They are a combination of microphones, signal processors, speakers and ceiling speakers which all controlled by a mixing controller that makes live or pre-recorded sounds louder also, the sound strengthening system is used to
enhance or change the sound of sources, usually using electronic effects, such as echo frequency rather than just amplifying sources unchanged.
Sound systems, speakers and ceiling speakers may consist of hundreds of microphones, complex live sound mixing systems, signal processing and thousands of watts of speaker power, multiple speakers all under the supervision of sound engineers and technicians.
 These sound systems consist of several components, including speakers, microphones, conference phones, smartphones, tablets, radios and interconnection systems