I do find it entertaining how people are constantly flooding Audeze threads either demanding they build a headphone that sounds like another brand's headphone, or at the least, are disappointed that they don't.
I'm sure glad my LCD4s sound the way they do, if they didn't sound the way they did, I wouldn't have bought them, or at least, wouldn't have kept them.
I heard a pair of LCDXs, I thought they sounded quite a bit different from what I thought Audeze cans "should" sound like. Heard LCD3s next, thought those were much better. Then I heard my LCD4s, and they were almost exactly perfect.
Maybe I'm a bit more sensitive than most, but I cannot stand harshness, hardness, brightness, shriekiness, shrillness, metallic-ness, sibilance, or anything like any of these things in even the smallest degree in any way. I can still hear to 17 kHz, and generally have extremely sensitive hearing, I think. I can't imagine needing more upper-mid/lower treble than I get out of my LCD4s right now. Any weakness that may be in my current setup probably comes from my Mimby, but frankly, I'm pretty happy with these 2 components and my Pro iCan. Quite a good combination. I can't imagine needing any additional brightness or detail, frankly I almost never run my iCan in SS mode, almost always use the tubes.