More often known as a ‘DI’ box, these little units are the most commonly used problem solvers both in the modern recording studio, and with live PA systems. Essentially, a DI box provides a method of connecting a high-impedance ‘unbalanced’ line level signal, such as a guitar or keyboard, to a low-impedance ‘balanced’ line input on a mixing console or other input stage – more on these terms later. There are many different models on the market, with many different feature sets - we’ll also examine these in this article.

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