Ok so I got my terminology wrong.Yes you can have a big baffle still with no box, as the IRS V has, but the Beta is truly baffle’less, as are the Plasma’s as are most ESL’s. The moment you ad "wings", you make a baffle and it re-enforces the sound but will also screw up the image compared to no baffle. That’s why very narrow speakers such as the Audio Physics image like there’s no tomorrow.
https://www.google.com.au/search?q=audio+physic+speakers&source=lnms&tbm=isch&sa=X&v...
The Infinity Prelude also had a good rep for imaging well.
https://www.stereophile.com/content/infinity-composition-prelude-p-fr-loudspeaker
" I could hear precisely where each instrument or voice was in the soundstage, and images were highly focused, tight, and compact, making the presentation sound like a collection of individual instruments in three-dimensional space. There was also a remarkable stability and tangibility to the images, further heightening the impression of instruments before me."
Cheers George