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

What speakers do you have?  Does the manufacturer suggest biwiring?

Upgrade the jumpers it's a relatively cheap upgrade that's a significant sonic improvement if you don't intend to bi-wire.

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.