Okay thanks for the explanation on parameters can vary with input conditions, I was not aware of that. Unfortunately no freq sweep graph is available for these particular drivers.
I am fairly sensitive to listening fatigue over long periods (I often have low/mid level volume music playing for hours at a time while working at my computer). I recall a post that you can listen to the 2226 for hours with no or minimal listening fatigue issues (this comment is the main reason I chose the 4pi over the 3pi).
Now that the Definimax 4012HO has been playing for a while in the 3pi, any comments regarding any listening fatigue experience compared to the 2226 driver? If minimal, the 3pi could be a good choice for me as well (while meeting my new budget).