Links to a couple of sites that had some discussion of the topic. I found both helpful. Do that copy & paste thing.
http://www.vandersteen.com/pages/Answr7.htm
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/biwire/Page1.html
http://www.vandersteen.com/pages/Answr7.htm
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/audio/biwire/Page1.html