The WEL interconnect has a much blacker background, a lot more body and the bass is way more punchier than what you hear with the WBY. It also has better dynamic capabilities and amazing textures being tonally richer... The WBY is a tad thinner and airier while the WEL sounds just rock solidly dense, textured and large. The WBY is one hell of a cable but if you can stretch more, go for the WEL.
