I don't know about the particular Siltech cables you are looking at, but, I would like t comment on the notion that there is a "typical silver sound" and that this sound is either bright or edgy or hard. I have heard cables made out of all sorts of material and all kinds of configurations and you can find hard and bright sound, or the opposite, with any material or form of construction.
Most of the silver cables I've heard sound clear and smooth and do not impart an artificial edge or add a sibilant quality. But, even these cables may do just that in another system, so it is really a matter of actually trying various candidate cables.
Most of the silver cables I've heard sound clear and smooth and do not impart an artificial edge or add a sibilant quality. But, even these cables may do just that in another system, so it is really a matter of actually trying various candidate cables.