Stereophonic balloon is the function of how matched your left and Right speakers are, the recording trickery and how well controlled your room RT60 is.
@kofibaffour That’s an oversimplification and there’s much more to it than how matched the L/R speakers are. There are several aspects of speaker design that can contribute to the ability of a speaker to image/soundstage better than another including time and phase coherence among others. The OP’s experience is a good case in point where the Fyne speakers with their concentric midrange/tweeter design and first-order crossover between the midrange and tweeter are purported to be time and phase coherent where the Klipsch are most definitely not (and there are undoubtedly other reasons why they didn’t image/soundstage as well), and the OP was clearly able to hear the superior 3D imaging of the former in the same room with the same equipment and music. That pretty much says it all right there. But there are plenty of non time/phase coherent speakers that also can produce an impressive 3D soundstage if it’s in the recording so there’s more than one way to skin a cat. But regardless of how it’s achieved some speakers clearly have a better ability to do this than others, and while obviously you want L/R speakers to be matched it’s not the only thing involved in creating a voluminous 3D soundstage as there’s much more to it than that.