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- A digital, analog, or mechanical device employed to delay one audio signal with respect to another.
- 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
- Any ladder filter or transmission line which introduces a delay in time for a signal passing through.