I run two separate sets of speaker cables to biwire my speakers. (Rather than true biwired cables as you described). Having two sets of binding posts on my amps makes it slightly easier to tighten the spades down properly. But other than that, there does not really appear to be any benefit as Kal has stated.
(However, one benefit of running two sets of speaker cables, as I have done, is that I can sell them separately, (when and if the time comes), which should make them easier to sell. But then again, it did make it slightly more difficult to buy them used! But I did manage to buy two identical sets of speaker wire, the exact same length.)
(However, one benefit of running two sets of speaker cables, as I have done, is that I can sell them separately, (when and if the time comes), which should make them easier to sell. But then again, it did make it slightly more difficult to buy them used! But I did manage to buy two identical sets of speaker wire, the exact same length.)