DI (Direct Injection) BOXES

A DI unit, DI box, Direct Box, or simply DI (variously claimed to stand for direct input, direct injection or direct interface), is a device typically used in recording studios to connect a high-impedance, line level, unbalanced output signal to a low-impedance microphone levelbalanced input, usually via XLR connector.

DIs are frequently used to connect an electric guitar or electric bass to a mixing console's microphone input. The DI performs level matching, balancing, and either active buffering or passive impedance matching/impedance bridgingto minimise noise, distortion, and ground loops. 

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