absorption    Damping of a sound wave passing through a medium or striking a surface. The property of materials, objects, or media to absorb sound energy.

AC    Abbreviation for alternating current, which is an electric current that keeps reversing its direction.

acoustics    The science of sound. The factors that determine the quality of received sound in a room or auditorium.

ad lib    To cover an unexpected situation in a show or hide a lapse of memory.

alignment    The process of setting controls and functions for optimum system performance.

ambience    The combination of reverberation and background noise that characterizes the sound of a given room.

ampere    The common unit of current; the rate of flow of electricity; abbreviated ...

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