So I just bought another pair of these. Is it just me, or are the new batches of SHE3590s a lot more bass-light than before? Sure the level of detail and sub-bass is there but the mid-bass seems to have been toned down. My pair is sibilant as well. A very different signature from my first pair. I can't compare directly though, since my old pair is busted, so I'm speaking from memory.. Does the pair need burn-in or something?
Burn-in will help