Does the"quality" of jumpers affect the sound?

I'm pretty sure every manufacturer that offers their speaker in a biwire version believes it absolutely makes a difference. Otherwise, why would they spend the extra money?

I wouldn't be so sure. I think many do it because it's "expected".

Two quick comments:

1) If the quality of the jumpers do not matter, there sure are many high-end speaker manufacturers who seem to supply high-quality ones, enough to imply that it does make a difference.

2) Best results so far for me: I use bare wire on the speaker end, and strip the wire jacket 2 inches and use the SAME wire to connect both ends.

Cheers!

Tvad- Wiring into the upper post and jumping to the bottom is something I've been doing (and suggesting) for quite a while also from recommendations by Tannoy and Stuart Marcus (Vampire Wire). It's good to hear others using this technique.

I think the only way is to wire to the top and jumper to the bottom. The highs are much more sensitive than the bass so it makes sense.

Arthur