Behringer ultra di active di box di100 behringer di100 the behringer di100 di box ultra di is a professional and multipurpose unit designed to interface line level equipment e g guitars keyboards with the microphone level input of a mixing desk the unit performs level matching balancing and depending on the level of input either buffering of an active signal or impedance matching of a passive signal this unit comes in a rugged road proof aluminium case with stackable rubbe