Check out Magnan speaker cables. This company has came out with a concept of multiple wires smaller than a human hair, in a flat-shaped cable. They sound pretty amazing and extremly neutral. For those looking for solid copper speaker cable I would recommend WhyNot speaker cables which are probably the best on the market. Both concepts have advantages and inconveniences and system matching is always an issue. To solve your dilemma, you should test both in your system and decide which one to keep.
Solid copper or stranded copper for speaker cables? What is your choice and why?
I had old copper speaker cable made by Audioquest (don't know the model). The cable contains only two solid copper wires, one is thicker than the other. As I recalled, Audioquest claimed back then that thicker wire primarily carries lower frequency signal and the thinner wire is responsible for the rest. I actually have not seen this type of design nowadays, BUT when listening and comparing it with the stranded wire (either 12 or 10 gauge) cable, I found the dynamic range is greater, and the bass is tighter and has more weight. What do you think?