Active Sensing

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Describes a circuit containing transistors, ICs, tubes and other devices, that require power to operate and are capable of amplification.

For more information on any other pro audio terms you are struggling with, please see the Glossary of Terms.

The sound characteristics (or ambience) of a particular environment. For example, the term 'live acoustics" would be used to describe a room in which the sound Wavesreverberate off the walls and ceiling, while "dead acoustics" would describe a room in which the sound Wavesare absorbed by the surroundings.

Acoustics in Recording

DI = Direct Inject

Digital-to-audio conversion, as performed by Digital Audio Converters.

Analogue-to-digital and back to analog, a common shorthand when referring to the function performed by Digital Audio Converters.

Digital-to-analog conversion, as performed by Digital Audio Converters.

Analog-to-digital conversion, as performed by Digital Audio Converters.

A D.I. or direct inject unit is a device that connects a high-impedance, line level signal to a mic-level device.

Usually a box, or less commonly a multi-channel racked or unracked unit, the box contains buffering circuitry that allows you to connect line-level equipment, or commonly, acoustic guitars pickup outputs, to consoles and studio gear operating at low-impedance mic level.