Thanks everyone for the feedback, especially @ebm @louisl @ dinov. That was useful advice.
@ddrave44 , I was frankly not happy with either of the Siltechs. I ultimately went with Silversmith Audio Fidelium speaker cable. Out of the box, I knew that they were the ones that I would keep. It just boggles the mind that the cheaper cables (i.e. the Silversmith) won out over the Siltechs. However, I only returned the Legend 380i to my dealer. I have kept the 680i. It is now happily installed on my study system ( https://systems.audiogon.com/systems/9671).
I do intend to swap them at some point in the future and with the Silversmith Audio Fidelium speaker cables and see whether I prefer their sound on my main system ( https://systems.audiogon.com/systems/9619). This is the experimentation that keeps some of us audiophiles happy :-)