direct input A DI unit (direct input or direct inject) is an electronic device typically used in recording studios and in sound reinforcement systems to connect a high output impedance unbalanced output signal to a low-impedance, microphone level, balanced input, usually via an XLR connector and XLR cable.
A DI box, or Direct Injection box, is a device that converts an unbalanced, high-impedance signal from your guitar/bass into a balanced, low-impedance signal that is ideal for further processing and amplification.
What does a DI box actually do? DI Box: What does & can it do? | Palmer What is a DI-Box? Direct boxes are called "DI" boxes, which stands for "Direct Injection". Their primary purpose is to convert unbalanced or high-impedance instrument signals into a signal suitable for direct connection to the microphone input of a mixing console - whether live on stage or in the recording studio.
