For running two mixers at once - perhaps one for the monitorand one for aster out to PA system, or one for broadcast and one for PA, or a performer wants his/her mic split into a powered monitor and the PA - you need the ability to split the signal from the source so that it can go bothways. It is important that the output of the source encounters the right impedance. Since you may be splittinghe balanced output of an instrument amp or reamp, another consideration is "hum" caused by a ground loop
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