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Old 03-05-2009, 10:45 PM   #14 (permalink)
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Originally Posted by NeilBlanchard View Post
Hi James,

There is probably very little connection between what an amplifier is rated at, and what it actually is able put out into a dynamic load (the loudspeaker and it's crossover). Also, there will be losses since no amp Class A/B amp can be very efficient, by definition.
Sure. I was giving a simple ballpark figure for an upper limit on the power draw. Beyond that, I'll leave it to the EE types, except to remark that the amps & other electronics can't be all that inefficient, since the wasted energy would appear as heat.
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