http://www.audioasylum.com/audio/tweaks/messages/110806.html
I guess the premise is that having a common ground reference point at the speaker instead of back to the amp increases the coherency and reduces diffusion? Anyway, it seems reasonable. Here are snippets from some experimentors:
"The traditional biwire has a bit more sparkle, and slightly meaner, leaner bass. Traditional also has better imaging, with the instruments more separated along with a better perception of depth.
The tweaked setup is a tad more dull with the instruments grouped more tightly together. The bass is not as lean and mean, but the fullness may be quite welcome in some systems. Overall, there is a better sense of coherence to the music (it's probably due to the type of recordings I tend to listen to - mostly moderate rock where all tracks are recorded individually and each track often has slightly different ambience), but it is a strage effect to try to describe. Even though I describe the tweaked setup as having more coherence, I would not call it more musical than the traditional setup. "
Here's another:
"a more relaxed sound quality, a more coherent, flowing sound to the music, a more natural soundstage. The presentation is "less hifi" (for lack of a better way to put it!), and things sound more... "natural", to me. Try it, you might like it... "
And a third:
"That is because with fully isolated bi-wiring, the ground reference point for each crossover section is all the way back at the amp terminals through the seperate speaker cables, and connecting a jumper (not necessarily the oringal brass POS jumper that came with the speakers either, a bare solid copper wires often works better.) between the two ground terminals asures that each section sees the same ground reference point, as it has been commoned at the speaker, and the impedance back to the amp halved.
See also:
All about bi-wiring, the hows and whys
http://www.geocities.com/jonrisch/biwiring.htm
AND
http://www.geocities.com/jonrisch/biwiring2.htm
http://www.geocities.com/jonrisch/biwiring3.htm
and
Latest Flash on bi-wiring:
http://www.AudioAsylum.com/audio/cables/messages/13441.html
for more info re this subject."
