controller application How these two audio signals are routed to the Model 372A s he...

Page 13: ...el 372A operation can commence An Ethernet connection with Power over Ethernet PoE capability should have been made A headset terminated with a cable mounted 5 pin male XLR connector may be plugged in...

Page 14: ...intermittently whenever a user is talking at a normal voice level into the connected microphone But if the COMP LED lights solid while a user is talking at a normal voice level this will typically ind...

Page 15: ...his is because the function is trying to simulate what a user would hear if they didn t have a headset covering both their ears An exception is if both Dante input channels are routed to only the left...

Page 16: ...speci c Model 372A When the Identify command is selected it will send a message to a single Model 372A unit On that speci c unit the pushbut ton switch s orange LED will ash rapidly In addition the SY...

Page 17: ...om for details on optimiz ing networks for Dante applications Also be certain to disable Energy Ef cient Ethernet Technical Notes IP Address Assignment By default the Model 372A s Ethernet inter face...

Page 18: ...72A bin Studio Technologies will supply the applica tion rmware le inside a zip archive le While the application rmware le inside of the zip le will adhere to the naming con vention required by the Mo...

Page 19: ...circuit from Audinate The Dante Controller software application can be used to deter mine the version of the rmware embedded software that resides in the Ultimo chip name of the zip le itself will in...

Page 20: ...has traditionally been used to install the Ultimo rmware The Dante Controller software ap plication also includes an automated method of updating Ultimo rmware Both applica tions are available free of...

Page 21: ...at minimum gain Dynamic Range 91 dB of dynamic range Compressor Application applies to Dante transmitter output channel and sidetone audio Threshold 2 dB above nominal level 19 dBFS Slope 2 1 Status L...

Page 22: ...ndix A STcontroller default Model 372A con guration values Microphone Input Electret Power Off Microphone Input Gain 36 dB Headphone Output Channel 1 Input Routes to Left Headphone Output Channel 2 In...

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