I just went and looked at the Jon Risch link above, and while he has some good points, it is very oversimplified and doesn't acknowledge any of the limitations of biwiring, namely:
(1) the obvious potential for intentional and unintentional response "tweaking" that will occur using two cables rather than one, and especially two different cables (which seems to be what he is suggesting, although he doesn't come right out and say it). This can be either better or worse than the performance you would get from a single wire, depending more on random chance than anything else given the complexity of most crossovers. I'm not against tweaking the sound with cables; I just think that you ought to be honest about what you are doing.
(2) Even more important, the fact that biwiring will automatically and by default restrict the crossover design itself to a true parallel type. This in itself and all by itself is way more than enough reason to give up biwiring, in order to have the flexibility in crossover design to pursue series alignments or any number of more complex schemes.
There are a lot of pseudo-"experts" out there, and quite often I find that I am honestly not satisfied with their answers to complex technical problems; they seem to latch onto an "answer" without having adequate technical proof of the superiority of this answer. Biwiring is not necessarily a bad thing, and it is not necessarily a good thing. It is going to depend on the exact speaker drivers and cabinet design, the exact crossover topology and parts, the exact wire used, and even the amplifier(s)' own characteristics. This is one giant ball of issues all rolled into one, and any one of them is going to have a tremendous effect on the end result, but of all of them, the wire is probably going to affect it the least. That is why I refer back to #2 above; far better to be able to optimize the crossover properly than to be stuck in a "parallel" universe forever.
(1) the obvious potential for intentional and unintentional response "tweaking" that will occur using two cables rather than one, and especially two different cables (which seems to be what he is suggesting, although he doesn't come right out and say it). This can be either better or worse than the performance you would get from a single wire, depending more on random chance than anything else given the complexity of most crossovers. I'm not against tweaking the sound with cables; I just think that you ought to be honest about what you are doing.
(2) Even more important, the fact that biwiring will automatically and by default restrict the crossover design itself to a true parallel type. This in itself and all by itself is way more than enough reason to give up biwiring, in order to have the flexibility in crossover design to pursue series alignments or any number of more complex schemes.
There are a lot of pseudo-"experts" out there, and quite often I find that I am honestly not satisfied with their answers to complex technical problems; they seem to latch onto an "answer" without having adequate technical proof of the superiority of this answer. Biwiring is not necessarily a bad thing, and it is not necessarily a good thing. It is going to depend on the exact speaker drivers and cabinet design, the exact crossover topology and parts, the exact wire used, and even the amplifier(s)' own characteristics. This is one giant ball of issues all rolled into one, and any one of them is going to have a tremendous effect on the end result, but of all of them, the wire is probably going to affect it the least. That is why I refer back to #2 above; far better to be able to optimize the crossover properly than to be stuck in a "parallel" universe forever.