Biwire with different cables?

I think that the fact that you will be biwiring will make much more of a difference in improving bass tightness than the type of wire you choose to do it with (assuming, of course, that the gauge is adequate).

In bi-wired configuration, back-emf from the woofer is conducted exclusively back to the amplifier output, where it is effectively damped by the amplifier's low output impedance. In non-biwired configuration, some fraction of the back-emf generated by the woofer is conducted through the jumpers to the terminals for the mid/hi frequency drivers, where it is less effectively damped due to the higher impedance presented by those drivers, and more significantly, some fraction of that back-emf will cause extraneous sound to be produced by the mid-frequency driver, resulting in muddied bass.

So I don't think that there is any point in spending huge $ on silver cables, even though as you probably realize they have lower resistance/better conductivity than copper (for equal gauge and length). And conceivably having different cable types for the two runs could negatively impact overall coherence.

Regards,
-- Al

When I wrote the preceding post, obviously I overlooked your statement that you are already bi-wiring, with Anti-Cables. Given that, I have no particular suggestions beyond the thought that I would be hesitant to invest in silver cables (or other expensive cables), at least without having return privileges. And I think that Stan has made some suggestions which seem well worth trying.

Regards,
-- Al