A/D converter
Analog/digital converter, an electronic component that transforms analog voltage curves, that is signals, into binary information
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AC
Abbreviation for alternating current
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Active system
A sound reinforcement system with integrated power amps; see page 4.
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ADP
Short for Advanced Driver Protection, an electronic protective circuit for tweeters developed by HK AUDIO.
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Aerial rigging track or rail
Metal fixture on cabinets that accepts chains to rig them up for flying
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Aeroquip
Locking studs that engage in a rigging, aerial or fly track and provide an eyelet for hanging cabinets
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AES/EBU
A digital interface for audio data used primarily in professional applications
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AFL
Short for after fader listening; the process of tapping into and auditioning a signal, generally an aux bus or subgroup, after (or post) it has reached the master fader using headphones
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Algorithm
A precisely-defined procedure for computing a mathematical problem or accomplishing a task
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Alignment
The adjustment of delays in milliseconds to ensure coherence among different speakers, for example, to align different horns to compensate for the varying depths at which drivers are mounted in the chassis
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Ameise
German term for ant and a brand name for a hand palette truck or small forklift similar to a Walkie Stacker
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Amp
Short for amplifier; also referred to as a power amp.
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Ampel
German for traffic light. This is a 180° or 360° array of speakers suspended under the venue's ceiling. Usually part of a permanently installed system, it serves the public address purposes, principally for announcements. Its poor performance in reinforcing musical signals rules it out for concert use.
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Analyzer
A measuring device that evaluates an audio signal's frequency composition and provides a graphical view of the frequency spectrum. It serves to check frequency response when voicing PA and monitoring systems.
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Aux bus
A mixing console output circuit for patching signals to effect devices or monitor busses. Every aux bus has an extra signal bus enabling the creation of a separate mix that is entirely independent of the end mix. To this end, each mixing console channel sports an aux knob that adjusts the aux bus signal level.
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