I have a pair of original Auratones from the 1970's and still use them always in mixdown and reference mix comparisons (though that's rarely, nowadays). I had to re-foam them a few years ago, the original Auratones like mine had a roll surround and did not exhibit so much of the nasty upper mid/low hf of these Avantones -- speakers which I would avoid.
I have not read every post, but I suspect there's a bit of mis-understanding going on about this class of monitors. I'm confident they were originally introduced to replace the grot-box, but mixers rapidly grasped that they forced concentration on the essential mid-frequencies of the mix, and encouraged precise balancing in that area, oddly, including ensuring that bass and bass drum balance is adequate on band-limited playback systems, Once that is all alright, then you turn them off and use better monitors to deal with the ends of the spectrum (while still checking on them).
As to why use them instead of, say, bandpass filters or some form of emulation, well people get used to what material sounds like and should sound like on their equipment, plus you could stick'em in a bag and take them to another studio with ease. They also have startlingly good imaging and no port!
Myself, I prefer my originals to any of the reissued Auratones, and did not like any of the substitutes offered by other manufacturers.
There’s contemporary frequency responses of a re-issue of the original Auratones (brighter with a peak) at:
Also comparative reviews of the originals, more recent reissues and Avantones at:
Do note the 1/6th 8ve smoothing.
Behringer also did a soundcube and I recall a couple of others, none of which ever tempted me. There's a review of those explaining why they are not utterly awful, and Auratones are useful, at:
Behringer’s take on the classic Auratones won’t break the bank — but will they help you make those crucial mix-balancing decisions?
In any case, improvements to overall frequency response are not the point here, the restrictions on it are what is important, much as with the truly awful (but very useful) Yamaha NS-10s, which replaced many of these. If you want good balanced monitors, Auratones are not they! And these, even less so.