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OK, say a power source (amp) delivers a waveform to a 4 ohm load (speaker). At any instant in time, the power delivered is P = V^2/R. That is the dynamic power that Infinity lists... it's a maximum instantaneous power, usually called peak power by other companies. i guess infinity's marketing decided that dynamic was more mysterious and thus more effective.
dynamic or peak power is not a very useful measure though. better is the sustained power that the amp can deliver without over-exerting its components. the RMS (root mean squared) power is related to the RMS (average) voltage of a sinusiod. RMS Power = Vrms^2/R = (Vmax/0.707)^2/R. match up this power with the power handling of your sub. overshooting or undershooting doesn't matter much, like i've said before.
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