BassZilla information

Has anyone heard or had experience building Dick Olsher's "BassZilla" loudspeakers? These are of the high-efficiency sort (97-98 db 1w/1m) using full-range Fostex or Lowther drivers combined with a 15-inch woofer. I'm thinking these would be good for a future SE or OTL tube amp project I'm contemplating. Anyone know the impedance of these speakers?

Description is at http://www.blackdahlia.com/tipindex/BassZilla/basszilla.htm