Music - studio and stage notes - devices you'll use

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Stage mostly

DI

✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.

DI box, DI, DI unit, Direct box. (some people argue over whether it stands for direct input, direct injection, direct induction, or direct interface. Most people don't care, because DI names a specific thing and function that we recognize, and isn't that the main point of a name?).

Functionally

Takes a high-impedance, unbalanced signal, typically on 6.35mm TS.

Outputs a low-impedance pro-mic-level balanced signal on XLR (pro mic level, because that is roughly the only thing XLR carries in audio context).

DIs were arguably made for guitars, but have other uses as well.

Passive DIs do so with a single audio transformer, so need no power, which makes them a no-worry functional addition - plug in and forget.

...but their simplicity comes with assumptions that are only usually true, and sometimes they lead to undue sound coloring, or higher noise levels.

In those cases, you want active DIs to fix that. They do a little more, but they do so using power (battery, adapter, and/or phantom power) so take a little more thought than just plugging in.

Studio mostly

Audio interface notes

Audio interfaces are often a combination of

• sound card and
• some specific-purpose inputs and outputs

both in terms of the plugs

and the amplification that some things need

On gain, and levels throughout

✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.