No.... You're not understanding this problem right at all. Stop thinking about this as a wattage problem. Wattage is an abstraction and those calculators you linked to are not at all telling you what you need to know. Focal speakers are designed to be driven by a voltage source. That's how their sensitivity is described. Efficiency per watt is a very useless measure except for very, very benign loads. For the purpose of this discussion ignore watts completely. We're talking voltage source amps for voltage driven speakers so let's talk voltage and sort out the current next. Once you understand your voltage demands based on the speaker's sensitivity, then we can plug in it's impedance and determine the current demand. Only after we know the voltage and current requirements can we calculate the wattage, which may or may not make any difference based on the class and topology of the amp.
OK, I'm with it. So I need to know the amp's voltage delivery and the speaker's voltage requirement right?
Here is something interesting, a spec sheet thats different than the one I got in the box.
https://www.focal.com/sites/www.focal.fr/files/shared/catalog/document/chorus_807v_w-specification_s...
Interestingly it has a RMS wattage rating which mine does not (not to harp on wattage - this is interesting though).
I can't find either of these two metrics for either product. But I did learn the RMS for the speakers is 110 and thats more than 2x what I'm giving it. Also that the lowest impedance point is 4.2 ohms at 118hz (mid bass!).
AM I on the right path? My thought has been all along that its the bottoming out of the impedance at 4.2 in the mid bass spectrum thats to blame for this. And from what I've read (right or not) is that the only way to combat the impedance is to drive through it with more current, not necessarily wattage.