can you decribe how to hook it up.??
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According to my analysis, any biwire improvement is due to the returns being separated, so it might make sense to leave the jumper on the High terminals only. That is oposite to what you describe. (I assume that the crossover is implemented on the High side of the drivers. It could be done the other way around).
If you want to investigate further, try long runs of #18 speaker wires, and you might hear something.
This is how I made the connection. My speakers have four binding posts: High, positive and negative and Low, positive and negative. What I did was leave the jumper attached to the negative posts. They in effect joined the negative posts. I attached the biwire cables as normal.
It was a big improvement. The sound was more detailed but also smoother. I took the jumper off a few times to make sure I was hearing an improvement. My conclusion is the jumper stays.
Do you guys ever read input by Jon Risch over on AA Cable Asylum? He is a regular poster and fairly knowledgeable/helpful about things related to cables, room treatment, and other topics. This link, and the related follow-ups on AA, may clear up some of your questions about the negative ground hookup.