to bi-wire or not?

Ghosthouse is correct.  Chris was the one who got me to try this using his jumpers, and in my system it was all positive.  Just shows how this cable stuff is really so system dependent.  I too thought biwiring required removing jumpers, but that's not the case.  In my setup I have shotgun biwire cables with spades, so my jumpers are terminated with bananas and bridge the lower and upper positive terminals and same for negative -- just to be clear on how this works.  At the very least it's a cheap and easy tweak to try, and if it works you won't listen without them anymore. 

 Thanks so much for the suggestion – I never would’ve thought of trying  jumpers with bi-wiring!    I will need to wait for my new shotgun cables to break in before trying the jumpers as well.   I have good quality jumpers but not on the level of the Acoustic Zen Satori cables.  The folks at Acoustic Zen tell me that they do offer Satori jumpers though......

Just in case clarification is called for, I was definitely not trying to contradict soix experience of bi-wiring with jumpers still in place.  The only way to know for sure is try it for yourself.  

passive biamping is more noticeable then bi-wiring because usually amplifier are more nonlinear than wires.
However it is a matter of fact (Ohom's law) that in both approach
the current is divided; high freq. current flows in one mean (cable or amp) and the low freq. current flows in the other.
If the wires were perfect then there would be no difference. but if wires distort then bi-wiring decreases intermodulation between high freq. and low freq. signals.   So it is more plausible that biwiring is more audible with low quality cables. In other words. biwiring is more effective with low quality cables. An amplifier is much more non linear that a cable so biamping (passive) effects is by far more audible that biwiring. Those who hear difference between cables are likely to hear also differences when they bi-wire their system.