Bi-wires links for speakers ?

Personally I DO NOT believe that bi-wiring can make any difference if  someone really wants to improve the sound he should bi-amplifying 

If you want a definitive answer, why don't you contact ProAc? They built the damned thing. 

Before we go crazy over 4 inches of wire, try pulling the plate off the speaker. You may be surprised at the rather pedestrian wire that runs from the terminal to the speaker elements. Several feet in larger speakers.  And in the crossover circuits there are caps and resistors that have tin leads that are an inch long on either side of the component. And coils that are who knows how many feet of plain copper wire rolled up. And in some the signal path runs through circuit board traces. So, how is replacing 4 inches of wire on the outside going to improve anything?   if you hear a difference it could only be subtractive, because there is no way to overcome these internal shortcomings. It may sound different, but not better. And that Gentlemen is My humble opinion. 

Just curious, has anyone noted directionality rearing its ugly head for bi-wire links? Are any specialty jumpers marked with arrows?

Alpha-gt good point, why I rewire my norh 9.0 speaker with siltech, jumpers do have different sound on every system.