Many single wires can turn your rack into a bowl of spaghetti. On the possitive side, single wires can assure that all speaker drivers are getting the proper current or grade of metal. Biwired speaker cables on the other hand split the cable down the middle. Half goes to the woofer, the other half goes to the squawker and tweeter. Since the woofer uses the most current to drive massive amounts of air, shouldn't the woofer get most of the wire mass? Tweeters are more sensitive to metal impurities and should get a better grade of metal. I'll use biwiring when cable companies realize these requirements for different drivers.