Those Tempesta's looked interesting, but I don't see the point of a small midrange with a 7" woofer ... shouldn't the 7" woofer be able to reach up to the bottom end of the tweete without problem? In talking with Rick it seemed like he only decided to use that small Accuton because it has it's own sealed cup, and doesn't need it's own chamber in the cabinet ... which makes it compatable with those pre-fab cabinets he's using. So basically the limiations of his cabinets decided what drivers he could use, which seems backward to me.
I'm also not a fan of very small midrange drivers, I've heard hundreds over the years with 4" woofers all the way down to 2" dome midranges, and they all lack scale and weight to vocals. Yes they can sound very clean and accurate, but they don't convey a sense of power.