Which speaker is the master of IMAGING ????

If you "really" know what imaging is. The best at it is the VMPS RM40.

Best imaging I ever heard was a pair of Orignal Quads driven by Futterman OTL1's.

Bose 901's. Gives the "up-chuck" imaging!

I'm about to embark on the "final frontier", room treatment.
My Meadowlark Blue Herons are the most coherent speakers I've had in my own system, but my 21' x 31' essentially unfurnished basement listening room is very live with significant slap echo problem. It'll be interesting to hear the improvement in imaging from dousing all first order reflections (including ceiling) as well as placing diffusors behind the listening position (front corner bass traps as well). My hope is, after investing about a third what I paid for my used speakers, I'll finally be able to hear how they REALLY image. I'd appreciate comments from any who've successfully taken this approach to maximzing imaging (among other qualities)

Avalon Eidolons driven by Rowland Model 12s is the best I've heard. The soundstage was gigantic. Depth, width, height were all very realistic. In a choral piece (Cantate Domino), not only could you easily distinguish the left to right position of each singer, you could tell which singers were on risers.