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Last update: November 23, 2021

Audio Profile

An Audio profile has an in and output section. available properties, options and ranges are dependant on the device model. Devices can have one or multiple audio profiles. for example a MCX which has 2 profiles to quickly change between 2 input sources.


Input Source

One of the available inputs or test tones can be selected. the options available depend on the device model.

  • Disabled
  • Headset
  • Front Mic
  • Line In
  • 375 Hz
  • 1 kHz
  • 1,2 kHz
  • 2,5 kHz

Input Gain


The gain of the audio input can be set. This is one of the most important settings. As setting the gain to high will distort the audio. Or setting the gain to low will cause a low signal to noise ratio. Make sure that speaking clear in the microphone will give a signal around the 0db mark.

Finding the Right Gain

Setting the right input gain and compression is important in order to prevent distortion, clipping or high signal-to-noise ratios.

  • Select the right input source vu
  • Turn off compressor and gate
  • Speak into the microphone with a proper volume and from a close enough distance
  • Raise or lower the gain so that the VU meter is around the wite line; 0dB
  • Increasing and lowering the volume of speech should keep the VU meter in the orange zone; -12dB through 6dB
  • If the dynamic vocal range is too high, the compressor can be enabled
  • To cut off background noise the gate can be set. Make sure that the gate is not triggered when speech is at a low level

Input Compressor

The compressor reduces the dynamic range off the input signal by reducing the louder parts of the signal. Making it less likely to be distorted. when enabled the release time of the compressor can be set.

  • Off
  • Fast decay = 300ms
  • Medium decay = 1,2s
  • Slow decay = 8s

Input Gate Threshold

The gate cuts of audio when below the set threshold. This is very use-full to keep the intercom system quiet and calm. A correctly set gate will only "open" the microphone when a user is talking. It will turn the mic off when the user stops talking.

  • Off
  • -50dB
  • -45dB
  • -40dB
  • -35dB
  • -30dB
  • -25dB

Input Gate Hold

The gate releases as soon as the audio is above the set threshold. the release time can be set with the gate hold. together with a correct set threshold the gate will nearly not be heard. this option is only available when the gate threshold is not OFF

  • Fast 250ms
  • Medium 1s
  • Long 2,7s
  • Extra Long 4s

How to Set a Gate

  • set the threshold to Off
  • set the correct input gain
  • set the gate hold to fast
  • set gate threshold so that background noise is just cut of.
  • set the gate hold to a comfortable time

Headset Bias Voltage

The bias voltage is a small voltage of 2.5V that can be switched on to power an electret microphone on a headset.

  • Off - bias voltage is NOT applied
  • On - bias voltage applied
  • Auto - the bias voltage is only applied when a talk is enabled

Mic Power

The Mic power is a phantom power of 10V that can be switched on to power an condenser microphone on a front-panel microphone input.

  • Off - phantom power is NOT applied
  • On - phantom power is applied
  • Auto - the phantom power is only applied when a talk is enabled


Side Tone

the side tone is the amount of the own input fed back into own outputs. the side tone is never send to front panel speakers to prevent feedback The side tone is used as confidence feedback A user can hear its own voice in the headset and knows that a channel talk is enabled.

  • Mute
  • -24dB to 0dB

Speaker Dim

Speaker Dim will attenuate the output of the speaker with the set level when a talk is active on this device. This is use-full to reduce the audio from the speaker echoing back into the input. this option is only available on devices with a internal speaker

  • Mute
  • -24dB to 0dB

Speaker Level

Sets the level of the speaker output. this option is only available on devices with a internal speaker

  • Mute
  • -48dB to 0dB

Headset Level

Sets the level of the headset output.

  • Mute
  • -48dB to 0dB

Line Out Level

Sets the level audio from the main user send to the line output.

Line out mix

the Line can contain a mix of the main user and the Line In/Out assigned group.

  • Mute
  • -48dB to 0dB

Main Level

The main level acts as a master for all outputs. it allows to quickly lower or raise all the levels simultaneously.

  • Mute
  • -36dB to 12dB


The limiter will Limit the output to the set amount

  • OFF (0dB)
  • -24dB to -6dB

Written by: Henk-Jan Blok, Timo Toups