-PRO Premium Direct Injection Audio Box – Passive DI Unit Hum Eliminator W/ Inpu
The hum eliminator is used for connecting unbalanced devices as well. A DI unit, DI box, Direct Box, Direct Input, Direct Injection or simply DI is an electronic device that connects a high impedance, line level, unbalanced output signal to a low impedance mic level balanced input, usually via XLR connector.