Why do you think Bi-Wiring improves the sound ?

Thank God that on that third swing Richard Vandersteen hit it out of the park in 1977 and continues to do so....

but in the end, nothing makes it into the product without.... listening to music...

OP glad to be of some help and let me know how your listening tests go

No ! Many non bi-wire speakers can be designed with an L pad in the midrange and or tweeter circuit. In the Vandersteen 2 and 3 they are very carefully deployed with a very high quality device that should not be used frequently as one might a tone control. The range is significantly less than available via most tone controls. You can read more by downloading a manual from the Vandersteen website.

finally, at least for Vandersteen IF you wish to preserve time and phase, do NOT use a different wire for the two legs of the Biwire!!!
a notable exception is the new Audioquest wire that has the RF trap on the bass.

have fun, enjoy the music

Here's my short take on this:

Amplifiers are more susceptible to impedance variations than we think, even in solid state.  I think we are hearing these changes, and when you bi-wire you, perhaps to a very small amount, are changing R, L and C.

Now, the question, _if_ I am correct, and _if_ it makes a difference, is this small change worth $5?  I have no idea, but have you thought about room acoustics??  ;-)

When I build bi-wire terminals on speakers, it is only with bi-amping in mind.  Why would you add 8ft of speaker wire, rather than 3 inches in the crossover?  

FYI, whenever these discussions come up I think of MIT cables, who put crossover components into their little black boxes.  Clearly, a little inductance and capacitance in the cables seems to have sold many a listener.