What is a DI Box?

A DI box, short for Direct Injection box, is an audio device used to connect instruments such as electric guitars, bass guitars, or keyboards directly to recording equipment or mixing consoles. It converts the instrument’s signal into a format that can be transmitted cleanly over long cables without noise or signal loss.

Instruments like electric guitars and basses typically output a high-impedance, unbalanced signal, which can pick up noise when connected directly to professional audio systems. A DI box converts this signal into a low-impedance, balanced signal, making it compatible with microphone inputs on mixers and audio interfaces.

DI boxes are widely used in live sound and studio recording. They allow instruments to be recorded directly without using a microphone and amplifier, producing a clean signal that can later be processed with effects, amp simulators, or mixing tools.