For the most part I think many probably the vast majority of cables are purposely designed to sound a specific way in line with what the designer likes that probably have little to do with neutrality. So far as the neutrality of cables, it seems the ones I like best have smaller conducters. I don't want a "warmer, richer" sound but more accurate and natural presentation of the recording. You can't know which one is best for your application without listening to many. The best I've heard to date that offer a coherency and separation and more realistic tonal rendition of instruments and voices are the Omega Micro line particularly when used as a system. Unfortunately they are fragile and as you move up the line, thinner ribbons and less dialectric, they get more expensive but better still, the less is more approach and it is clearly audible even to cynics. THESE are very natural and have the effect in a system of a major component upgrade, at least the 4 systems I've heard them in.