I'm adding Jupper cables and your opinion is ??

JD and the others have made some excellent comments, but I would put it a bit differently:

1)There is no well-established technical reason why the wire type used for the short jumper between bi-wire terminals on a speaker will make any difference sonically, assuming the gauge is adequate and good contact is made.

2)Bi-wire vs. single-wire plus jumper can certainly make a difference in many systems, although subjectively the difference may not necessarily be for the better. See the following threads in which people reported an apparent loss in bass when bi-wiring, for which I provided what I believe to be the correct explanation near the end of each thread:

http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1247016622

http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1247245568

And here is some general background on biwiring and its potential benefits:

http://www.brilliancehifi.co.uk/how-to-bi-wire-speakers.htm

Regards,
-- Al

I strongly disagree with your point (1), remembering the difference between using the bar-type jumper that ProAc supplied with my Response 3s and the foil jumpers from Mapleshade when I was using their cables. I'm not one of those who speak of jaw-dropping differences, but this was something else. I went back and forth between the supplied jumpers and the foil, not believing what I was hearing.

Dave -- I didn't say that perceivable differences would not ever occur, I said that "there is no well-established technical reason" why there should be a difference. A consequence of that being that any possible differences are unlikely to be predictable or consistent across different systems. I should have expressed that more fully in my previous post.

Regards,
-- Al

When you consider just inside of the binding post is whatever type of hookup wire the speaker designer chose to utilize, it is harder to imagine a 6 to 8 inch jumper wire making a huge difference as long as the gauge is adequate. Al is correct, there is a whole bunch of info available here on bi-wiring. Based on your statement regarding a double run, "a price tag of the cable that I'm looking at of about $16,000," I assume the cables you are considering are about $8K per pair. At that level, and considering the quality of your Avalon's, I would probably obtain a pair of the cable manufacturer's own jumpers to be sure you are achieving everything you should be sonically.