@jhills --
Last word in efficient or not, I prefer the big open and natural sound of electrostatics and planers over boxes, hands down, but that’s just my personal preference.
Absolutely fair.
Being natural representatives of the (very) high efficiency segment: do you have experience with horn speakers, be that horn hybrids or all-horns? Tall large-horn speakers can have a sound reminiscent of large panel speakers, certainly akin to a limited dispersion "big open and natural sound" you’re describing, and a sound that sets itself apart from smaller, low efficiency box speakers in general. Not trying to convert you into being a horn freak (I suspect that attempt would be futile), but just to break down more stereotypical assumptions of their characteristics as being in every case from the same piece of sonic cloth. With horns in particular, size matters, but few want to accommodate that in their homes.
If all I wanted was loud, forward and dynamic I’d buy a Jukebox.....Jim
I hope that’s not your condensed takeaway from what high efficiency is necessarily about. By contrast a jukebox is only representative of that: a jukebox.