Speakers that can reveal orchestral instruments' positions

Source is everything, ie, same story as is often true...garbage in, garbage out. I have many recordings that are crap, but some, same system, are wonderful , in regards to width and depth...check out the decades old “Omnidisc” from Telarc...terrific demonstration of this...

Hard to go wrong with most Telarc recordings.

I just received the Debussy Complete Orchestral Works on NAXOS, Orchestre National de Lyon, Jun Markl conductor. 9 CD set.

Exquisitely recorded.

I am also partial to DECCA/London, and Philips typically does a nice job. And the older Columbia, sometimes. Sony actually did a pretty good job remastering some of the old Columbia recordings.

Deutsche Grammaphon I find incredibly erratic in terms of their recording quality.

My tekton design moab's do a nice job of presenting a 3d soundstage.

This is a subject close to my heart.  I obsess about soundstage.  My first point is a bit annoying but I have to say the source and the amplifiction are contributors.  As for speakers: in my opinion they contribute the most.  Here is my 'Profound Statement':   Directionality is overwhelmingly  a function of treble.  So high quality speakers with tweeters that do 20 khz comfortably are a must.  Tweeters beyond the theoretical limit are (in my humble opinion and  contrary to others) a benefit.  My current position is that the overtones of instruments beyond 30Khz is relevant to directionality.  So in theory and my practical hearing means I try to buy between on 48 khz and 96 khz.  44.1 khz is fine. Vinyl is fine too.

All this from a pettifogger.  I have Matrix Audio DAC, EMM Pre, Pass Power, Magico Squeakers.

Electrostatics are known for their imaging qualities. Audition a pair of Martin Logans and see/hear for yourself