Hook the speaker cables to the woofers and the jumpers to the high frequency drivers. You can us a higher gauge wire for the jumpers if you like. If you are using 10 gauge on the woofers use 12 gauge for the high frequency drivers. Does any of this make a difference? No, not at all. Listen for yourself. Switch the wires around and experiment. You will not hurt anything. The instruction I gave above is convention and theoretically the right way to do it as the woofers usually demand more current.
HOW CRITICAL ARE JUMPER CABLES
When using jumper cables instead of biwire speaker cables, do the jumpers need to be as good a quality or better than the actual quality of the speaker wires? The jumpers need to be 6” to 9” long. Also is it better to hook the main speaker wires to the low end and then run the jumpers to the high end or visa versa?