The Stewart Audio ADB1 is an active direct box, which is what the name stands for, suitable for use both on the stage and in the studio. It does require either power from a battery or phantom power. The ADB1 is made up of analog parts with unbalanced 1/4" connections for input and output and a balanced XLR output as well. The box also has switches for on/off, ground lift, and for choosing between either speaker or instrument.