5. Active or Passive?

Passive DI boxes have the advantage of requiring no power. They use transformers to isolate and convert the output signal to a balanced line, and they are usually cheaper than active models. The downside is that they tend to exhibit a small amount of high frequency loss.

Active DIs are usually powered by a 9 volt battery, or by ‘phantom power’ – this is a 48 volt current normally supplied by your mixer - remember to press the +48V button though, or it won’t work! Phantom powering is generally a better choice than batteries, especially for live use where a spent battery would spell disaster, but they do tend to be a little more expensive.

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