Jumper Cables - use the stock or should they be upgraded ?

Wilson Benesch Square 5's and bi-wiring is not required...now back to the question friends

For a pair of speakers of that quality, biwire all day long, twice on Sundays!!  Pick up a couple pair of quality solid core speaker cables and get out of the speakers all they can give. The owner's manual for the Square 5 Does discuss the virtues of biwiring.

I was just researching this on the web last night. I found the argument made by
electrical engineers and some speaker designer the most convincing; they basically claim that the contact point at the provided jumper measures an extremely low resistance compared to the xft of cable and mostly speaker, and the 3in long body of the jumper measures even less. They conclude by saying that trying to improve a speaker performance by changing jumpers is a little bit like trying to improve the aerodynamics of a turtle. I prefer the manufacturer’s jumpers as they look neater than my 3in/10awg ofc copper conductors.

I would never have believed it, but changing the jumpers may change the sound. When I had my Harbeth SHL5's, changing to Audience AU24 jumpers cleaned up the somewhat boomy bottom end I was experiencing and made the bass pitches much more defined.  But different isn't always better, so I would suggest trying some aftermarket jumpers and seeing if they improve the sound to your liking.  BTW, when I had my Opera Callas speakers, the aftermarket jumpers rendered no improvement whatsoever.  So that pretty much sums it up, IMO.