09-05-15: MikirobRob, for my thoughts on why a high degree of correlation between cable performance and cable price should not be expected, see my posts here and here, and in the links provided therein.
It is astounding to me that the about $15,000 Tara Labs speaker cable can be compared to the about $80 WE16ga speaker cable in the same breath, with the WE16ga comparing so close, so favorably, to most if not all the vaunted speaker wires; and perhaps the WE betters those vaunted wires in certain categories such as musicality, if not in overall performance. At any rate it is close, neck and neck.
While the findings you and the others have reported about the WE and Belden cables are certainly a wonderful and valuable discovery, IMO they are not at all surprising.
Enjoy! Best regards,
-- Al