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RE: What is Headroom and how can it be described?

I could be wrong, but 'headroom' would appear to be the difference between continuous RMS power and 'peak' or short-term power. This is for amps. Probably expressed in db, you'd find that 3db 'headroom' was 2x the power.

I'm sure a similar idea could be applied to speakers which might not like high, continueous power but would be perfectly happy at lower average levels with higher peak demand.

As applied to an entire system? Maybe they're talking about the dynmic range from softest to loudest passages and the ability to reproduce the loudest without distortion.
Too much is never enough

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