I'm using Ultralink and couldn't hear any difference from Kimber's product. A lot cheaper. It has all the point nines and is really smooth and fast.
See
http://www.ultralinkcables.com/?#/products/compare/POWERED%20SUBWOOFER%20CABLES/)
See
http://www.ultralinkcables.com/?#/products/compare/POWERED%20SUBWOOFER%20CABLES/)