I think that clearly the way to go is to use a specific cable for the positive speaker post and, after testing several dozen cables in this case, a different brand and type for the negative wire. Repeat this for biwiring and you should wind up with two to four disparate wire types for each speaker. Also try each reversed to make sure they were branded for directivity properly...this entire operation should take about 6 weeks but the results can be amazing, or simply a complete waste of time.
