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

Though I am not familiar with the Square 5s I am familiar with Wilson Benesch and they are a company that is all about the details. If they supplied jumpers then they must think that they are good enough to represent their name. I would not make this statement about most speaker manufacturers but WB is a particularly dedicated company. I would try putting the speaker cables on the high/mid posts and jumpers to the bass posts. However, we all love to experiment and different jumpers or bi-wiring may end up being your preference.

chrisr said....." is there a SINGLE speaker manufacturer advocating changing the provided jumpers?"

Well...yes... as a matter of fact,there is...Heres one. And there are probably many more...

From my Sonus faber speaker manual...

BI-WIRING
This type of connection improves the general reproduction quality, and in particular the bass frequencies. This requires two pairs of speaker cables used in the following manner: remove the connections between the terminals (bridges) ( g.11), connect each pair of terminals (high and low frequencies) independently to the amplifer as shown in g.12.

Actually, the question was not about the benefits of bi-wiring, it was about benefits of replacing the jumpers.

Yes upgrade them soon will improve your sound.

Everything matters