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Most of the larger amps also have massive storage capactitors in them as well for when they need the power (short bursts) so it is't necessarily coming from the circuit at all times.

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I agree and that's what they mean by head room.   But I'm willing to bet that you will very rarely get a fully dedicated electrical circuit in a bar.   And I doubt if it will be 20 amps.   So that is what I'm basing my conclusion on.   Two amps, Two circiuts.  To get the full power your amp requires to run, so it isn't under powering the speakers.

This should conclude the amp/power lesson.