How ALSs Operate
Like public address systems, ALSs convert live or recorded sound into an electromagnetic signal. A sound source (usually a microphone) sends the signal to a transmitter which relays it to receivers provided to listeners. Couplers, such as ear phones, decode the signal from the receiver and convert it back into sound for the user. Recommendation: While a "complete" system with the necessary components can be bought off-the-shelf, ALSs designed as "mix and match" systems can provide a range of components appropriate for individual users, events, and environments.
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