@audiosens - I have tied a few different jumper recipes and also exchanged emails with a fellow DIYer in Europe, who performed even more extensive tests. Here's what I settled on...
- the jumpers are 20" long - that was the optimum length he believed provided the best sound
- the jumpers are made from 2 x 18 gauge solid UP-OCC copper wire - you can use UP-OCC silver, but it is NOT a night and day difference - at least on my system
- each wire strand is in its own oversized Teflon tube
- the internal diameter of the tube is 25% larger than the outside diemeter of the wire
- this basically provides about 95% air gap around the wire, which minimizes the value of Dielectric Constant to a value very close to that of AIR
- this improves greatly the clarity and details
- the two wires are twisted together - one twist every 3"-4"
- each wire strand is in its own oversized Teflon tube
- they attach to the speakers using KLE Innovations Banana plugs
- I have tried other connectors (banana and spade) and bare wire connections and these banana plugs outperformed each method by a considerable margin.
I get my UP-OCC hookup wire and other supplies from Parts Connexion
If interested - I also build my own DIY speaker cables - the construction details can be found here
- Helix Speaker Cables
- and here is what other member think of them
Hope that helps - Steve