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Old 20th March 2008, 02:38 PM   #11
Brian Beck is offline Brian Beck  United States
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Yes, the mass of the diaphragm plus the mass of the air on either side (as opposed to the resistance of the air) are part of a resonant system that goes inductive at certain frequencies.
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Old 17th April 2008, 08:16 PM   #12
Mike Beck is offline Mike Beck  United States
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The diaphragm may take a small amount of energy to make sound but the majority of work is done by the amplifier charging and discharging the panel capacitance at the audio frequency. This causes two types of losses in the amplifier: switching loss and conduction loss which account for the heat generated by an amp driving an ESL. An ESL is very efficient if you don't include the amplifier loss. Another way to look at it: the amplifier sends current to the ESL but the ESL returns most of it which the amp must dissipate. This is often referred to as circulating current.
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