Tplavas, the wall plug used on the SLVR is a silver plated Pass & Seymour extra-hard use spec grade unit, not hospital grade, while the IEC plug is a silver plated Schurter, I believe. Bob Crump spent many years comparing many devices and taking detailed notes, until he found the ones he liked best...he had a garage full of stuff that didn't work. That's not to say others may have other preferences in voicing, but my point is it takes a long time to find what works best, and the termination and other materials all affect the sound.
Brian
Brian