Any real differences between (the much raved about) QED Silver Anniversary XT and the Chord Carnival Silver Bi-Wire Speaker Cables? I know that the QED's are not biwirable, but I have read some good reviews on these cables. As my Speakers (B&W) accept biwirable cables, was also wondering if the Chord would be a more sensible option. I could of course, also use 2 lengths of the QED cable with each speaker if these cables are better. Thanks for the advice....