Loudspeaker

Converts sound into an electrical signal . According to the speaker changes the electrical signal moves through the air or water causes sound waves to propagate .

After the acoustics of the listening space , loudspeakers are the most variable elements in a modern audio system . Johann Philipp Reis installed an electric loudspeaker in his telephone in 1861, which was capable of reproducing pure tones . Alexander Graham Bell in 1876 as part of his telephone was patented the first electric loudspeaker . These were first loudspeakers used electromagnets ,

In the 1930s , loudspeaker manufacturers to increase frequency response and sound pressure level driver Bandpason the importance of the combination of two and three had begun . Are almost always permanent magnets and ceramic , ferrite , Alnico, or, more recently , rare earth such as neodymium and Samarium cobalt are made . Sound output quality of a loudspeaker system completely or essentially impossible to formulate in words . Objective measurements provide information on several aspects of performance ;