
The ability of an audio device to respond to musical peaks. For example, an amplifier may only be capable of a sustained 100 watts, but may be able to achieve peaks of 200 watts for the fraction of a second required for an intense, quick sound. In this example the dynamic headroom would equal 3 dB.
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https://www.encyclo.co.uk/local/20687

the additional power output capability of an amplifier when producing short-term peak signals, compared with its continuous-signal power rating. Also called
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https://www.infoplease.com/dictionary/dynamic-headroom
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