Bi wire is not better as bluenose stated i went from double run of Audioquest midnight to single run with jumpers and then to single wire.The sound is best with single wire.Speak to a speaker MFG he will tell you where its at.There are many high end speakers that come single wire and the designers will tell you they sound best this way.
If you must jumper,use a piece of the same cable as your main speaker cable.
If you must jumper,use a piece of the same cable as your main speaker cable.