That 4m distance to the listener is surprising to me. Does one need that distance for the drivers to integrate? Amazing to me that people listen to much larger speakers with multiple drivers at closer distances. (MikeL, SteveW) If 3m were enough for the O96, they would work in a small room like mine (15' X 16'). As it is, my speakers are about 4.5' from front wall and 4.25' to sides and 9.5' to listener.
I'll just add my experience for what it's worth:
I auditioned the O/96 very extensively, in more than one demo room, as I was deciding between the O/96 and Joseph Audio Perspective speakers (two speakers that really grabbed me, though quite different in presentation. I ended up with the Josephs and love them, but the Devore still call to me somewhat).
My main problem with the O/96 was that they REALLY needed at least an 8 foot listening distance in order for them to cohere and do what they do best. I have a similar size room to you, though even smaller - 15' x 13'. However it was remodeled with the help of an acoustician, and has a wide room opening, the result being that it's a great sounding room and every speaker I've put in there, even big Thiel 3.7s, have had no problem with producing even sound from top to bottom. I'd say from what I heard the O/96 would be the biggest challenge, as they are pretty ripe in the bass. But I can pull them out quite far from the front wall. I haven't had a home audition but may do so at some point.
I went with the Joseph speakers partially because they are coherent even from close listening distances. My situation has generally put be between 6 to 7 1/2 feet from speakers, and everyone I've owned has been fine (even my current Thiel 2.7s that I also own).
This is why I brought a tape-measure each time I auditioned the Devore speakers. With the Devore O speakers, be it the 96 or 93, at 8 feet or beyond they had an open, lively, snappy coherent sound. But moving even a bit closer than 8 feet the sound would "dissolve" a bit, lose some high frequency extension, that "snap" of the drums that were so alluring would darken and mellow and get a bit less dense, and coherency issues with the woofer and tweeter would start to arise. I tried getting back the high frequencies when closer by toeing the speakers in even more, but it wouldn't really fix the problem. They just need a certain distance to snap together and open up. Which makes John Devore's recommendation of 8 feet or more make sense. I've read elsewhere of even the skinnier more conventional Gibbon models requiring some distance to work as well, so I wonder if there is something in Devore's crossover/driver choices that drives this.
I only started re-considering the O/96s again when I realized a way I could eek out a bit more listening distance in my room, to get that 8 foot distance, which is why I may try them in my place at some point just to scratch that itch.
My most recent speaker purchase (I had to replace my Thiel 3.7s for some aesthetic/ergonomic reasons) took me on a tyipcally obsessive (for me) two year search auditioning everything in sight within a comparable price range (new or used). I auditioned various models from
Raidho, Magico, Focal, B&W, Kudos, Kharma, Spendor D series, Audio Note, Audio Physic, JM Reynaud, Paradigm Persona, Harbeth, Revel, Monitor Audio, Proac, and others.
For me (and as someone who obsessively compares live to reproduced sound, even to the extent of doing my own recordings for such comparisons), nothing "did it" for me quite like the Devore O speakers. They simultaneously sound "more speaker-like" than some of the new-school speakers mentioned above, and "less speaker like" at the same time. More speaker-like insofar as the bass is a bit rich and not the tightest and the sound can be more obviously "coming from a big speaker box" at times than a Magico or whatever. On the other hand there is a "life-force" vibe with the Devores in terms of dynamic, feel and tone, that I don't get from those other speakers. The way I always feel the bass drum of the drummer, the way the tone of the Devore produces that papery "snap" of a snare that my brain recognizes as "right and real," makes drums, and many instruments just that much more convincing to my ears. I also adore how rich the O speakers sound, giving instruments a bigger size and heft than many ultra-clean speakers. That to me is actually more what I hear with real instruments - most reproduction to me sounds diminished, squeezed tight. Whenever I hear a real sax or trumpet etc the sound is SO much bigger and richer than anything I hear from reproduced sound in most audiophile set ups, and I find, whether it's a coloration or not, the O speakers enrich instruments in a way that reminds me of the real thing.
(I don't strive for absolute realism btw, that's generally impossible across the board - but I like when a system has characteristics that can remind me of what I love in the real thing).
BTW, I know another member here had MBL speakers that he replaced with Joseph Pulsars, happily. I had MBL 121s for many years and I had to sell them to get the Joseph Perspectives, and I find the Joseph speakers a very nice exchange, giving me much of what I loved about the MBLs, but some more conventionally pleasing aspects as well.