[quote name='EBS_freak' timestamp='1470748445' post='3108121']
A mixer with at least an aux.
From that aux you send everything you want to hear to a headphone amp with your in ear monitors plugged into.
When mixing, take the stance that you can only hear what you put into your mix. So if you want bass - you'll have to at least DI to the mixer. If you want drums you'll at least need a single overhead... If you want to hear guitars, you'll have to put a mic in front of the guitar cab. Of course, you can use as little or as many mics as your mixer allows for - but this all adds to set up time - but enables you finer control over your mix. So in short, yes, you could get away with a single mic to capture the ambient sound of the band and a DI feed - but your mix could be so much better.
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Makes total sense!