Microphone Splitter Information Each microphone splitter features a 1:1, 1:1:1, or 1:1:1:1 turns ratio bridging transformer with a single primary and one, two, or three secondary windings. Transformers also maintain separate faraday shields and reject common mode noise caused by the voltage differences between the chassis of the multiple mixers. Phantom power can be provided by the mixer which terminates the microphone directly. The splitter is equipped with two switches, one to lift the ground to the isolated output(s) and the other to lift the chassis ground from the direct output for optimum performance.