I owned & lived with several different full-range electrostatics for >30 years and only recently discovered that they should be considered "open baffle", and therefore subject to all the caveats that are now well known and frequently discussed. Before that I had many different box speakers and Altec A7 horns, which sounded great for the rock that I listened to at that time, but sometimes only >50' away & outside the house! OB quality & attributes are striking at first I found, but the shortcomings seep in and nag you until you get them set up right - then MAGIC happens! My Spatial M3 Turbos pretty much blow away any of the electrostatics I had as far as imaging specificity, stability and 3D size are concerned, and they need a subwoofer for the bottom octave just as much as the electrostatics did. However, the bass quality (on both types) is to my ear at least, is far more realistic than any box speaker I have ever heard. Realistic, true to life sound is my metric, not everyone else's, but that's OK with me. I find myself listening to my homemade OB F15s more and more and liking them as much and occasionally more than the Spatial M3t's which is both gratifying and a very big surprise. I can't imagine ever going back to box speakers of any sort - they are, more than anything else, way too colored for my taste.