here we go again :
http://www.audiophonics.fr/davis-acoustics-20de8-220mm-p-7964.html?osCsid=cc07e107fde2fcee77e349a13c888778http://www.toutlehautparleur.com/images/Davis_Acoustics/20DE8_Stereo_Image_N54.pdfas Gerry said, the DIY preferred option is in an open baffle design, but that"s not really WAF compatible... Davis is kind enough to provide DIYers with the internal sketches of its MV One speaker (10 Kilobucks a pair), so that I built one over a couple of weeks. It"s a complex bass reflex with an internal wave guide, kind of larguish (100x50x30 cm), with no filter at all.
link to the MV Ones :
http://www.davis-acoustics.com/en/dream/mv-one/sounded bloody beautifull with my beepre and CODA S12 amp, with the best ever midrange i've had, pleasently rounded highs (starts rolling down around 12khz, but not to steeply). Bettering the bliss I had with my Maggies 1.6, almost as fast, but a much more satisfying bottom/lower mids, and infinitely better than my ML Quests (never could get used to the mix of emitters).
Two caveats : a bit weak in the bottom end, and, it's not the speakers fault, a diffilcult listening room in a basement (highly reflective, a spiral stairway in the middle that replicates a perfect horn, low ceiling).
In total contradiction with the spirit of the beepre, I got a DSpeaker Antimode 2.0 and a BW PV1D sub, and spent some time to integrate the sub in an almost inaudible way to get a flat 20-80 curve in REW(above that, the Davis is just perfectly flat to 12khz, except for a few bumps and dips due to room resonnance... and the DSP can give a nudge).
so, finally, in a bizarre steampunk kind of way, I got this DHT pre, class A mosfet amp, pure digit DSP, full range speaker combo to sound like milk&honey.