To follow through on Griff's explaination, take a look at this:
http://www.jensen-transformers.com/datashts/mbcpc.pdf
One of the outputs (for each mic's transformer that you want to include) has to have a convenient way to continue to the FOH, hence the need for a snake or whip end. A transformer is needed to isolate the FOH board from your board to minimize possible ground looping noise. The 'direct out' is his best bet. The isolated out is yours.
Best, Paul
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WUDAYAKNOW.. For the first time in my life, I'm wrong again!!
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