Question 1

What does a DI box actually do?

Accepted Answer

It converts an unbalanced, high-impedance signal (like a guitar, keyboard or laptop output) into a balanced, low-impedance mic-level signal that can run long cable distances into a mixer without picking up hum or noise.

Question 2

Active or passive DI?

Accepted Answer

Passive DIs are simple, transformer-based and don't need power — great for high-output sources like keys and active basses. Active DIs need phantom power or a battery but handle low-output sources (passive pickups, acoustic guitars) better.

Question 3

Do I need a system DSP?

Accepted Answer

If you're running a permanent install, yes — DSP lets you tune the room, protect speakers and recall settings. For portable PA, a digital mixer often has enough on-board processing.

Signal Processing & DI

Buying guide & FAQs — Signal Processing & DI