I have to agree with Hifial. In my experience two sets of speaker cables have sounded better than one set used in conjunction with jumpers. I have also found that tri-wiring with 3 sets of speaker cables have sounded better than one bi-wire set with another single set of speaker cables.
The least effective sound has been with a single set of speaker cables and a factory set of "solid" jumper brackets (not Cable jumpers).
The next best sound was with one set of speaker cables with short matching speaker cable jumpers.
Bi-wired cables probably fit right around here depending on their design, as well as the speaker design. I don' t like the bi-wired Cable option as much, because it doesn't leave me with a logical upgrade path to have 2 matching sets of speaker cables down the road, and the bi-wired set may not be needed with my next pair of speakers.
The best sound in my experience was with 2 matching sets of speaker cables. It improves the overall presentation, things like; sound-staging, imaging, transparency, resolution and air. The improvements aren't incredible but they are there. Currently, I'm using one set of speaker cables with matching jumpers and I will add a matching set down the road, when funds allow it.
I would buy the Best single pair of cables that you like and use a set of matching cable jumpers and then you will have a nice upgrade path for adding a matching set of the same cables down the road if you so choose.
4 meters is kind of long (expensive), ouch!!
Why don't you rearrange your system and put your amp in between your speakers?
Rich