Why do I hear an echo when I speak?
If you or your attendees hear an echo in the webinar room, it may be caused by the device you are using. This happens when multiple people are speaking during the webinar and at least one of them is using loudspeakers in their hardware configuration. In this scenario, audio from the computer’s loudspeakers is caught by the microphone and played back to the webinar, causing the feedback issue (echo).
You can fix this by having all of your speakers use headphones or dedicated headsets.