DI boxes convert unbalanced, high-impedance signals from instruments, keyboards or line-level sources into balanced low-impedance signals suitable for long cable runs and standard XLR inputs on mixing consoles. The selection here includes both active units, such as the BSS AR-133 and Whirlwind IMP 2, and passive designs like the Whirlwind EDB1 and Pro Av2, covering different gain and isolation requirements found on stage and in the studio.
These units are used wherever a clean, hum-free connection is needed between backline or playback equipment and front-of-house or recording systems. Ground-lift switches and transformer isolation on several models help reduce noise from earth loops, making them a standard part of audio signal chains for live events, broadcast and studio sessions across stage, studio and film production work.