Distribution amplifier
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In electronics, a distribution amplifier is a device that accepts a single input signal and provides this same signal to multiple isolated outputs.
These devices are important in audio electronics because they allow an audio signal to be distributed to multiple destinations without ground loops or signal degradation. They are used to solve a number of common audio engineering tasks, including multiple amplification, splitting monitor and front of house mixes, and "tapping" a signal prior to sending it through effects units to preserve a "dry" signal for later experimentation.