SAMPLED

Live sound and performance · updated 2026-08-16

DI BOX

Converts an unbalanced instrument-level signal to a balanced mic-level one so it can run long cable to the desk.

A front-of-house position at a concert venue before doors: digital mixing console, laptop and racks facing the stage — the live rig behind the FOH, monitor and PA terms here.
Live sound and performance — A front-of-house position at a concert venue before doors: digital mixing console, laptop and racks facing the stage — the live rig behind the FOH, monitor and PA terms here.

Photo: McFly Power to Play Tour, Bridlington Spa front-of-house pre-show (opens in a new tab) by Hullian111 (opens in a new tab), via Wikimedia Commons — CC BY-SA 4.0 (opens in a new tab)

Key takeaways

  • Converts an unbalanced instrument-level signal to a balanced mic-level one so it can run long cable to the desk.
  • Active DIs add a preamp for low-output pickups; passive ones handle hot signals.
  • Bass, acoustic pickups, keyboards and laptop outputs all reach the desk cleanly through DIs.
  • Watch out: running a long unbalanced jack cable to the desk instead.
  • Sits under live sound and performance in this glossary, with 2 primary sources below.

Quick checklist

  • Can you define di box in one sentence without looking?
  • Can you point at di box in a real session, mix or contract?
  • Have you tried the practical move above at least once?
  • Would you catch the common mistake before it costs you a take?
  • Have you opened one of the primary sources below rather than a forum thread?

DI BOX IN DEPTH

A DI box converts a high-impedance, unbalanced instrument output into a balanced low-impedance signal that can run a long cable to the stage box without noise or high-end loss. Active DIs add a preamp for low-output pickups; passive ones handle hot signals.

How it works in practice

Bass, acoustic pickups, keyboards and laptop outputs all reach the desk cleanly through DIs.

The mistake people make

Running a long unbalanced jack cable to the desk instead. It picks up hum and loses top end over distance.

WHERE DI BOX SITS

DI box belongs to live sound and performance in the Sampled music glossary. The stage vocabulary: what the engineer means when they wave at you.

TEST YOURSELF

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3 quick questions on di box. Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes di box?

  2. 2. What is the mistake people most often make with di box?

  3. 3. In practice, which of these applies to di box?

Ready for the full thing? Take the 25-question terminology test and get a certificate with your name and score.

SOURCES AND CITATIONS

Free, primary references for di box — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • Shure — DI basics (opens in a new tab)

    Primary reference · service.shure.com

    “Converts an unbalanced instrument-level signal to a balanced mic-level one so it can run long cable to the desk.”— the claim this source supports

    Why it counts: Published by the organisation responsible for the thing being defined, so it is a first-hand source rather than a summary of one.

  • AES standards (opens in a new tab)

    Professional standards body · Audio Engineering Society

    “A DI box converts a high-impedance, unbalanced instrument output into a balanced low-impedance signal that can run a long cable to the stage box without noise or high-end loss.”— the claim this source supports

    Why it counts: AES writes and reviews the engineering standards and peer-reviewed papers this terminology comes from.

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