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Vista M12/M22: How to Adjust the Volume

How do I adjust the volume on the M12/M22 amplifier?


The M12 and M22 amplifiers enable you to adjust the incoming ("listening") and outgoing ("speaking") volume.

To adjust your listening volume:

Use the thumb wheel on the top of the base.

Image of how to adjust your listening volume

To adjust your speaking volume:

Image of how to adjust the speaking volume

  1. Remove the cover from the amplifier.
  2. Remove the plastic screwdriver from the bottom of the amplifier.
  3. Use the screwdriver to turn the volume dial to increase or decrease the volume.