Recommendation for an audiophile speaker cord that is not "bright"?

A friend has loaned me the Nordost Valhalla I and II as well as Nordost Frey 2 cables. They are wonderful speaker cables but do emphasize the "brightness" of my system including my Wilson audio Sahsa 2 speakers.

Any suggestions? Would used Transparent cables provide a richer bottom end? What about Audience Reference?

Any recommendations would be greatly appreciated. - Thank you - Gerry