So I finally got my replacement pair of SE846's and I've gotta say these sound way better than the defective one's I sent back. Even though 1 earbud was dead on them, I didn't get any impression they would sound this good. I am only using an iPhone 5 to drive them right now too, with mp3's so once I get the FIIO X5 and load some of hi-res HDTracks music on them I can only imagine how much better they will sound. Very happy Shure finally got around to sending me a new pair (build date 2/11/14), though I still think it's pretty lame to make me pay for shipping for headphones that are DOA, oh well, hopefully they will hold up this time and not break in a few weeks.
Good to know all went well.