Radial Engineering StageBug SB-5 Passive Laptop DI BoxSeamlessly Connect Your Laptop to Professional Audio Systems The Radial StageBug SB 5 is a compact and robust passive direct box designed for connecting laptops and other consumer audio devices to professional PA systems. It converts unbalanced stereo signals into balanced mono, eliminating noise and ground loops for clear, reliable audio. Ideal for musicians, presenters, and AV technicians. Key Features: Passive Design: Requires no external power.