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Since I'm using WinISD to do the analysis, and the voltage measurement method was given the OK by one of the WinISD authors, I'll use it.
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Yep, and I completely agree. I was just musing about this stuff - I don't want to get the thread off track..
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If the power delivered to the driver followed the impedance graph, you would expect the SPL graph to do the same, yet this is not the case.
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Well, I think the fact that the SPL units being logarithmic (dB) have a lot to do with that. Doubling the applied power only nets a +3dB increase in SPL. Kinda smooths the SPL graph out in relation to large swings in power. You could increase the power from 500 watts to 1000 watts and the SPL graph would only show an increase (for example) from +113dB to +116dB.
But certainly the reactive components will store and release energy that can be reflected back to the load and result in heat being dissipated by the output stage of the amplifier itself. The power graph that WINISD provides is apparent power ( expressed in volt amps). This would be a combination of the RMS or real power dissipated in the resistive load (Re) plus the reactive power as a result of the inductance and capacitance of the driver. It would simply be the product of the current squared times the impedance over the frequency range.
brucek