Most Impact on Sound Stage/Imaging?

Room treatment.

C.. if you seal the inside of a wooden cabinet with Cascade V-Bloc that is a water based product designed to be absorbed into the wood pores and drys like concrete. Also use non ferrous fasteners for all drivers and crossovers,replace all resistors with non inductive type as sold by North Creek and others. Direct couple the speakers to the floor with points that are designed to collect, focus,and discharge resonant energy to a larger mass or ground.Tom

That's easy, Room Treatment! Until you've heard what a properly treated room sounds like you're missing a huge part of high end audio.

Fix the room, amazing results.. I just did it and its like adding a whole new system. The room is a system in itself period.

Well, room treatment is not possible (standard reason: negative WAF). I simply wanted to know which of the three (drivers, cabinet, crossover) affected soundstage/imaging the most.

Steve O.