DI Box
A device that converts an unbalanced consumer signal to a balanced XLR signal for PA or desk input.
A DI (Direct Injection) box converts a high-impedance, unbalanced signal from a consumer source, such as the RCA or 3.5 mm output of a controller, into a low-impedance balanced XLR signal that a PA amplifier or front-of-house mixing desk can accept cleanly over long cable runs.
Why it matters
Consumer outputs are prone to hum, noise, and signal loss at distances over a few meters. A DI box solves both the impedance mismatch and the ground-loop noise problem in one unit, which matters whenever a controller feeds a venue's installed sound system.
