ang di box stands for direct injection box duon dumadaan ang air-fuel mixture papunta sa cylinder. ay maling forum. direct injection pa di or direct insert.eto yung pwede ka magtusok ng gitara direct to the board using this box.active di needs power,passive di is based on impedance matching transformers and does not need power.thus using a du box,you can,say,record a guitar which is connected to the board via the di box,without having to use an amp and miking that amp.was hat clear ba? so bored i'm philmusicking from my celfone...