I am trying to convert a unbalanced RCA output from a DJ mixer to a balanced output of XLR so I can run it to a set of power speakers. My fear with just going with 1/4" is the interference that will get picked up on the run to the speakers. My initial thought was to use a DI box, but I have read that many cheaper models will cause more of a hum than without them. What would my best bet be? The run to the speakers could be anywhere from 25' to 50' worth of cable.