Kevin, in case you haven't seen it (or don't know about DR), Danny Richie's latest GR Research Tech Talk Tuesday YouTube video is the first in his new series dedicated to open baffle loudspeakers. In this episode he mentions Clayton Shaw and his Spatial Audio speakers, including them in his list of speaker makers who produce good sound at hi-fi shows (Danny used to regularly display at RMAF).
As he says in this video, future episodes will have Danny going into deep detail on the design of OB's, both full range and subs. Oughta be great!