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A sound reinforcement system is an arrangement of microphones, electronic signal processors, amplifiers, and loudspeakers that makes live or pre-recorded sounds—usually music or speech— louder, or that distributes the sound to a larger or more distant audience. [1][2] A sound reinforcement system may be very complex, including hundreds of microphones, complex mixing and signal processing systems, tens of thousands of watts of amplification, and multiple loudspeaker arrays, all overseen by a team of audio engineers and technicians. On the other hand, a sound reinforcement system can be as simple as a small PA system in a coffeehouse, consisting of a single microphone connected to a self-powered 100-watt loudspeaker system. In both cases, these systems reinforce sound to make it louder or distribute it to a wider audience.[3]

Audio engineers and other sound industry professionals disagree over whether these audio systems should be called Sound Reinforcement (SR) systems or Public Address (PA) systems. Some audio engineers distinguish between the two terms by technology and capability, while others distinguish by intended use (e.g., SR systems are for live music whereas PA systems are usually for reproduction of speech and recorded music in buildings and institutions). In some regions or markets, the distinction between the two terms is important. The terms are also considered interchangeable in some areas.[4]

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sound-reinforcement system ( ′sau̇nd ′rēin′försmənt ′sistəm ) ( engineering acoustics ) An electronic means for augmenting the sound output of a

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Re: Why use a mic that cuts off at 40 hz for orchestra?

... the goal of the PA (or in more modern usage - Sound Reinforcement) system. Many orchestral SR systems are used for making announcements, etc. and not for reinforcing the orchestral instruments. Orchestras are supposed to be acoustic, not ... (Especially since I imagine one doesn't want to record the sound coming out of the speaker) No, you would not do ...