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1.
A digital, analog, or mechanical device employed to delay one audio signal with respect
to another.
2. A circuit in a sound reinforcement system used to
drive fill speakers or speakers located anywhere other than where the main
speaker(s) are located. A digital delay is used to align the arrival of the two
signals (the main signal and the fill signal) so they are heard as one sound
and not two. Thus, the people at the rear of a room sitting in the coverage
area of the fill speaker will hear the sound from the main speaker and the
fill speaker at the same time.
Source: Church Audio & Acoustics Glossary
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