I have always thought jumper down is the correct method, I cannot see where the reverse would be better.
For optimum results, get a second set of speaker cables. I used to use two sets in years past and it easily outperformed the jumpers I tried. The jumpers were just some heavy gauge speaker wire, I forget what gauge. (I used Cardas Quadlink for highs and Audio Quest Midnight for lows)
I am currently using jumpers though. They are JPS SC2 jumpers. Another company to consider for jumpers is WBT. www.wbtusa.com
For optimum results, get a second set of speaker cables. I used to use two sets in years past and it easily outperformed the jumpers I tried. The jumpers were just some heavy gauge speaker wire, I forget what gauge. (I used Cardas Quadlink for highs and Audio Quest Midnight for lows)
I am currently using jumpers though. They are JPS SC2 jumpers. Another company to consider for jumpers is WBT. www.wbtusa.com