Paul Folbrecht seems to be selling a pair of Beauhorn Virtuosos on Audiogon right now.
http://cgi.audiogon.com/cgi-bin/auc.pl?spkrfull&1233453917While not the B2s, he may have some insight. In fact, he's also been trying to sell some Lamhorns, so for all I know he has some Beauhorn B2s stashed away somewhere. Hopefully he'll pop in sometime.
Chad