 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.
Audio-Technica ATR2500-USB Cardioid Condenser USB Microphone Condenser microphone with USB output for easy connection to your computer. Built-in headphone jack allows you to directly monitor your microphone output without audible delay.Adjust headphone volume with easy-to-use controls on the front of the microphone. Samson Meteor Mic USB Studio Microphone Nice chrome plated design, and a universal solution for recording music on your computer.Perfect for your home studio, Meteor Mic is also ideal for Skype, iChat or voice recognition software. really neat one-stop solution for recording on your computer, and one which will offer a considerable improvement in quality over a generic computer microphone and sound card combination, is to consider a USB mic.