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You cannot connect a microphone directly to the DD600.  This is because there is no microphone preamp ( also called a MIC PRE) built into your DD600. A great solution is a MIC800. This will boost the signal of your mic so that you can connect it to the INPUT of a DD600. You can see a MIC800 at: http://www.behringer.com/EN/Products/MIC800.aspx