- High-Q electrical circuits and acoustical devices have a tendency to oscillate (or ring) when excited by a suddenly applied signal.
- Term sometimes used to refer to a slight feedback condition. The point where feedback is just starting to occur, but isn't enough level to be sustained. "His lapel mic is starting to ring, turn down the level a little." The sound heard of excited upper frequencies (above 2kHz) before reaching the point that they are self-generating.
- Another term used for full-fledged feedback. "The system was ringing loudly before the speakers stopped working." Source: Church Audio & Acoustics Glossary