 Tear down this wall!  was the challenge issued by United States President Ronald Reagan to Soviet Union leader Mikhail Gorbachev to destroy the Berlin Wall, in a speech at the Brandenburg Gate near the Berlin Wall on June 12, 1987, commemorating the 750th anniversary of Berlin.n the 1963  Ich bin ein Berliner  speech, U.S. President John F. Kennedy stated the support of the United States for democratic West Germany shortly after the Soviet-supported Communist state of East Germany erected the Berlin Wall as a barrier to prevent movement from East to West.
Feedback happens when a microphone picks up sound from speakers and then pipes that same sound back through the speakers and picks it up again. The never-ending loop of ear-pain is frustrating to experience, but fairly easy to fix by adjusting the levels of the speakers and microphone.
1 You can turn down your speaker volume to reduce the echo. 2  If your microphone or audio device is near a wall or other reflective surface that does not absorb sound, consider moving the microphone or changing its direction away from the reflective surface, so as to reduce potential echoes.ymptoms. If other people are complaining that they hear an echo when they are on an audio call with you, it might be caused by the audio device you are using.