Tom
Based on what I vision a solid core wire would be more coherent than a stranded cable. A solid core will have 1 single path vs a multitude of paths of many fine wires as a group..resulting in group delay? I sold and owned Dunlavy speakers. He had his own wire that he used and appeared to be multi strand like and offset like twin lead antenna wire.
Of course Dunlavy had patents on antenna design that were used in the military.
Again you make me think of the 48 strand 8 gauge Litz.inductors used on my ribbon Tweeter. Said to have a bandwidth of nearly 40k. Other styles are said to have much lower bandwidth which may be fine for the frequency range of any given woofer or midrange. But the counter of that is any wire touching another insulated wire wound or twisted in any geometry has to interact with the intimate wire next to it I try to use the same group type of everything thing to maintain symmetry of sound and coherence..such as wire caps and inductors. Nice to hear a choir to speak with one great voice.
That's the goal for me and most others who visit here.
TomD