That is the point of why I started this thread, that people keep upgrading components when the actual issue is often hidden by low grade cables.
It's sometimes easier to shop for other gear (the watts are listed on a receiver along with the features) or a speaker (sensitivity, frequency range, is listed etc). Where do you start the process shopping for a neutral cable? The specs aren't generally published and if they were, how does a neutral cable measure and what should a consumer be looking for? If my speakers are 4 ohms right away it helps me shop for a matching amp for example. I have had to learn just by reading reviews and trying new cables. I hear about different types of copper, silver, gold plated interconnects, etc. How do you know where to begin shopping for neutral? You are right, this is a big problem and I think it's why so many people are skeptical about different types of cables. Any thoughts?
In my home theater system the biggest bottle neck was the digital cable. Everything flows down stream from there and unless you get that right how can you hear what is actually coming from your source? So many people are using really bad optical cables these days and they spend $$$ on new processors and DAC's looking for an upgrade they will never really get 100% because of the bottle neck from the source to the DAC or processor.
Yup, digital cables are often a problem, plastic optical cables aren't good and coax S/PDIF or AES/EBU cables are uniformly bad. I offer a litz-type S/PDIF which has been preferred over every other S/PDIF cable it's ever been compared to.
As far as what's a neutral cable and how to figure out what's what, I have no good ideas but it is a problem. I have some customers that look at the materials and connectors I use and know what they are getting, these people are usually very experienced and generally have a good idea of what my cables will sound like before they buy them. But this is rare and most people don't know what they are shopping for, I assume it's word of mouth and reviews that prompt people to consider certain cables.
What I'd say is that UPOCC silver is the best commonly available conductor material we have available, my OCC silver/gold alloy is even better of course

...but not exactly common. I've heard good copper IC cables like $5k+ Jorma are excellent cables but still not close to the resolution of UPOCC silver. Generally, if you have copper IC cables you can do much better but UPOCC silver is the only type of silver wire that does not introduce other problems and pure silver tends to be a bit lightweight on timbre, so some would say not natural sounding and I'd agree. Some compensate by using large gauges, Wireworld and Siltech use 17g UPOCC silver for their totl IC cables which is huge overkill. I add some gold, which produces a very realistic timbre compared to pure silver but it cost a lot more than pure UPOCC silver, which is already exceptionally expensive.
What's even worse is people who think cables should be tone controls, this is a really bad idea! While ultimately "synergy" is most important, synergy doesn't apply to truly neutral components, they will work well in any system. My DD cable using Duelund silver is purposly "voiced" (it's the only one I have that is not as neutral as possible) and the results are unpredictable, love-it/hate-it kind of cable. OTOH, my D4 is exceptionally neutral and works in every system it's tried in. The only people that may not love it are folks that want a very warm sound.