To the OP: Your logic seems good, but I think there are too many variables in each one's system, room, and hearing to draw any conclusions. I was happy believing that cables were all the same until I tried a $4000 per foot cable(Okay, I couldn't resist since that was so silly above), make it $5 per foot Audioquest Type 4 speaker cable in a bulk by the foot purchase. The improvement over my stranded #12 speaker cable was noticeable, and superior. But you need speakers capable of more detail. Vintage speakers from the 70s or 80s need not apply.
