Why do you think Bi-Wiring improves the sound ?

^^^^ typical post of someone reading the title and inserting their 0¢.

'Good' speaker wire is meaningless. The cable is part of a system and $$$ is often sonically and measurably worse than ¢¢¢.

If you want to know, there are plenty of well written papers explaining the electrical theory. See  http://www.ielogical.com/Audio/CableSnakeOil.php

@ieales    
Thank You for the link, I read it yesterday , very interesting .

The question is does it improve the sound ?
i.e. does the sound stage increase , get deeper , do you have more of a 3D effect , is the music clearer or sharper ?
I asked the question because I can't
( as a retired biomedical equipment technician ) grasp why it seems to sound better to many who have tried it
( without increasing the overall awg ) ,
but I had the same feeling about power cords and outlets until 
I tested and heard the improvements so I am curious about bi-wiring .

As for Glenlivet , I prefer Glenfarclas .

@ieales " ^^^^ typical post of someone reading the title and inserting their 0¢.

'Good' speaker wire is meaningless. The cable is part of a system and $$$ is often sonically and measurably worse than ¢¢¢."

I've been called many things but "typical" is not one of them. A first!
I don't understand your second and third sentences quoted above. 
Please educate me. 

Lastly, in the spirit of banter, by "good" I mean that the owner of the rig
and cables thinks they are "good" and I don't see how that is meaningless. 

Funny, I feel the same about people who link to their blogs to appear erudite but then make fundamental errors or overly simplified generalizations that result in the wrong conclusion most of the time ... Hint, is the emitter resistor in the feedback or not?

^^^^ typical post of someone reading the title and inserting their 0¢.

Let's face no one knows why bi-wiring improves sound quality. Not one single credible explanation offered so far. 

Some consumers (and importantly also reviewers) seem to believe that it does, and prefer to buy loudspeakers which provide this option. Some manufacturers may therefore feel compelled to provide this option due entirely to these marketing pressures and little else.

On the other hand many believe it doesn't - including those manufacturers who on principle don't even feel it relevant enough to allow their users the opportunity to try it out.

Some might even be of the opinion that bi-wiring actually makes the sound worse.

Cable manufacturers and dealers on the other hand....