Sound amplification by stimulated emission of radiation phenomenon, known as the Larsen effect, is the result of a positive feedback. In general, every oscillator consists of three main parts. These are the power source or pump, the amplifier and the positive feedback leading to the output. The corresponding parts in a SASER device are the excitation or pumping mechanism, the active (amplifying) medium, and the feedback leading to acoustic radiation. Pumping can be performed, for instance, with an alternating electric field or with some mechanical vibrations of resonators. The active medium should be a material in which sound amplification can be induced. An example of a feedback
A-sound featured two bonus live cuts. Later in 2009, A-Sound began recording a follow up album, but after becoming unsatisfied with the results, scrapped it. A-Sound covered a song from The Beatles. A-sound A-sound is a Mongolian indie rock band. They have had success in Mongolia with songs and albums released in both Mongolian and English versions. Their single "Release" was number one on the Mongolian chart for nine weeks. "A-sound " with five members (Lead Vocalist, Pianist, Bass Guitarist, Drummer, Solo Guitarist ). Before the band gathered they used to play separately. In 2006 all members decided to become band