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1. Is this essentially the modeling of the anechoic response curve?

yes

2. Where does room gain start to kick in? I seem to remember 30Hz, but I'm not sure.

No rule of thumb here, no room is like the other...but the smaller the higher it begins. 30 Hz is for a mid-sized room

Is there a 'rule of thumb' I can apply to "pushing them" or is this strictly a trial and error thing? I am guessing this is where Klippel or Dumax tests would be useful (if one knew how to interpret them)??

To my understanding "pushing" is when the driver is at the onset of becoming non linear.

 

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There will be graphs of distortion, port compression, frequency response, etc. showing how a SDX15 or a LMS18 is superior to my IXL-18.

Is this at the same SPL?:scratch: