That's the best part about this forum - contributions range from from reveling in joy of finding an old pair of JBL's to incredibly insightful engineering pursuits.
I was rivited by the thread you refer to - I found myself reading and re-reading it. While exhibiting a high level of understanding, all the posts in that thread were incredibly legible and supported by graphics. While not contributing to the thread pesonally, I found much that matched observations of my own, which I didn't understand the reason(s) for. That said, the discussion of the change in the voltage drive of the 2122 when going from passive to biamp has caused me to go take additional measurements out of curiosity.
You can't match the depth of this place.