Soundstage and explosive dynamics?

Try to find a pair of used pro studio main monitors. These are the big speakers that are often mounted in walls - Westlake, ATC, Genelec. Meyer etc.

Don't take my word for it....  Read the review in Stereophile. 
https://www.stereophile.com/content/focal-aria-936-loudspeaker
I think it's a balanced and accurate description of the speakers which I strongly agree with which seems to fit the bill of demands you've got. The larger 948's are even more of this. 

What you are looking for may be a larger speaker rather than smaller.  

I am loving the dynamic shading I get from the Klipsch Cornwall speakers.  Very hard to beat for the money.

RCA shearer horn system you may have to do a bit of set up but you can buy the parts for about 10k

Focal Utopia should do it. There is one here for sale for about $12k, you could probably have it for $10k. It can sound a little bright with some solid state equipment and wrong cables.