Anyone who might be interested in a set of Danny Richie's OB-7 open baffle speakers should check out this thread over at the GR Research forum: http://www.audiocircle.com/index.php?topic=130208.0
I built these myself a few years back. Nice looking units. Solid mahogany front baffle. You'll need a passive crossover which I'm sure Danny can supply. They were tri-amped with external crossovers.