I'll add here that power factor in terms of a power distriibution system is usefull because you're only talking about one frequency. So, the power factor calculation comes up to be one nice, steady number. If you were to distribute power as a broad band signal (pink noise, lets say) you'd have a different situation completely. (Not to mention that motors pretty musch wouldn't work at all!)
So the power factor of an amp driving a transducer (whether it be a speaker or headphone) is going to vary significantly from one instant to the next depending on what just happened and what the amp is trying to make make happen. So power factor is continually changing and sometime the amp is 'ahead' of the speaker and sometimes not.
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Cheers!
Tyll
(Like on the floor, only spelled different.)
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