Which speakers vs Vandersteen 3A sig's in large rm

You seem to be describing a desire for Thiels. Other options include Green Moutain, Dunalvy and Meadowlark.

Stylinlp 38, I'm not sure what you mean by "...stuck with a Tyler Acouistic situation." I will say that both Dunlavy and Meadowlark are out of business.
My recomendations were based on the fact that all designs share major design philosphies with Vandersteen. I should mention that these very design philosphies seem to share the same lack of specific absolute excellence in dynamics. Thats not to say that they are lacking in this area, they just don't excell as well as some other designs that are willing to sacrafice other aspects of sound to give priority to this specific aspect. I have not personally heard the Green Moutain products so I can't comment on them. I have heard just about all the other's products. IMHO, based on your desired criterion, you might be well served by auditioning the Thiels. One caveat about the Thiels; they require top quality amplification and they benefit from a lot of it. Good luck.