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The DI box (for direct injection or direct input), also known as a direct box, is a device who’s main basic function is to convert the unbalanced high-impedance output of an instrument’s signal into a balanced low impedance one, which in turn allows longer cable runs without adding noise, among other benefits.
In their most basic setup, DIs are usually equipped with at least one input and two outputs; one being a through-put for an instrument amplifier and the other for input to a PA system. The second of those outputs works through an XLR connection which also allows it to be connected to the microphone inputs of a mixer (more on that in a bit). Another extra function of the direct box is its ability to eliminate AC hum that stems from ground loops. It should also be noted that DI’s come in two main flavors – active and passive. All this is well and good, but what does that mean for you and your sound? Well, let’s take a deeper look into the world of DI’s and find out, but first…
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