Why is my microphone squealing and creating feedback?

When does the feedback occur?

As soon as I turn it on:

Please submit a service request here. A member of our team will contact you within 24 hours of the next business day.

It slowly creeps louder and louder:

  1. Try reducing the master volume.
  2. Ensure you are not near a loudspeaker. If you are, please move out of close proximity.