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Bass player Tony Levin test 12-DI boxes with retrospec Juice Box being one of them. The 4-judges (Jerry Marotta, Robert Frazza, Larry Devivo, Pete Caigan) give critical acclaim to retrospec Juice Box and Evil Twin.
A DI unit, DI box, direct box, or simply DI (variously claimed to stand for direct input, direct injection, direct induction 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 level balanced 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 bridging to minimize noise, distortion, and ground loops.