Sound reinforcement system

PA systems are electrical systems that amplify audio signals from microphones, electronic or electromechanical instruments or recording equipment and made ​​available by speakers of human perception. Two types are generally distinguished:

• The PA system is often designed for event equipment such as disco, live or live performances also for mobile use, where PA stands for Public Address here (not for power amplifier) ​​.
• The ELA ( Acoustic electric plant or electric loudspeaker system ) is a fixed system for the comprehensive sound of buildings, sports facilities and other exterior surfaces.