Enjoying the thread so far, looking forward to the blind tests and more sonic comparisons, thx for the effort

Could you give us a little bit more detail on why you choose this particular test though? And what it's supposed to establish?
One thing I find might be problematic is that when playing a tone, you don't really know how that tone corresponds to the rest of the frequency spectrum... For example, speaker1 might be -8dB at 36hz vs Speaker2 only be -4dB at 36hz vs the rest of your FR... So even if speaker1 could play that test tone louder, it would always sound recessed compared to the other speaker when playing music...
But I guess the idea was just to see what it takes to bottom out the woofer...
Anyhow, I can read the graph, but don't quite see it's relevance... When playing at high SPL, will speakers usually crap out from 36/45 hz before 60, 80, 120, etc..? It's interesting, seeing their performance

But I think it's hard to establish something like bass performance/response from it...
Would you have 20hz-20khz measurements taken at your listening position from all speakers? That would be interesting to see too

And would give more of an indication of sonic signature. But in room measurements like that... In my experience and room... Can really be problematic... (really not very consistent, and you measure a lot of "the room")