Oftentimes in audio systems it becomes necessary to take an audio signal and send it to two or more places. Just connecting the devices together may either load the signal down, or cause other undesirable anomalies.
A distribution amplifier is an amplifier that accepts a signal at its input, and distributes the signal to two or more outputs. Each output is therefore isolated from the other, to a greater or lesser degree depending on the type and circuitry.
As an example, consider a speech reinforcement system that requires a “press box” distribution that can accommodate up to 24 press feeds. In this way, a talker may make a presentation at a podium with one microphone rather than be obscured from the camera by two-dozen microphones with radio station call signs on them. The press corps simply connect their tape recorders to a receptacle on an output panel that provides a fixed, isolated signal from the output of a distribution amplifier. If one member of the press corps has a shorted cable, it would affect only his or her feed, rather than short the feeds to everyone else.
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