Public address system - Alchetron, The Free Social Encyclopedia
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Public address system - Alchetron, The Free Social Encyclopedia
A public address system (PA system) is an electronic sound amplification and distribution system with a microphone, amplifier and loudspeakers, used to allow a person to speak to a large public, for example for announcements of movements at large and noisy air and rail terminals or at a sports stadi
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SOLVED:Consider the distributed public address system for an airport as shown in Figure 10.5 . It consists of an audio power amplifier with a nominal 70 volt RMS output that is connected to four remote loudspeakers, each separate from the others and some 150 meters away from the amplifier. Each loudspeaker assembly includes a 10: 1 voltage step-down transformer that feeds the loudspeaker impedance of 8 Ω(resistive) off its secondary. These four lines are fed in parallel by the amplifier. Determi
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