Do you guys ever read input by Jon Risch over on AA Cable Asylum? He is a regular poster and fairly knowledgeable/helpful about things related to cables, room treatment, and other topics. This link, and the related follow-ups on AA, may clear up some of your questions about the negative ground hookup.
http://java.audioasylum.com/cgi/m.pl?forum=cables&n=13441&highlight=bi-wire+tweak+jon+risch&r=&session=
http://java.audioasylum.com/cgi/m.pl?forum=cables&n=13441&highlight=bi-wire+tweak+jon+risch&r=&session=